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Re: [Maria-developers] Please fix: innodb_plugin.innodb_gis fails on 'gcov' builder
by Sergei Petrunia 14 Dec '11

14 Dec '11

Hi Alexey, We have a repeatable failure like this: https://internal.askmonty.org/buildbot/builders/gcov/builds/830/steps/test_… innodb_plugin.innodb_gis w3 [ fail ] Test ended at 2011-12-14 06:52:31 CURRENT_TEST: innodb_plugin.innodb_gis mysqltest: At line 1: query 'SET storage_engine=innodb' failed: 1286: Unknown table engine 'innodb' The result from queries just before the failure was: SET storage_engine=innodb; - saving '/home/buildbot/buildbot_basedir/perpush-gcov/build/mysql-test/var/3/log/innodb_plugin.innodb_gis/' to '/home/buildbot/buildbot_basedir/perpush-gcov/build/mysql-test/var/log/innodb_plugin.innodb_gis/' It's in GIS, so I assume it is on your turf. Could you please fix this? BR Sergei -- Sergei Petrunia, