(ITS#8393) LMDB - MDB_GET_BOTH broken on non-dup value
by hyc＠openldap.org
Full_Name: Howard Chu
Version: 0.9.18
OS: Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (78.155.228.110)
Submitted by: hyc
Using mdb_cursor_get(MDB_GET_BOTH) doesn't return the data item if the record is
not a dup (i.e., there's only a single value under the key) even though it
matches.
This doesn't affect slapd because (1) when we use this command, the key always
has more than 1 value and (2) when we use it, the data item we passed in is
exactly the same as what we would get returned, on a match.
This affects other apps where both (1) and (2) are not true, e.g. a compare
function is used that only compares a subset of the data, in order to retrieve
the full record.
7 years, 8 months
Re: (ITS#8392) Opening multiple databases from the same process
by matthew＠wellquite.org
Fixed. The short version is it's definitely a problem of my own making,
though it's not related to threading. It's an oversight in the design of
my own bindings which only causes an issue when you open multiple
databases at the same time. I shall be able to fix without a problem in
my bindings.
Thank you for your help, and sorry for wasting your time.
Kind regards,
Matthew
7 years, 8 months
Re: (ITS#8392) Opening multiple databases from the same process
by matthew＠wellquite.org
--hQiwHBbRI9kgIhsi
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> One problem is that the debug output gives no indication of which thread
> is which so it seems pretty tricky to separate out the different calls.
> Do you have any hints or tricks for doing this?
Ok, so I altered the DPRINTF so that it gets the current thread id too:
fprintf(stderr, "%s:%d:%lu " fmt "\n", mdb_func_, __LINE__, syscall(__NR_gettid), __VA_ARGS__)
I also added some DPUTS to the start of every function in the API.
New log attached. Essentially, there are four threads of interest:
7036 - write txns for /tmp/data1
7039 - read txns (incl cursor) for /tmp/data1
7040 - write txns for /tmp/data2
7041 - read txns (incl cursor) for /tmp/data2
As there are no writes going on, the write threads do no work once the
envs and dbis are created and opened.
In this run, it's 7039 that finds the usual problem. If we just grep for
7039 from the log, we get (edited highlights):
mdb_txn_begin:2860:7039 begin txn 1862r 0x7f4034000a10 on mdbenv 0xd483c0, root page 417
...
mdb_get:5570:7039 mdb_get
mdb_get:5576:7039 ===> get db 4 key [00000000000000010000000000000001311e7dc5]
...
mdb_cursor_set:6002:7039 ==> cursor placed on key [00000000000000010000000000000001311e7dc5]
mdb_txn_reset:2990:7039 mdb_txn_reset
mdb_txn_end:2919:7039 mdb_txn_end
mdb_txn_end:2931:7039 reset txn 1862r 0x7f4034000a10 on mdbenv 0xd483c0, root page 417
... now we start up /tmp/data2 in the other threads.
When we next see 7039 return:
mdb_txn_renew:2749:7039 mdb_txn_renew
mdb_txn_renew:2759:7039 renew txn 1862r 0x7f4034000a10 on mdbenv 0xd483c0, root page 417
mdb_cursor_open:7408:7039 mdb_cursor_open
mdb_page_search:5445:7039 db 1 root page 417 has flags 0x2
mdb_page_search_root:5342:7039 found leaf page 417 for key [5472616e73616374696f6e73]
mdb_node_search:5091:7039 searching 5 keys in leaf page 417
mdb_node_search:5135:7039 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5135:7039 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_page_search:5445:7039 db 4 root page 276 has flags 0x1
mdb_cursor_get:6103:7039 mdb_cursor_get
mdb_cursor_first:6011:7039 mdb_cursor_first
mdb_page_search:5445:7039 db 4 root page 276 has flags 0x1
mdb_page_search_root:5290:7039 branch page 276 has 2 keys
mdb_page_search_root:5296:7039 found index 0 to page 710
mdb_cursor_push:5202:7039 pushing page 710 on db 4 cursor 0x7f4034000bd0
mdb_page_search_root:5290:7039 branch page 710 has 134 keys
mdb_page_search_root:5296:7039 found index 0 to page 43
mdb_cursor_push:5202:7039 pushing page 43 on db 4 cursor 0x7f4034000bd0
mdb_page_search_root:5342:7039 found leaf page 43 for key [null]
... at this point the error is detected and we start tidying up.
>From the tids that are being logged, it doesn't appear to me that
anything's up with the threading. It looks like there's some issue with
opening a cursor in a read only txn that has already been reset and
renewed.
The strange thing is that this only happens when this program is running
across more than one database. With a single database it never goes
wrong. So it seems like there's some interaction between opening a
second db and an existing db (with reset txns?).
Many thanks for your time.
Matthew
--hQiwHBbRI9kgIhsi
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GoshawkDBConsistencyChecker 2016/03/26 22:24:37.798236 [./consistencychecker /tmp/data1 /tmp/data2]
GoshawkDBConsistencyChecker 2016/03/26 22:24:37.798527 ...loading from /tmp/data1
GoshawkDBConsistencyChecker 2016/03/26 22:24:37.798558 Starting disk server on /tmp/data1
mdb_env_create:3862:7036 mdb_env_create
mdb_env_open:4702:7036 mdb_env_open
mdb_env_open2:4192:7036 opened database version 1, pagesize 4096
mdb_env_open2:4193:7036 using meta page 0
mdb_env_open2:4194:7036 depth: 1
mdb_env_open2:4195:7036 entries: 5
mdb_env_open2:4196:7036 branch pages: 0
mdb_env_open2:4197:7036 leaf pages: 1
mdb_env_open2:4198:7036 overflow pages: 0
mdb_env_open2:4199:7036 root: 417
mdb_env_open:4821:7036 opened dbenv 0xd483c0
mdb_txn_begin:2767:7036 mdb_txn_begin
mdb_txn_begin:2860:7036 begin txn 1863w 0xd49660 on mdbenv 0xd483c0, root page 417
mdb_cursor_set:5812:7036 mdb_cursor_set
mdb_page_search:5445:7036 db 1 root page 417 has flags 0x2
mdb_page_search_root:5342:7036 found leaf page 417 for key [5472616e73616374696f6e52656673]
mdb_node_search:5091:7036 searching 5 keys in leaf page 417
mdb_node_search:5135:7036 found leaf index 2 [5472616e73616374696f6e52656673], rc = 0
mdb_cursor_set:6002:7036 ==> cursor placed on key [5472616e73616374696f6e52656673]
mdb_cursor_set:5812:7036 mdb_cursor_set
mdb_page_search:5445:7036 db 1 root page 417 has flags 0x2
mdb_page_search_root:5342:7036 found leaf page 417 for key [56617273]
mdb_node_search:5091:7036 searching 5 keys in leaf page 417
mdb_node_search:5135:7036 found leaf index 2 [5472616e73616374696f6e52656673], rc = 2
mdb_node_search:5135:7036 found leaf index 3 [5472616e73616374696f6e73], rc = 2
mdb_node_search:5135:7036 found leaf index 4 [56617273], rc = 0
mdb_cursor_set:6002:7036 ==> cursor placed on key [56617273]
mdb_cursor_set:5812:7036 mdb_cursor_set
mdb_page_search:5445:7036 db 1 root page 417 has flags 0x2
mdb_page_search_root:5342:7036 found leaf page 417 for key [5472616e73616374696f6e73]
mdb_node_search:5091:7036 searching 5 keys in leaf page 417
mdb_node_search:5135:7036 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5135:7036 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_cursor_set:6002:7036 ==> cursor placed on key [5472616e73616374696f6e73]
mdb_txn_commit:3361:7036 mdb_txn_commit
mdb_txn_end:2919:7036 mdb_txn_end
mdb_txn_end:2931:7036 empty-commit txn 1863w 0xd49660 on mdbenv 0xd483c0, root page 417
mdb_txn_begin:2767:7039 mdb_txn_begin
mdb_txn_begin:2860:7039 begin txn 1862r 0x7f4034000a10 on mdbenv 0xd483c0, root page 417
mdb_txn_renew:2749:7039 mdb_txn_renew
mdb_txn_abort:3004:7039 mdb_txn_abort
mdb_txn_end:2919:7039 mdb_txn_end
mdb_txn_end:2931:7039 abort txn 1862r 0x7f4034000a10 on mdbenv 0xd483c0, root page 417
mdb_txn_begin:2767:7039 mdb_txn_begin
mdb_txn_begin:2860:7039 begin txn 1862r 0x7f4034000a10 on mdbenv 0xd483c0, root page 417
mdb_get:5570:7039 mdb_get
mdb_get:5576:7039 ===> get db 3 key [0000000000000000000000000000000000000000]
mdb_page_search:5445:7039 db 1 root page 417 has flags 0x2
mdb_page_search_root:5342:7039 found leaf page 417 for key [56617273]
mdb_node_search:5091:7039 searching 5 keys in leaf page 417
mdb_node_search:5135:7039 found leaf index 2 [5472616e73616374696f6e52656673], rc = 2
mdb_node_search:5135:7039 found leaf index 3 [5472616e73616374696f6e73], rc = 2
mdb_node_search:5135:7039 found leaf index 4 [56617273], rc = 0
mdb_page_search:5445:7039 db 3 root page 471 has flags 0x1
mdb_cursor_set:5812:7039 mdb_cursor_set
mdb_page_search:5445:7039 db 3 root page 471 has flags 0x1
mdb_page_search_root:5290:7039 branch page 471 has 3 keys
mdb_page_search_root:5296:7039 found index 0 to page 628
mdb_node_search:5091:7039 searching 3 keys in branch page 471
mdb_node_search:5138:7039 found branch index 1 [000000000000011c0000000600000001311e7dc5 -> 725], rc = -1
mdb_page_search_root:5314:7039 following index 0 for key [0000000000000000000000000000000000000000]
mdb_cursor_push:5202:7039 pushing page 628 on db 3 cursor 0x7f403c27b6b0
mdb_page_search_root:5290:7039 branch page 628 has 68 keys
mdb_page_search_root:5296:7039 found index 0 to page 137
mdb_node_search:5091:7039 searching 68 keys in branch page 628
mdb_node_search:5138:7039 found branch index 34 [00000000000000780000000600000001311e7dc5 -> 138], rc = -30720
mdb_node_search:5138:7039 found branch index 17 [00000000000000220000000600000001311e7dc5 -> 88], rc = -8704
mdb_node_search:5138:7039 found branch index 8 [000000000000000e0000000600000001311e7dc5 -> 50], rc = -3584
mdb_node_search:5138:7039 found branch index 4 [00000000000000030000000500000001311e7dc5 -> 52], rc = -768
mdb_node_search:5138:7039 found branch index 2 [00000000000000010000000300000001311e7dc5 -> 1401], rc = -256
mdb_node_search:5138:7039 found branch index 1 [00000000000000000000000600000001311e7dc5 -> 983], rc = -1536
mdb_page_search_root:5314:7039 following index 0 for key [0000000000000000000000000000000000000000]
mdb_cursor_push:5202:7039 pushing page 137 on db 3 cursor 0x7f403c27b6b0
mdb_page_search_root:5342:7039 found leaf page 137 for key [0000000000000000000000000000000000000000]
mdb_node_search:5091:7039 searching 6 keys in leaf page 137
mdb_node_search:5135:7039 found leaf index 2 [000000000000000000000000000000015b297cbd], rc = -256
mdb_node_search:5135:7039 found leaf index 0 [0000000000000000000000000000000000000000], rc = 0
mdb_cursor_set:6002:7039 ==> cursor placed on key [0000000000000000000000000000000000000000]
mdb_get:5570:7039 mdb_get
mdb_get:5576:7039 ===> get db 4 key [00000000000000010000000000000001311e7dc5]
mdb_page_search:5445:7039 db 1 root page 417 has flags 0x2
mdb_page_search_root:5342:7039 found leaf page 417 for key [5472616e73616374696f6e73]
mdb_node_search:5091:7039 searching 5 keys in leaf page 417
mdb_node_search:5135:7039 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5135:7039 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_page_search:5445:7039 db 4 root page 276 has flags 0x1
mdb_cursor_set:5812:7039 mdb_cursor_set
mdb_page_search:5445:7039 db 4 root page 276 has flags 0x1
mdb_page_search_root:5290:7039 branch page 276 has 2 keys
mdb_page_search_root:5296:7039 found index 0 to page 710
mdb_node_search:5091:7039 searching 2 keys in branch page 276
mdb_node_search:5138:7039 found branch index 1 [00000000000005df00000000000000015b297cbd -> 449], rc = -5
mdb_page_search_root:5314:7039 following index 0 for key [00000000000000010000000000000001311e7dc5]
mdb_cursor_push:5202:7039 pushing page 710 on db 4 cursor 0x7f403c27b6b0
mdb_page_search_root:5290:7039 branch page 710 has 134 keys
mdb_page_search_root:5296:7039 found index 0 to page 43
mdb_node_search:5091:7039 searching 134 keys in branch page 710
mdb_node_search:5138:7039 found branch index 67 [00000000000002e10000000000000001b1f3f9b0 -> 344], rc = -2
mdb_node_search:5138:7039 found branch index 33 [00000000000000bd0000000000000001311e7dc5 -> 336], rc = -48128
mdb_node_search:5138:7039 found branch index 16 [000000000000005700000000000000015b297cbd -> 123], rc = -22016
mdb_node_search:5138:7039 found branch index 8 [000000000000001d0000000000000001311e7dc5 -> 135], rc = -7168
