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(ITS#7566) ldapadd slower on Linux than BSD
by lm5＠ualberta.ca 05 Apr '13

05 Apr '13

Full_Name: Leo Mocofan Version: 2.4.31 OS: Debian Testing URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (129.128.11.107) We are currently testing Linux, OpenBSD and FreeBSD to run our LDAP service. Our tests showed that Linux has great performance numbers in most of the areas but we found one test that is very slow. The database has 1 million entries and is 4.5 GB in size. Importing the whole dababase using slapadd takes minutes on all platforms. When we tried to import the database using ldapadd we noticed a huge difference: FreeBSD - 42 min, OpenBSD - 59 min, Linux - 863 min. Changing file systems for backend in Linux had no effect. Using memory based file system for the backend in Linux the time for ldapadd dropped to 3 min. Strace for ldapadd shows: write(1, "adding new entry \"uid=noname,o"..., 60) = 60 time(NULL) = 1365202241 getrusage(RUSAGE_SELF, {ru_utime={1, 684105}, ru_stime={0, 212013}, ...}) = 0 time(NULL) = 1365202241 times({tms_utime=168, tms_stime=21, tms_cutime=0, tms_cstime=0}) = 1719044914 getrusage(RUSAGE_SELF, {ru_utime={1, 684105}, ru_stime={0, 212013}, ...}) = 0 time(NULL) = 1365202241 times({tms_utime=168, tms_stime=21, tms_cutime=0, tms_cstime=0}) = 1719044914 write(4, "\27\27\27\27\17uJ,\324\324\324\324"..., 1237) = 1237 poll([{fd=4, events=POLLIN|POLLPRI}], 1, 100) = 0 (Timeout) poll([{fd=4, events=POLLIN|POLLPRI}], 1, 100) = 0 (Timeout) poll([{fd=4, events=POLLIN|POLLPRI}], 1, 100) = 0 (Timeout) poll([{fd=4, events=POLLIN|POLLPRI}], 1, 100) = 1 ([{fd=4, revents=POLLIN}]) Strace for one thread of slapd: write(12, "\27\27\27\27\17uJ,\324\324\324\324"..., 117) = 117 time([1365202241]) = 1365202241 sendto(4, "<167>Apr 5 16:50:41 slapd[4513]"..., 79, MSG_NOSIGNAL, NULL, 0) = 79 futex(0x7f36f8fd6724, FUTEX_WAIT_PRIVATE, 9166, NULL) = 0 futex(0x7f36f8fd66f8, FUTEX_WAKE_PRIVATE, 1) = 0 time(NULL) = 1365202242 read(12, "", 5) = 0 write(6, "0", 1) = 1 futex(0x7f36f8fd6724, FUTEX_WAIT_PRIVATE, 9169, NULL Strace for another thread of slapd: futex(0x7f36f8fd66f8, FUTEX_WAKE_PRIVATE, 1) = 1 time(NULL) = 1365202241 epoll_wait(7, {{EPOLLIN, {u32=4177193844, u64=139874082155380}}}, 1024, 150000) = 1 read(5, "0", 8192) = 1 time(NULL) = 1365202241 epoll_wait(7, {{EPOLLIN, {u32=4177193872, u64=139874082155408}}}, 1024, 150000) = 1 epoll_ctl(7, EPOLL_CTL_MOD, 12, {0, {u32=4177193872, u64=139874082155408}}) = 0 futex(0x7f36f8fd6724, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f36f8fd6720, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 time(NULL) = 1365202242 epoll_wait(7, {{EPOLLIN, {u32=4177193844, u64=139874082155380}}}, 1024, 150000) = 1 read(5, "0", 8192) = 1 time(NULL) = 1365202242 epoll_wait(7, {}, 1024, 150000) = 0 time(NULL) = 1365202392 epoll_wait(7, Ldapadd is stuck in poll system call, while one thread of slapd is waiting on epoll_wait(7, After couple of seconds when apparently nothing happens, then everything starts working again. Changing the database backend from to bdb to hdb and mdb doesn't seem to have an effect. We then tried to force SLAP_EVENT_WAIT to use select instead of epoll_wait on Linux and ldapadd is still much slower on Linux. We are runnin Debian testing as of Apr 5, 2013, with glibc-2.13, linux-3.2.41, libdb-5.1.29, openldap-2.4.31.

