openldap-bugs

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20960 discussions

Re: (ITS#7829) MDB mdb_cursor_del causes records to be skipped
by hyc＠symas.com 28 Mar '14

28 Mar '14

armon.dadgar(a)gmail.com wrote: > Full_Name: Armon Dadgar > Version: > OS: > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (50.78.97.10) > > > I have an issue where when iterating over data and deleting keys, the cursor > will incorrectly skip rows, and then returns an early NOTFOUND even though more > records still exist. > > I have a gist demonstrating this: https://gist.github.com/armon/9825666 > > I am using small Go wrapper around LMDB, version 0.9.11. > > The expected behavior is to numbers 1..91 printed. However, when I run it, > it gets to 16 and returns no further rows. > > Thanks for the report. Fixed now in mdb.master. -- -- 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#7825) LMDB: misleading error message
by timur.kristof＠gmail.com 28 Mar '14

28 Mar '14

On Fri Mar 28 2014 18:36:11 GMT+0100 (CET), Howard Chu wrote: > timur.kristof(a)gmail.com wrote: > > > Here's a small test case which will demonstrate it: > > http://pastebin.com/hHwD1srf > > As an aside, this is some pretty horrible code. Why are you using > MDB_GET_CURRENT after all of your cursor_get calls? It truly is horrendous. I wrote it in an attempt to (roughly) reproduce what one of my examples did in javascript. Then when I discovered what the issue really was, I forgot to clean it up before pastebinning. I hope it's still okay as a testcase for this bugreport :) > -- Howard Chu > CTO, Symas Corp. http://www.symas.com > Director, Highland Sun http://highlandsun.com/hyc/ > Chief Architect, OpenLDAP http://www.openldap.org/project/ > -- Timur Sent from my Jolla

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Re: (ITS#7825) LMDB: misleading error message
by hyc＠symas.com 28 Mar '14

28 Mar '14

timur.kristof(a)gmail.com wrote: > Here's a small test case which will demonstrate it: > http://pastebin.com/hHwD1srf As an aside, this is some pretty horrible code. Why are you using MDB_GET_CURRENT after all of your cursor_get calls? -- -- 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#7830) MDB Size grown a lot during massive updates and concurrent read access
by antonin.meunier＠cgi.com 28 Mar '14

28 Mar '14

Full_Name: Antonin Meunier Version: 2.4.39 OS: Red Hat 6.5 URL: Submission from: (NULL) (195.6.127.108) Ldap is set to a maximum MDB database size of 80GB. Ldap uses 20GB of effective Size. There are approximately 60 index , 1500000 peoples and 4500000 groups. The LDAP is accessed in read / write by about 20 tomcat. In parallel to this, update treatment (inject ldif) are started performing lots of massive upates (750 000, 500 000 groups). When processing the massives updates, the MDB size increases to the 80max and therefore the treatment plant updates. If I stop all tomcat, the problem no longer occurs. So it seems that the problem comes from locks that are placed on the pages of indexes and data by readers and force to create new pages for changes with conservation of all intermediate pages. After that, the only way to find a "normal" size is to export the ldap , delete it and re-import the backup. The LDAP database is then again 20GB

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Re: (ITS#7828) LMDB crash in mdb_cursor_put(MDB_CURRENT)
by sbn＠tbricks.com 28 Mar '14

28 Mar '14

Works after reverting commit (checked f537429) Thanks!

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(ITS#7829) MDB mdb_cursor_del causes records to be skipped
by armon.dadgar＠gmail.com 28 Mar '14

28 Mar '14

Full_Name: Armon Dadgar Version: OS: URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (50.78.97.10) I have an issue where when iterating over data and deleting keys, the cursor will incorrectly skip rows, and then returns an early NOTFOUND even though more records still exist. I have a gist demonstrating this: https://gist.github.com/armon/9825666 I am using small Go wrapper around LMDB, version 0.9.11. The expected behavior is to numbers 1..91 printed. However, when I run it, it gets to 16 and returns no further rows.

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Re: (ITS#7828) LMDB crash in mdb_cursor_put(MDB_CURRENT)
by hyc＠symas.com 26 Mar '14

26 Mar '14

h.b.furuseth(a)usit.uio.no wrote: > Doc bug, fixed recently: MDB_CURRENT must not change the data size. Wrong. This is a regression due to ITS#7793. That commit has now been reverted. > Also with DUPSORT the data item must sort in the same place as the > previous one, that needs to be documented too. I'll add this note to the doc. -- -- 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#7826)
by antonin.meunier＠cgi.com 26 Mar '14

26 Mar '14

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1 0

Re: (ITS#7828) LMDB crash in mdb_cursor_put(MDB_CURRENT)
by h.b.furuseth＠usit.uio.no 26 Mar '14

26 Mar '14

Doc bug, fixed recently: MDB_CURRENT must not change the data size. Also with DUPSORT the data item must sort in the same place as the previous one, that needs to be documented too.

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Re: (ITS#7825) LMDB: misleading error message
by timur.kristof＠gmail.com 26 Mar '14

26 Mar '14

--001a11c13346e990f604f57e2991 Content-Type: text/plain; charset=UTF-8 Hi, For further information, see the discussion here: https://github.com/Venemo/node-lmdb/pull/20 We genuinely thought that there had been something wrong with our value sizes somewhere, so I wasted several hours debugging in the wrong place. Then, by accident I discovered that it's in fact an issue with V8's GC. I definitely suggest to choose one of the solutions that don't cost any execution time when there is no error. Perhaps mdb_dbi_close could return an error (or crash) when the dbi is still used by a cursor. That'd eliminate the issue but it'd also mean an API/ABI break. Best regards, Timur On Tue, Mar 25, 2014 at 10:37 AM, Hallvard Breien Furuseth < h.b.furuseth(a)usit.uio.no> wrote: > On Sat, 2014-03-22 at 22:49 +0000, timur.kristof(a)gmail.com wrote: > > When you operate on a dbi using a cursor and accidentally close the dbi > before > > committing the transaction of the cursor, mdb_txn_commit will return > > MDB_BAD_VALSIZE. This is quite misleading because the problem doesn't > actually > > have anything to do with what the error message suggests. ("Too big > key/data, > > key is empty, or wrong DUPFIXED size") > > > > I suggest to either add a new kind of error code for this situation or > to extend > > the description of MDB_BAD_VALSIZE. > > Let's see -- here are the options I can see (after an IRC chat): > > 1) Extending the MDB_BAD_VALSIZE description. Simple. However: > > This is documented as a user error, and it's one which lmdb > won't always catch. If you also called mdb_dbi_open() and the > DBI got reused, lmdb silently updates the wrong named database. > > So I'm a bit wary about both of these fixes: Documenting this > case can be misleading if it makes users expect it to be caught. > > Unless people know better - it corresponds to EBADF for using a > closed file descriptor, not caught if open() reused it. > > > 2) Catch this case and instead return a generic "something is > wrong" - MDB_BAD_TXN or MDB_INCOMPATIBLE. > And maybe assert(did not happen) to teach users to avoid this. > > Needs to be done where md_name is used: Commit/drop(named DB), > page_search(stale named DB), cursor_touch(clean named DB). Or > pass F_SUBDATA inwards and tweak the "return MDB_BAD_VALSIZE" > statements to detect this. > > After playing around a bit, I guess this is my favorite. > > > 3) Leave the misleading message alone, which can send the user > off to a wild goose chase (as described on IRC). > > > Or we can add code to also catch close followed by open: > > 4) Put hash(DB name) in MDB_db.md_pad and verify it before > overwriting a named DB. Costs execution time even when there's > no error. Must be done in commit, drop and maybe cursor_touch. > (I've pushed a demo patch for just commit.) > > 5) Add field MDB_dbx.md_dbiseq = DBI usage sequence number, > incremented when dbi_open creates (not reuses) a DBI and in > dbi_close. Copy it to a new malloced array txn->mt_dbiseqs[] > in write txns, verify it in at least commit and drop. > This means