mdb_node_search:5138:7039 found branch index 4 [00000000000000100000000600000001311e7dc5 -> 19], rc = -3840
mdb_node_search:5138:7039 found branch index 2 [000000000000000200000000000000015b297cbd -> 109], rc = -256
mdb_node_search:5138:7039 found branch index 1 [00000000000000010000000000000001311e7dc5 -> 5], rc = 0
mdb_page_search_root:5314:7039 following index 1 for key [00000000000000010000000000000001311e7dc5]
mdb_cursor_push:5202:7039 pushing page 5 on db 4 cursor 0x7f403c27b6b0
mdb_page_search_root:5342:7039 found leaf page 5 for key [00000000000000010000000000000001311e7dc5]
mdb_node_search:5091:7039 searching 3 keys in leaf page 5
mdb_node_search:5135:7039 found leaf index 1 [00000000000000010000000000000001b1f3f9b0], rc = -128
mdb_node_search:5135:7039 found leaf index 0 [00000000000000010000000000000001311e7dc5], rc = 0
mdb_cursor_set:6002:7039 ==> cursor placed on key [00000000000000010000000000000001311e7dc5]
mdb_txn_reset:2990:7039 mdb_txn_reset
mdb_txn_end:2919:7039 mdb_txn_end
mdb_txn_end:2931:7039 reset txn 1862r 0x7f4034000a10 on mdbenv 0xd483c0, root page 417
GoshawkDBConsistencyChecker 2016/03/26 22:24:37.799971 ...loading from /tmp/data2
GoshawkDBConsistencyChecker 2016/03/26 22:24:37.800025 Starting disk server on /tmp/data2
mdb_env_create:3862:7040 mdb_env_create
mdb_env_open:4702:7040 mdb_env_open
mdb_env_open2:4192:7040 opened database version 1, pagesize 4096
mdb_env_open2:4193:7040 using meta page 1
mdb_env_open2:4194:7040 depth: 1
mdb_env_open2:4195:7040 entries: 5
mdb_env_open2:4196:7040 branch pages: 0
mdb_env_open2:4197:7040 leaf pages: 1
mdb_env_open2:4198:7040 overflow pages: 0
mdb_env_open2:4199:7040 root: 1291
mdb_env_open:4821:7040 opened dbenv 0x7f402c0008c0
mdb_txn_begin:2767:7040 mdb_txn_begin
mdb_txn_begin:2860:7040 begin txn 1796w 0x7f402c001b80 on mdbenv 0x7f402c0008c0, root page 1291
mdb_cursor_set:5812:7040 mdb_cursor_set
mdb_page_search:5445:7040 db 1 root page 1291 has flags 0x2
mdb_page_search_root:5342:7040 found leaf page 1291 for key [5472616e73616374696f6e73]
mdb_node_search:5091:7040 searching 5 keys in leaf page 1291
mdb_node_search:5135:7040 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5135:7040 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_cursor_set:6002:7040 ==> cursor placed on key [5472616e73616374696f6e73]
mdb_cursor_set:5812:7040 mdb_cursor_set
mdb_page_search:5445:7040 db 1 root page 1291 has flags 0x2
mdb_page_search_root:5342:7040 found leaf page 1291 for key [5472616e73616374696f6e52656673]
mdb_node_search:5091:7040 searching 5 keys in leaf page 1291
mdb_node_search:5135:7040 found leaf index 2 [5472616e73616374696f6e52656673], rc = 0
mdb_cursor_set:6002:7040 ==> cursor placed on key [5472616e73616374696f6e52656673]
mdb_cursor_set:5812:7040 mdb_cursor_set
mdb_page_search:5445:7040 db 1 root page 1291 has flags 0x2
mdb_page_search_root:5342:7040 found leaf page 1291 for key [56617273]
mdb_node_search:5091:7040 searching 5 keys in leaf page 1291
mdb_node_search:5135:7040 found leaf index 2 [5472616e73616374696f6e52656673], rc = 2
mdb_node_search:5135:7040 found leaf index 3 [5472616e73616374696f6e73], rc = 2
mdb_node_search:5135:7040 found leaf index 4 [56617273], rc = 0
mdb_cursor_set:6002:7040 ==> cursor placed on key [56617273]
mdb_txn_commit:3361:7040 mdb_txn_commit
mdb_txn_end:2919:7040 mdb_txn_end
mdb_txn_end:2931:7040 empty-commit txn 1796w 0x7f402c001b80 on mdbenv 0x7f402c0008c0, root page 1291
mdb_txn_begin:2767:7041 mdb_txn_begin
mdb_txn_begin:2860:7041 begin txn 1795r 0x7f4030000a10 on mdbenv 0x7f402c0008c0, root page 1291
mdb_txn_renew:2749:7041 mdb_txn_renew
mdb_txn_abort:3004:7041 mdb_txn_abort
mdb_txn_end:2919:7041 mdb_txn_end
mdb_txn_end:2931:7041 abort txn 1795r 0x7f4030000a10 on mdbenv 0x7f402c0008c0, root page 1291
mdb_txn_begin:2767:7041 mdb_txn_begin
mdb_txn_begin:2860:7041 begin txn 1795r 0x7f4030000a10 on mdbenv 0x7f402c0008c0, root page 1291
mdb_get:5570:7041 mdb_get
mdb_get:5576:7041 ===> get db 4 key [0000000000000000000000000000000000000000]
mdb_page_search:5445:7041 db 1 root page 1291 has flags 0x2
mdb_page_search_root:5342:7041 found leaf page 1291 for key [56617273]
mdb_node_search:5091:7041 searching 5 keys in leaf page 1291
mdb_node_search:5135:7041 found leaf index 2 [5472616e73616374696f6e52656673], rc = 2
mdb_node_search:5135:7041 found leaf index 3 [5472616e73616374696f6e73], rc = 2
mdb_node_search:5135:7041 found leaf index 4 [56617273], rc = 0
mdb_page_search:5445:7041 db 4 root page 530 has flags 0x1
mdb_cursor_set:5812:7041 mdb_cursor_set
mdb_page_search:5445:7041 db 4 root page 530 has flags 0x1
mdb_page_search_root:5290:7041 branch page 530 has 3 keys
mdb_page_search_root:5296:7041 found index 0 to page 535
mdb_node_search:5091:7041 searching 3 keys in branch page 530
mdb_node_search:5138:7041 found branch index 1 [000000000000010b0000000600000001311e7dc5 -> 1361], rc = -1
mdb_page_search_root:5314:7041 following index 0 for key [0000000000000000000000000000000000000000]
mdb_cursor_push:5202:7041 pushing page 535 on db 4 cursor 0x7f403b2796b0
mdb_page_search_root:5290:7041 branch page 535 has 68 keys
mdb_page_search_root:5296:7041 found index 0 to page 35
mdb_node_search:5091:7041 searching 68 keys in branch page 535
mdb_node_search:5138:7041 found branch index 34 [00000000000000700000000600000001311e7dc5 -> 262], rc = -28672
mdb_node_search:5138:7041 found branch index 17 [00000000000000210000000600000001311e7dc5 -> 41], rc = -8448
mdb_node_search:5138:7041 found branch index 8 [000000000000000f0000000600000001311e7dc5 -> 383], rc = -3840
mdb_node_search:5138:7041 found branch index 4 [00000000000000040000000600000001311e7dc5 -> 97], rc = -1024
mdb_node_search:5138:7041 found branch index 2 [00000000000000010000000300000001311e7dc5 -> 568], rc = -256
mdb_node_search:5138:7041 found branch index 1 [00000000000000000000000600000001311e7dc5 -> 197], rc = -1536