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Re: (ITS#7563) slapd modifies attribute value of pwdAttribute
by michael＠stroeder.com 05 Apr '13

05 Apr '13

Michael Ströder wrote: > Howard, please try yourself first before answering. > Dieter is right here. > > Example: > > dn: cn=Default Password Policy,ou=Policies,dc=stroeder,dc=de > changetype: modify > delete: pwdAttribute > pwdAttribute: userPassword > - > add: pwdAttribute > pwdAttribute: 2.5.4.35 > - > > Reading it: > > dn: cn=Default Password Policy,ou=Policies,dc=stroeder,dc=de > cn: Default Password Policy > [..] > pwdAttribute: userPassword > [..] > > I vaguely remember I had to implement a work-around in web2ldap to deal with > that when generating delta modification data when the user edits such an entry. BTW: This has nothing to do with replication. Howard Chu wrote before: "Also as a general rule the X.500 data model requires that a server store and return exactly what the user provided." see http://www.openldap.org/lists/openldap-technical/201303/msg00189.html Ciao, Michael.

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(ITS#7565) unacceptable growth on delete with back-mdb
by quanah＠OpenLDAP.org 05 Apr '13

05 Apr '13

Full_Name: Quanah Gibson-Mount Version: 2.4.35 OS: Linux 2.6 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (75.111.39.181) With back-mdb, if you add a large number of users to the database (via ldapadd), and then delete them (via ldapmodify), the DB explodes in size. After the initial ldapadd of 30 million users, the DB is 17GB in size. After deleting the 30 million users, the DB is 52GB in size. This is a 3.05 times larger than the DBs initial size. With back-hdb, there is no change in size of the DB (it is static). Clearly this is not a desirable state of affairs. This appears to be a bug with the freelist. After the add is complete, we have: zimbra@zre-ldap001:~/data/ldap/mdb/db$ mdb_stat -f . Freelist Status Tree depth: 3 Branch pages: 19 Leaf pages: 2007 Overflow pages: 5155 Entries: 15879 Free pages: 2612121 My delete run is not yet complete, but it is now: zimbra@zre-ldap001:~/data/ldap/mdb/db$ mdb_stat -f . Freelist Status Tree depth: 3 Branch pages: 99 Leaf pages: 11096 Overflow pages: 20891 Entries: 82932 Free pages: 9381096 (and growing) --Quanah

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Re: (ITS#7563) slapd modifies attribute value of pwdAttribute
by michael＠stroeder.com 05 Apr '13

05 Apr '13

This is a cryptographically signed message in MIME format. --------------ms070208010706030608090702 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Howard, please try yourself first before answering. Dieter is right here. Example: dn: cn=3DDefault Password Policy,ou=3DPolicies,dc=3Dstroeder,dc=3Dde changetype: modify delete: pwdAttribute pwdAttribute: userPassword - add: pwdAttribute pwdAttribute: 2.5.4.35 - Reading it: dn: cn=3DDefault Password Policy,ou=3DPolicies,dc=3Dstroeder,dc=3Dde cn: Default Password Policy [..] pwdAttribute: userPassword [..] I vaguely remember I had to implement a work-around in web2ldap to deal w= ith that when generating delta modification data when the user edits such an = entry. 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(ITS#7564) LMDB library bug: reopening LMDB may fail, fixed-address mmap
by tamas.kenez＠kishonti.net 05 Apr '13

05 Apr '13

Full_Name: Tamás Kenéz Version: LMDB 8eef7a42 OS: windows 7 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (82.141.191.242) Using the LMDB library (commit 8eef7a4275eda) on windows 7: To reproduce: Run mtest multiple times. The test sometimes fails with the with the windows error code 487 (ERROR_INVALID_ADDRESS) in mdb_env_open -> mdb_env_open2 at this line env->me_map = MapViewOfFileEx(mh, flags & MDB_WRITEMAP ? FILE_MAP_WRITE : FILE_MAP_READ, 0, 0, env->me_mapsize, meta.mm_address); The reason is that when windows fails to map at the specified address (meta.mm_address) it returns 0. I tried this quick workaround: if ( !env->me_map ) env->me_map = MapViewOfFileEx(mh, flags & MDB_WRITEMAP ? FILE_MAP_WRITE : FILE_MAP_READ, 0, 0, env->me_mapsize, NULL); which does return valid address, but then it fails later here: else if (meta.mm_address && env->me_map != meta.mm_address) { /* Can happen because the address argument to mmap() is just a * hint. mmap() can pick another, e.g. if the range is in use. * The MAP_FIXED flag would prevent that, but then mmap could * instead unmap existing pages to make room for the new map. */ return EBUSY; /* TODO: Make a new MDB_* error code? */

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Re: (ITS#7515) Nested liblmdb transaction bugs
by hyc＠symas.com 05 Apr '13