close()-open(same DB) will also be caught, which > seems a good thing since with (4) it will work unreliably: > Only if open() reuses the same DBI for the same DB. > --001a11c13346e990f604f57e2991 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div><div>Hi,<br><br>For further information, see the disc= ussion here: <a href=3D"https://github.com/Venemo/node-lmdb/pull/20">https:= //github.com/Venemo/node-lmdb/pull/20</a><br></div><div>We genuinely though= t that there had been something wrong with our value sizes somewhere, so I = wasted several hours debugging in the wrong place. Then, by accident I disc= overed that it's in fact an issue with V8's GC.<br> </div><div><br>I definitely suggest to choose one of the solutions that don= 't cost any execution time when there is no error. <br><br></div>Perhap= s mdb_dbi_close could return an error (or crash) when the dbi is still used= by a cursor. That'd eliminate the issue but it'd also mean an API/= ABI break.<br> <br></div>Best regards,<br>Timur<br><div><div><br><br></div></div></div><di= v class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Tue, Mar 25, = 2014 at 10:37 AM, Hallvard Breien Furuseth <span dir=3D"ltr"><<a href=3D= "mailto:h.b.furuseth@usit.uio.no" target=3D"_blank">h.b.furuseth(a)usit.uio.n= o</a>></span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p= x #ccc solid;padding-left:1ex">On Sat, 2014-03-22 at 22:49 +0000, <a href= =3D"mailto:timur.kristof@gmail.com">timur.kristof(a)gmail.com</a> wrote:<br> > When you operate on a dbi using a cursor and accidentally close the db= i before<br> > committing the transaction of the cursor, mdb_txn_commit will return<b= r> > MDB_BAD_VALSIZE. This is quite misleading because the problem doesn&#3= 9;t actually<br> > have anything to do with what the error message suggests. ("Too b= ig key/data,<br> > key is empty, or wrong DUPFIXED size")<br> ><br> > I suggest to either add a new kind of error code for this situation or= to extend<br> > the description of MDB_BAD_VALSIZE.<br> <br> Let's see -- here are the options I can see (after an IRC chat):<br> <br> 1) Extending the MDB_BAD_VALSIZE description. Simple. However:<br> <br> This is documented as a user error, and it's one which lmdb<br> won't always catch. =C2=A0If you also called mdb_dbi_open() and the<br> DBI got reused, lmdb silently updates the wrong named database.<br> <br> So I'm a bit wary about both of these fixes: Documenting this<br> case can be misleading if it makes users expect it to be caught.<br> <br> Unless people know better - it corresponds to EBADF for using a<br> closed file descriptor, not caught if open() reused it.<br> <br> <br> 2) Catch this case and instead return a generic "something is<br> wrong" - MDB_BAD_TXN or MDB_INCOMPATIBLE.<br> And maybe assert(did not happen) to teach users to avoid this.<br> <br> Needs to be done where md_name is used: Commit/drop(named DB),<br> page_search(stale named DB), cursor_touch(clean named DB). =C2=A0Or<br> pass F_SUBDATA inwards and tweak the "return MDB_BAD_VALSIZE"<br> statements to detect this.<br> <br> After playing around a bit, I guess this is my favorite.<br> <br> <br> 3) Leave the misleading message alone, which can send the user<br> off to a wild goose chase (as described on IRC).<br> <br> <br> Or we can add code to also catch close followed by open:<br> <br> 4) Put hash(DB name) in MDB_db.md_pad and verify it before<br> overwriting a named DB. =C2=A0Costs execution time even when there's<br= > no error. =C2=A0Must be done in commit, drop and maybe cursor_touch.<br> (I've pushed a demo patch for just commit.)<br> <br> 5) Add field MDB_dbx.md_dbiseq =3D DBI usage sequence number,<br> incremented when dbi_open creates (not reuses) a DBI and in<br> dbi_close. =C2=A0Copy it to a new malloced array txn->mt_dbiseqs[]<br> in write txns, verify it in at least commit and drop.<br> This means close()-open(same DB) will also be caught, which<br> seems a good thing since with (4) it will work unreliably:<br> Only if open() reuses the same DBI for the same DB.<br> </blockquote></div><br></div> --001a11c13346e990f604f57e2991--

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