mdb_page_search_root:5314:7041 following index 0 for key [0000000000000000000000000000000000000000]
mdb_cursor_push:5202:7041 pushing page 35 on db 4 cursor 0x7f403b2796b0
mdb_page_search_root:5342:7041 found leaf page 35 for key [0000000000000000000000000000000000000000]
mdb_node_search:5091:7041 searching 6 keys in leaf page 35
mdb_node_search:5135:7041 found leaf index 2 [000000000000000000000000000000015b297cbd], rc = -256
mdb_node_search:5135:7041 found leaf index 0 [0000000000000000000000000000000000000000], rc = 0
mdb_cursor_set:6002:7041 ==> cursor placed on key [0000000000000000000000000000000000000000]
mdb_get:5570:7041 mdb_get
mdb_get:5576:7041 ===> get db 2 key [00000000000000010000000000000001311e7dc5]
mdb_page_search:5445:7041 db 1 root page 1291 has flags 0x2
mdb_page_search_root:5342:7041 found leaf page 1291 for key [5472616e73616374696f6e73]
mdb_node_search:5091:7041 searching 5 keys in leaf page 1291
mdb_node_search:5135:7041 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5135:7041 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_page_search:5445:7041 db 2 root page 1304 has flags 0x1
mdb_cursor_set:5812:7041 mdb_cursor_set
mdb_page_search:5445:7041 db 2 root page 1304 has flags 0x1
mdb_page_search_root:5290:7041 branch page 1304 has 2 keys
mdb_page_search_root:5296:7041 found index 0 to page 238
mdb_node_search:5091:7041 searching 2 keys in branch page 1304
mdb_node_search:5138:7041 found branch index 1 [00000000000002cc0000000000000001311e7dc5 -> 1305], rc = -2
mdb_page_search_root:5314:7041 following index 0 for key [00000000000000010000000000000001311e7dc5]
mdb_cursor_push:5202:7041 pushing page 238 on db 2 cursor 0x7f403b2796b0
mdb_page_search_root:5290:7041 branch page 238 has 68 keys
mdb_page_search_root:5296:7041 found index 0 to page 2
mdb_node_search:5091:7041 searching 68 keys in branch page 238
mdb_node_search:5138:7041 found branch index 34 [00000000000000bd0000000000000001311e7dc5 -> 57], rc = -48128
mdb_node_search:5138:7041 found branch index 17 [000000000000005c0000000000000001311e7dc5 -> 18], rc = -23296
mdb_node_search:5138:7041 found branch index 8 [000000000000001d0000000000000001311e7dc5 -> 151], rc = -7168
mdb_node_search:5138:7041 found branch index 4 [000000000000000e0000000000000001311e7dc5 -> 28], rc = -3328
mdb_node_search:5138:7041 found branch index 2 [000000000000000200000000000000015b297cbd -> 133], rc = -256
mdb_node_search:5138:7041 found branch index 1 [00000000000000010000000000000001311e7dc5 -> 8], rc = 0
mdb_page_search_root:5314:7041 following index 1 for key [00000000000000010000000000000001311e7dc5]
mdb_cursor_push:5202:7041 pushing page 8 on db 2 cursor 0x7f403b2796b0
mdb_page_search_root:5342:7041 found leaf page 8 for key [00000000000000010000000000000001311e7dc5]
mdb_node_search:5091:7041 searching 3 keys in leaf page 8
mdb_node_search:5135:7041 found leaf index 1 [00000000000000010000000000000001b1f3f9b0], rc = -128
mdb_node_search:5135:7041 found leaf index 0 [00000000000000010000000000000001311e7dc5], rc = 0
mdb_cursor_set:6002:7041 ==> cursor placed on key [00000000000000010000000000000001311e7dc5]
mdb_txn_reset:2990:7041 mdb_txn_reset
mdb_txn_end:2919:7041 mdb_txn_end
mdb_txn_end:2931:7041 reset txn 1795r 0x7f4030000a10 on mdbenv 0x7f402c0008c0, root page 1291
mdb_txn_renew:2749:7041 mdb_txn_renew
mdb_txn_renew:2759:7041 renew txn 1795r 0x7f4030000a10 on mdbenv 0x7f402c0008c0, root page 1291
mdb_cursor_open:7408:7041 mdb_cursor_open
mdb_page_search:5445:7041 db 1 root page 1291 has flags 0x2
mdb_page_search_root:5342:7041 found leaf page 1291 for key [56617273]
mdb_node_search:5091:7041 searching 5 keys in leaf page 1291
mdb_node_search:5135:7041 found leaf index 2 [5472616e73616374696f6e52656673], rc = 2
mdb_node_search:5135:7041 found leaf index 3 [5472616e73616374696f6e73], rc = 2
mdb_node_search:5135:7041 found leaf index 4 [56617273], rc = 0
mdb_page_search:5445:7041 db 4 root page 530 has flags 0x1
mdb_cursor_get:6103:7041 mdb_cursor_get
mdb_cursor_first:6011:7041 mdb_cursor_first
mdb_page_search:5445:7041 db 4 root page 530 has flags 0x1
mdb_page_search_root:5290:7041 branch page 530 has 3 keys
mdb_page_search_root:5296:7041 found index 0 to page 535
mdb_cursor_push:5202:7041 pushing page 535 on db 4 cursor 0x7f4030000d00
mdb_page_search_root:5290:7041 branch page 535 has 68 keys
mdb_page_search_root:5296:7041 found index 0 to page 35
mdb_cursor_push:5202:7041 pushing page 35 on db 4 cursor 0x7f4030000d00
mdb_page_search_root:5342:7041 found leaf page 35 for key [null]
RM:b1f3f9b0(/tmp/data2) VarUUId:0000000000000000000000000000000000000000 [0 0 0 0 26 0 0 0 0 0 0 0 0 0 5 0 17 0 0 0 162 0 0 0 25 0 0 0 2 0 0 0 21 0 0 0 162 0 0 0 28 0 0 0 0 0 2 0 52 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 49 30 125 197 0 0 0 0 5 0 0 0 14 0 0 0 17 0 0 0 13 0 0 0 1 0 0 0 162 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 5 0 0 0 14 0 0 0 5 0 0 0 13 0 0 0 5 0 0 0 162 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
mdb_txn_renew:2749:7039 mdb_txn_renew
mdb_txn_renew:2759:7039 renew txn 1862r 0x7f4034000a10 on mdbenv 0xd483c0, root page 417
mdb_cursor_open:7408:7039 mdb_cursor_open
mdb_page_search:5445:7039 db 1 root page 417 has flags 0x2
mdb_page_search_root:5342:7039 found leaf page 417 for key [5472616e73616374696f6e73]
mdb_node_search:5091:7039 searching 5 keys in leaf page 417
mdb_node_search:5135:7039 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5135:7039 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_page_search:5445:7039 db 4 root page 276 has flags 0x1
mdb_cursor_get:6103:7039 mdb_cursor_get
mdb_cursor_first:6011:7039 mdb_cursor_first
mdb_page_search:5445:7039 db 4 root page 276 has flags 0x1
mdb_page_search_root:5290:7039 branch page 276 has 2 keys
mdb_page_search_root:5296:7039 found index 0 to page 710