05 Apr '13

h.b.furuseth(a)usit.uio.no wrote: > I wrote: >>> Can't use a DBI from an aborted child txn, unlike aborted main txn: >> (...) >> Well, closing the DBI in mdb_txn_abort() caused problems. A fix >> in the opposite direction is easy, if we want DBIs to work that >> way: mdb_env_open() can open the DBI in any parent txns too. > > To get more consistent behavior, if that wasn't clear: Any parent > txn will receive the DBI independently of commit/abort, just like > the MDB_env. Future children of a preexisting txn still differ, > which is probably for the best. Changing that would take locking. > After much discussion, this part has been reverted. The rationale is simple: nothing created inside a TXN may be visible outside the TXN until the TXN successfully commits. On an abort or failed commit, all DBIs opened in the TXN are automatically closed, because technically they never existed. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#7563) slapd modifies attribute value of pwdAttribute
by hyc＠symas.com 05 Apr '13

05 Apr '13

dieter(a)dkluenter.de wrote: > Full_Name: > Version: 2.4.33 > OS: openSuSE-12.3-x86_64 > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (91.65.235.202) > > > the pwdAttribute type requires a syntax of 1.3.6.1.4.1.1466.115.121.1.38, > according to man slapo-ppolicy and ppolicy.schema. > when adding a policy, the value of pwdAttribute gets changend from OID 2.5.4.35 > to userPassword. You are mistaken. slapd never changes this attribute from what the user stored. > In a replicated system syncrepl complaints about > syncrepl_message_to_entry: rid=001 mods check (pwdAttribute: value #0 invalid > per syntax) do_syncrepl: rid=001 rc 21 retrying. This error will go away if you configure the ppolicy overlay on the consumer. Closing this ITS. > > -Dieter > > -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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(ITS#7563) slapd modifies attribute value of pwdAttribute
by dieter＠dkluenter.de 05 Apr '13

05 Apr '13

Full_Name: Version: 2.4.33 OS: openSuSE-12.3-x86_64 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (91.65.235.202) the pwdAttribute type requires a syntax of 1.3.6.1.4.1.1466.115.121.1.38, according to man slapo-ppolicy and ppolicy.schema. when adding a policy, the value of pwdAttribute gets changend from OID 2.5.4.35 to userPassword. In a replicated system syncrepl complaints about syncrepl_message_to_entry: rid=001 mods check (pwdAttribute: value #0 invalid per syntax) do_syncrepl: rid=001 rc 21 retrying. -Dieter

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(ITS#7562) Remove deprecated slapd.replog(5) reference in manpages
by fumiyas＠osstech.co.jp 04 Apr '13

04 Apr '13

Full_Name: SATOH Fumiyasu Version: master OS: URL: https://gist.github.com/fumiyas/5316077 Submission from: (NULL) (219.111.105.97) Some manpages refer deprecated slapd.replog(5).

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(ITS#7561) mdb_drop bugs
by h.b.furuseth＠usit.uio.no 04 Apr '13

04 Apr '13

Full_Name: Hallvard B Furuseth Version: mdb.master 8eef7a4275eda8f2fa2e0d1e67c1d5cbcd91607e OS: Linux x86_64 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (193.69.163.163) Submitted by: hallvard mdb_drop() does not seem to return overflow pages to the freelist. Does not call cursor_del or anything, nor 'ovpages' loop like it has. E.g. the enclosed program which writes some pages and then drops the DB shows 59 free of 62 useed pages with non-overflows, but just 3 free of 38-39 with overflows. #include <lmdb.h> #include <assert.h> #include <stdio.h> #include <stdlib.h> int main(void) { MDB_env *env; MDB_txn *txn; MDB_dbi dbi; int rc, sz, sum; # define DBPATH "test.mdb" # define E(e) ((void) (rc = (e)), assert(!rc)) for (sz = 1500; sz < 9000; sz *= 2) { MDB_val key = {sizeof(sum), &sum}, data = {sz, NULL}; printf("======== datasize %d ========\n", sz); fflush(NULL); remove(DBPATH); E(mdb_env_create(&env)); E(mdb_env_set_maxdbs(env, 1)); E(mdb_env_open(env, DBPATH, MDB_NOSUBDIR, 0666)); E(mdb_txn_begin(env, 0, 0, &txn)); { E(mdb_dbi_open(txn, "foo", MDB_CREATE, &dbi)); for (sum = 0; (sum += sz) < 100000; ) E(mdb_put(txn, dbi, &key, &data, MDB_RESERVE)); E(mdb_txn_commit(txn)); } E(mdb_txn_begin(env, 0, 0, &txn)); { E(mdb_drop(txn, dbi, 1)); E(mdb_txn_commit(txn)); } mdb_env_close(env); system("../mdb_stat -naef " DBPATH " | grep -v ': 0$'"); } return 0; }

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