mdb_cursor_push:5202:7039 pushing page 710 on db 4 cursor 0x7f4034000bd0
mdb_page_search_root:5290:7039 branch page 710 has 134 keys
mdb_page_search_root:5296:7039 found index 0 to page 43
mdb_cursor_push:5202:7039 pushing page 43 on db 4 cursor 0x7f4034000bd0
mdb_page_search_root:5342:7039 found leaf page 43 for key [null]
mdb_cursor_close:7493:7039 mdb_cursor_close
mdb_txn_reset:2990:7039 mdb_txn_reset
mdb_txn_end:2919:7039 mdb_txn_end
mdb_txn_end:2931:7039 reset txn 1862r 0x7f4034000a10 on mdbenv 0xd483c0, root page 417
GoshawkDBConsistencyChecker 2016/03/26 22:24:37.802540 Shutting down iterator
GoshawkDBConsistencyChecker 2016/03/26 22:24:37.802554 Err on finding first var in RM:311e7dc5(/tmp/data1): expected to find topology var, but found VarUUId:000000000000000000000000000000015b297cbd instead! ([0 0 0 0 30 0 0 0 0 0 0 0 2 0 3 0 189 124 41 91 1 0 0 0 0 2 0 0 2 0 0 0 9 0 0 0 162 0 0 0 17 0 0 0 47 0 0 0 57 0 0 0 55 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 91 41 124 189 0 0 0 0 4 0 0 0 1 0 4 0 3 0 0 0 0 0 0 0 13 0 0 0 162 0 0 0 21 0 0 0 42 0 0 0 21 0 0 0 2 0 0 0 17 0 0 0 7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 91 41 124 189 0 0 0 0 0 1 2 3 4 0 0 0 0 0 0 0 0 0 2 0 12 0 0 0 1 0 1 0 197 125 30 49 1 0 0 0 17 0 0 0 11 0 0 0 176 249 243 177 1 0 0 0 13 0 0 0 11 0 0 0 189 124 41 91 0 0 0 0 9 0 0 0 11 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0])
--hQiwHBbRI9kgIhsi--
7 years, 8 months
Re: (ITS#8392) Opening multiple databases from the same process
by matthew＠wellquite.org
--rwEMma7ioTxnRzrJ
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Hi Howard,
Thanks for the quick reply.
On Sat, Mar 26, 2016 at 06:44:29PM +0000, Howard Chu wrote:
> Is this entire task read-only, nobody is modifying any of the DBs while
> these readers are iterating thru the DBs?
This entire process is read only, and indeed the transactions that
contain cursors are marked RDONLY. No other process is running that
accesses any of these databases.
> You might consider compiling LMDB with MDB_DEBUG defined, enabling debug
> output, and then watching the cursor activity. Of course, the act of writing
> debug messages will impact thread scheduling, so it may not reveal what's
> going on.
Ok, I've done all that and got debug output going. I can still provoke
the same problem easily. A log is attached.
Ultimately, both cursors should start on a key
0000000000000000000000000000000000000000, but the second cursor/db
discovers it actually starts on
0000000000000000000000000000000141d8872b.
One problem is that the debug output gives no indication of which thread
is which so it seems pretty tricky to separate out the different calls.
Do you have any hints or tricks for doing this?
Matthew
--rwEMma7ioTxnRzrJ
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename=log
GoshawkDBConsistencyChecker 2016/03/26 20:58:25.362121 [./consistencychecker /tmp/data1 /tmp/data2]
GoshawkDBConsistencyChecker 2016/03/26 20:58:25.362201 ...loading from /tmp/data1
GoshawkDBConsistencyChecker 2016/03/26 20:58:25.362223 Starting disk server on /tmp/data1
mdb_env_open2:4175 opened database version 1, pagesize 4096
mdb_env_open2:4176 using meta page 0
mdb_env_open2:4177 depth: 1
mdb_env_open2:4178 entries: 5
mdb_env_open2:4179 branch pages: 0
mdb_env_open2:4180 leaf pages: 1
mdb_env_open2:4181 overflow pages: 0
mdb_env_open2:4182 root: 1192
mdb_env_open:4803 opened dbenv 0xd363c0
mdb_txn_begin:2850 begin txn 1785w 0xd37660 on mdbenv 0xd363c0, root page 1192
mdb_page_search:5426 db 1 root page 1192 has flags 0x2
mdb_page_search_root:5323 found leaf page 1192 for key [5472616e73616374696f6e52656673]
mdb_node_search:5072 searching 5 keys in leaf page 1192
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 0
mdb_cursor_set:5980 ==> cursor placed on key [5472616e73616374696f6e52656673]
mdb_page_search:5426 db 1 root page 1192 has flags 0x2
mdb_page_search_root:5323 found leaf page 1192 for key [56617273]
mdb_node_search:5072 searching 5 keys in leaf page 1192
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 2
mdb_node_search:5116 found leaf index 3 [5472616e73616374696f6e73], rc = 2
mdb_node_search:5116 found leaf index 4 [56617273], rc = 0
mdb_cursor_set:5980 ==> cursor placed on key [56617273]
mdb_page_search:5426 db 1 root page 1192 has flags 0x2
mdb_page_search_root:5323 found leaf page 1192 for key [5472616e73616374696f6e73]
mdb_node_search:5072 searching 5 keys in leaf page 1192
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5116 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_cursor_set:5980 ==> cursor placed on key [5472616e73616374696f6e73]
mdb_txn_end:2918 empty-commit txn 1785w 0xd37660 on mdbenv 0xd363c0, root page 1192
mdb_txn_begin:2850 begin txn 1784r 0x7f36e8000a10 on mdbenv 0xd363c0, root page 1192
mdb_txn_end:2918 abort txn 1784r 0x7f36e8000a10 on mdbenv 0xd363c0, root page 1192
mdb_txn_begin:2850 begin txn 1784r 0x7f36e8000a10 on mdbenv 0xd363c0, root page 1192
mdb_get:5556 ===> get db 3 key [0000000000000000000000000000000000000000]
mdb_page_search:5426 db 1 root page 1192 has flags 0x2
mdb_page_search_root:5323 found leaf page 1192 for key [56617273]
mdb_node_search:5072 searching 5 keys in leaf page 1192
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 2
mdb_node_search:5116 found leaf index 3 [5472616e73616374696f6e73], rc = 2
mdb_node_search:5116 found leaf index 4 [56617273], rc = 0
mdb_page_search:5426 db 3 root page 854 has flags 0x1
mdb_page_search:5426 db 3 root page 854 has flags 0x1
mdb_page_search_root:5271 branch page 854 has 2 keys
mdb_page_search_root:5277 found index 0 to page 868
mdb_node_search:5072 searching 2 keys in branch page 854
mdb_node_search:5119 found branch index 1 [00000000000001f500000006000000016634c9ee -> 734], rc = -1
mdb_page_search_root:5295 following index 0 for key [0000000000000000000000000000000000000000]
mdb_cursor_push:5183 pushing page 868 on db 3 cursor 0x7f36f0d5e6c0
mdb_page_search_root:5271 branch page 868 has 135 keys
mdb_page_search_root:5277 found index 0 to page 96
mdb_node_search:5072 searching 135 keys in branch page 868
mdb_node_search:5119 found branch index 67 [00000000000000c600000006000000016634c9ee -> 65], rc = -50688
mdb_node_search:5119 found branch index 33 [000000000000005a00000006000000016634c9ee -> 61], rc = -23040
mdb_node_search:5119 found branch index 16 [000000000000001900000006000000016634c9ee -> 964], rc = -6400
mdb_node_search:5119 found branch index 8 [000000000000000f00000006000000016634c9ee -> 72], rc = -3840
mdb_node_search:5119 found branch index 4 [000000000000000500000006000000016634c9ee -> 124], rc = -1280
mdb_node_search:5119 found branch index 2 [000000000000000100000004000000016634c9ee -> 1021], rc = -256
mdb_node_search:5119 found branch index 1 [000000000000000000000006000000016634c9ee -> 869], rc = -1536
mdb_page_search_root:5295 following index 0 for key [0000000000000000000000000000000000000000]
mdb_cursor_push:5183 pushing page 96 on db 3 cursor 0x7f36f0d5e6c0
mdb_page_search_root:5323 found leaf page 96 for key [0000000000000000000000000000000000000000]
mdb_node_search:5072 searching 7 keys in leaf page 96
mdb_node_search:5116 found leaf index 3 [000000000000000000000000000000019f23085d], rc = -256
mdb_node_search:5116 found leaf index 1 [0000000000000000000000000000000141d8872b], rc = -256
mdb_node_search:5116 found leaf index 0 [0000000000000000000000000000000000000000], rc = 0
mdb_cursor_set:5980 ==> cursor placed on key [0000000000000000000000000000000000000000]
mdb_get:5556 ===> get db 4 key [000000000000000100000000000000019f23085d]
mdb_page_search:5426 db 1 root page 1192 has flags 0x2
mdb_page_search_root:5323 found leaf page 1192 for key [5472616e73616374696f6e73]
mdb_node_search:5072 searching 5 keys in leaf page 1192
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5116 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_page_search:5426 db 4 root page 592 has flags 0x1
mdb_page_search:5426 db 4 root page 592 has flags 0x1
mdb_page_search_root:5271 branch page 592 has 128 keys
mdb_page_search_root:5277 found index 0 to page 37
mdb_node_search:5072 searching 128 keys in branch page 592
mdb_node_search:5119 found branch index 64 [00000000000001fe000000000000000141d8872b -> 565], rc = -1
mdb_node_search:5119 found branch index 32 [00000000000000fe00000000000000019f23085d -> 461], rc = -64768
mdb_node_search:5119 found branch index 16 [000000000000007300000000000000016634c9ee -> 323], rc = -29184
mdb_node_search:5119 found branch index 8 [000000000000003f000000000000000141d8872b -> 20], rc = -15872
mdb_node_search:5119 found branch index 4 [000000000000001200000000000000019f23085d -> 448], rc = -4352
mdb_node_search:5119 found branch index 2 [000000000000000200000000000000019f23085d -> 141], rc = -256
mdb_node_search:5119 found branch index 1 [000000000000000100000000000000019f23085d -> 142], rc = 0
mdb_page_search_root:5295 following index 1 for key [000000000000000100000000000000019f23085d]
mdb_cursor_push:5183 pushing page 142 on db 4 cursor 0x7f36f0d5e6c0
mdb_page_search_root:5323 found leaf page 142 for key [000000000000000100000000000000019f23085d]
mdb_node_search:5072 searching 3 keys in leaf page 142
mdb_node_search:5116 found leaf index 1 [0000000000000002000000000000000141d8872b], rc = -256
mdb_node_search:5116 found leaf index 0 [000000000000000100000000000000019f23085d], rc = 0
mdb_cursor_set:5980 ==> cursor placed on key [000000000000000100000000000000019f23085d]
mdb_txn_end:2918 reset txn 1784r 0x7f36e8000a10 on mdbenv 0xd363c0, root page 1192
GoshawkDBConsistencyChecker 2016/03/26 20:58:25.364770 ...loading from /tmp/data2
GoshawkDBConsistencyChecker 2016/03/26 20:58:25.364807 Starting disk server on /tmp/data2
mdb_env_open2:4175 opened database version 1, pagesize 4096
mdb_env_open2:4176 using meta page 1
mdb_env_open2:4177 depth: 1
mdb_env_open2:4178 entries: 5
mdb_env_open2:4179 branch pages: 0
mdb_env_open2:4180 leaf pages: 1
mdb_env_open2:4181 overflow pages: 0
mdb_env_open2:4182 root: 1239
mdb_env_open:4803 opened dbenv 0x7f36e00008c0
mdb_txn_begin:2850 begin txn 1858w 0x7f36e0001b80 on mdbenv 0x7f36e00008c0, root page 1239
mdb_page_search:5426 db 1 root page 1239 has flags 0x2
mdb_page_search_root:5323 found leaf page 1239 for key [5472616e73616374696f6e73]
mdb_node_search:5072 searching 5 keys in leaf page 1239
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5116 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_cursor_set:5980 ==> cursor placed on key [5472616e73616374696f6e73]
mdb_page_search:5426 db 1 root page 1239 has flags 0x2
mdb_page_search_root:5323 found leaf page 1239 for key [5472616e73616374696f6e52656673]
mdb_node_search:5072 searching 5 keys in leaf page 1239
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 0
mdb_cursor_set:5980 ==> cursor placed on key [5472616e73616374696f6e52656673]
mdb_page_search:5426 db 1 root page 1239 has flags 0x2
mdb_page_search_root:5323 found leaf page 1239 for key [56617273]
mdb_node_search:5072 searching 5 keys in leaf page 1239
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 2
mdb_node_search:5116 found leaf index 3 [5472616e73616374696f6e73], rc = 2
mdb_node_search:5116 found leaf index 4 [56617273], rc = 0
mdb_cursor_set:5980 ==> cursor placed on key [56617273]
mdb_txn_end:2918 empty-commit txn 1858w 0x7f36e0001b80 on mdbenv 0x7f36e00008c0, root page 1239
mdb_txn_begin:2850 begin txn 1857r 0x7f36e4000a10 on mdbenv 0x7f36e00008c0, root page 1239
mdb_txn_end:2918 abort txn 1857r 0x7f36e4000a10 on mdbenv 0x7f36e00008c0, root page 1239
mdb_txn_begin:2850 begin txn 1857r 0x7f36e4000a10 on mdbenv 0x7f36e00008c0, root page 1239
mdb_get:5556 ===> get db 4 key [0000000000000000000000000000000000000000]
mdb_page_search:5426 db 1 root page 1239 has flags 0x2
mdb_page_search_root:5323 found leaf page 1239 for key [56617273]
mdb_node_search:5072 searching 5 keys in leaf page 1239
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 2
mdb_node_search:5116 found leaf index 3 [5472616e73616374696f6e73], rc = 2
mdb_node_search:5116 found leaf index 4 [56617273], rc = 0
mdb_page_search:5426 db 4 root page 633 has flags 0x1
mdb_page_search:5426 db 4 root page 633 has flags 0x1
mdb_page_search_root:5271 branch page 633 has 2 keys
mdb_page_search_root:5277 found index 0 to page 634
mdb_node_search:5072 searching 2 keys in branch page 633
mdb_node_search:5119 found branch index 1 [00000000000000f900000006000000016634c9ee -> 115], rc = -63744
mdb_page_search_root:5295 following index 0 for key [0000000000000000000000000000000000000000]
mdb_cursor_push:5183 pushing page 634 on db 4 cursor 0x7f36f055d6c0
mdb_page_search_root:5271 branch page 634 has 68 keys
mdb_page_search_root:5277 found index 0 to page 56
mdb_node_search:5072 searching 68 keys in branch page 634
mdb_node_search:5119 found branch index 34 [000000000000006100000006000000016634c9ee -> 562], rc = -24832
mdb_node_search:5119 found branch index 17 [000000000000001c00000006000000016634c9ee -> 18], rc = -7168
mdb_node_search:5119 found branch index 8 [000000000000000e00000006000000016634c9ee -> 160], rc = -3584
mdb_node_search:5119 found branch index 4 [000000000000000400000006000000016634c9ee -> 405], rc = -1024
mdb_node_search:5119 found branch index 2 [000000000000000100000004000000016634c9ee -> 489], rc = -256
mdb_node_search:5119 found branch index 1 [000000000000000000000006000000016634c9ee -> 636], rc = -1536
mdb_page_search_root:5295 following index 0 for key [0000000000000000000000000000000000000000]
mdb_cursor_push:5183 pushing page 56 on db 4 cursor 0x7f36f055d6c0
mdb_page_search_root:5323 found leaf page 56 for key [0000000000000000000000000000000000000000]
mdb_node_search:5072 searching 7 keys in leaf page 56
mdb_node_search:5116 found leaf index 3 [000000000000000000000000000000019f23085d], rc = -256
mdb_node_search:5116 found leaf index 1 [0000000000000000000000000000000141d8872b], rc = -256
mdb_node_search:5116 found leaf index 0 [0000000000000000000000000000000000000000], rc = 0
mdb_cursor_set:5980 ==> cursor placed on key [0000000000000000000000000000000000000000]
mdb_get:5556 ===> get db 2 key [000000000000000100000000000000019f23085d]
mdb_page_search:5426 db 1 root page 1239 has flags 0x2
mdb_page_search_root:5323 found leaf page 1239 for key [5472616e73616374696f6e73]
mdb_node_search:5072 searching 5 keys in leaf page 1239
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5116 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_page_search:5426 db 2 root page 606 has flags 0x1
mdb_page_search:5426 db 2 root page 606 has flags 0x1
mdb_page_search_root:5271 branch page 606 has 128 keys
mdb_page_search_root:5277 found index 0 to page 8
mdb_node_search:5072 searching 128 keys in branch page 606
mdb_node_search:5119 found branch index 64 [0000000000000219000000000000000141d8872b -> 414], rc = -2
mdb_node_search:5119 found branch index 32 [00000000000000fe00000000000000019f23085d -> 832], rc = -64768
mdb_node_search:5119 found branch index 16 [000000000000007400000000000000016634c9ee -> 85], rc = -29440
mdb_node_search:5119 found branch index 8 [000000000000003f000000000000000141d8872b -> 108], rc = -15872
mdb_node_search:5119 found branch index 4 [000000000000001200000000000000019f23085d -> 10], rc = -4352
mdb_node_search:5119 found branch index 2 [000000000000000200000000000000019f23085d -> 19], rc = -256
mdb_node_search:5119 found branch index 1 [000000000000000100000000000000019f23085d -> 33], rc = 0
mdb_page_search_root:5295 following index 1 for key [000000000000000100000000000000019f23085d]
mdb_cursor_push:5183 pushing page 33 on db 2 cursor 0x7f36f055d6c0
mdb_page_search_root:5323 found leaf page 33 for key [000000000000000100000000000000019f23085d]
mdb_node_search:5072 searching 3 keys in leaf page 33
mdb_node_search:5116 found leaf index 1 [0000000000000002000000000000000141d8872b], rc = -256
mdb_node_search:5116 found leaf index 0 [000000000000000100000000000000019f23085d], rc = 0
mdb_cursor_set:5980 ==> cursor placed on key [000000000000000100000000000000019f23085d]
mdb_txn_end:2918 reset txn 1857r 0x7f36e4000a10 on mdbenv 0x7f36e00008c0, root page 1239
mdb_txn_renew:2750 renew txn 1857r 0x7f36e4000a10 on mdbenv 0x7f36e00008c0, root page 1239
mdb_page_search:5426 db 1 root page 1239 has flags 0x2
mdb_page_search_root:5323 found leaf page 1239 for key [56617273]
mdb_node_search:5072 searching 5 keys in leaf page 1239
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 2
mdb_node_search:5116 found leaf index 3 [5472616e73616374696f6e73], rc = 2
mdb_node_search:5116 found leaf index 4 [56617273], rc = 0
mdb_page_search:5426 db 4 root page 633 has flags 0x1
mdb_page_search:5426 db 4 root page 633 has flags 0x1
mdb_page_search_root:5271 branch page 633 has 2 keys
mdb_page_search_root:5277 found index 0 to page 634
mdb_cursor_push:5183 pushing page 634 on db 4 cursor 0x7f36e4000bd0
mdb_page_search_root:5271 branch page 634 has 68 keys
mdb_page_search_root:5277 found index 0 to page 56
mdb_cursor_push:5183 pushing page 56 on db 4 cursor 0x7f36e4000bd0
mdb_page_search_root:5323 found leaf page 56 for key [null]
RM:9f23085d(/tmp/data2) VarUUId:0000000000000000000000000000000000000000 [0 0 0 0 26 0 0 0 0 0 0 0 0 0 5 0 17 0 0 0 162 0 0 0 25 0 0 0 2 0 0 0 21 0 0 0 162 0 0 0 28 0 0 0 0 0 2 0 52 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 159 35 8 93 0 0 0 0 5 0 0 0 14 0 0 0 17 0 0 0 13 0 0 0 1 0 0 0 162 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 5 0 0 0 14 0 0 0 5 0 0 0 13 0 0 0 5 0 0 0 162 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
mdb_txn_renew:2750 renew txn 1784r 0x7f36e8000a10 on mdbenv 0xd363c0, root page 1192
mdb_page_search:5426 db 1 root page 1192 has flags 0x2
mdb_page_search_root:5323 found leaf page 1192 for key [5472616e73616374696f6e73]
mdb_node_search:5072 searching 5 keys in leaf page 1192
mdb_node_search:5116 found leaf index 2 [5472616e73616374696f6e52656673], rc = 8448
mdb_node_search:5116 found leaf index 3 [5472616e73616374696f6e73], rc = 0
mdb_page_search:5426 db 4 root page 592 has flags 0x1
mdb_page_search:5426 db 4 root page 592 has flags 0x1
mdb_page_search_root:5271 branch page 592 has 128 keys
mdb_page_search_root:5277 found index 0 to page 37
mdb_cursor_push:5183 pushing page 37 on db 4 cursor 0x7f36e8000bd0
mdb_page_search_root:5323 found leaf page 37 for key [null]
mdb_txn_end:2918 reset txn 1784r 0x7f36e8000a10 on mdbenv 0xd363c0, root page 1192
GoshawkDBConsistencyChecker 2016/03/26 20:58:25.367498 Shutting down iterator
GoshawkDBConsistencyChecker 2016/03/26 20:58:25.367507 Err on finding first var in RM:6634c9ee(/tmp/data1): expected to find topology var, but found VarUUId:0000000000000000000000000000000141d8872b instead! ([0 0 0 0 30 0 0 0 0 0 0 0 2 0 3 0 43 135 216 65 1 0 0 0 0 2 0 0 2 0 0 0 9 0 0 0 162 0 0 0 17 0 0 0 47 0 0 0 57 0 0 0 55 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 65 216 135 43 0 0 0 0 4 0 0 0 1 0 4 0 3 0 0 0 0 0 0 0 13 0 0 0 162 0 0 0 21 0 0 0 42 0 0 0 21 0 0 0 2 0 0 0 17 0 0 0 7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 65 216 135 43 0 0 0 0 0 1 2 3 4 0 0 0 0 0 0 0 0 0 2 0 12 0 0 0 1 0 1 0 238 201 52 102 1 0 0 0 17 0 0 0 11 0 0 0 93 8 35 159 1 0 0 0 13 0 0 0 11 0 0 0 43 135 216 65 0 0 0 0 9 0 0 0 11 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0])
--rwEMma7ioTxnRzrJ--
7 years, 8 months
Re: (ITS#8392) Opening multiple databases from the same process
by hyc＠symas.com
matthew(a)wellquite.org wrote:
> Full_Name: Matthew Sackman
> Version: LMDB 0.9.18
> OS: Linux
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (109.149.185.170)
>
>
> Linux koba 4.4.0-1-amd64 #1 SMP Debian 4.4.6-1 (2016-03-17) x86_64 GNU/Linux
> LMDB 0.9.18 (compiled locally)
>
> I'm currently writing a program that iterates through multiple LMDB databases in
> order to check differences between them. On each database I have one
> long-running read-only txn with a cursor, and I'm walking through all the
> databases at the same time.
>
> I'm seeing some very odd behaviour. For example, cursor.Get with FIRST is not
> always returning the first item in the table (which I happen to know exactly
> what it should be). The behaviour is non-deterministic - different runs produce
> different results.
>
> I've searched through the docs and I can't find any statements regarding opening
> multiple dbs from the same process. Is this supported?
>
> I'm writing this in Go, using my own bindings. I'm pretty certain that I'm doing
> all the threading correctly and I certainly get this same issue regardless of
> whether I'm using NOTLS or not (with my bindings, it shouldn't be necessary
> because I'm locking go-routines to os-threads), plus these are the same bindings
> that I've used throughout GoshawkDB and I've not come across this problem until
> now.
>
> I can guarantee that each DB that I open will be opened in a different OS thread
> and that no single OS thread will ever access different DBs.
Is this entire task read-only, nobody is modifying any of the DBs while these
readers are iterating thru the DBs?
I've only used Go very briefly. I would be quite suspicious of that goroutine
behavior but don't have any insight there.
You might consider compiling LMDB with MDB_DEBUG defined, enabling debug
output, and then watching the cursor activity. Of course, the act of writing
debug messages will impact thread scheduling, so it may not reveal what's
going on.
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
7 years, 8 months
(ITS#8392) Opening multiple databases from the same process
by matthew＠wellquite.org
Full_Name: Matthew Sackman
Version: LMDB 0.9.18
OS: Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (109.149.185.170)
Linux koba 4.4.0-1-amd64 #1 SMP Debian 4.4.6-1 (2016-03-17) x86_64 GNU/Linux
LMDB 0.9.18 (compiled locally)
I'm currently writing a program that iterates through multiple LMDB databases in
order to check differences between them. On each database I have one
long-running read-only txn with a cursor, and I'm walking through all the
databases at the same time.
I'm seeing some very odd behaviour. For example, cursor.Get with FIRST is not
always returning the first item in the table (which I happen to know exactly
what it should be). The behaviour is non-deterministic - different runs produce
different results.
I've searched through the docs and I can't find any statements regarding opening
multiple dbs from the same process. Is this supported?
I'm writing this in Go, using my own bindings. I'm pretty certain that I'm doing
all the threading correctly and I certainly get this same issue regardless of
whether I'm using NOTLS or not (with my bindings, it shouldn't be necessary
because I'm locking go-routines to os-threads), plus these are the same bindings
that I've used throughout GoshawkDB and I've not come across this problem until
now.
I can guarantee that each DB that I open will be opened in a different OS thread
and that no single OS thread will ever access different DBs.
7 years, 8 months
Re: (ITS#8389) ldapsearch
by quanah＠zimbra.com
--On Wednesday, March 16, 2016 4:13 PM +0000 baulin_ss(a)mail.ru wrote:
> Full_Name: Baulin Sergey
> Version: unknown
> OS: Debian8.3
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (195.26.169.27)
The ITS system is for reporting bugs with openldap, not asking how to write
proper shell scripts. This ITS will be closed.
--
Quanah Gibson-Mount
Platform Architect
Zimbra, Inc.
--------------------
Zimbra :: the leader in open source messaging and collaboration
A division of Synacor, Inc
7 years, 8 months
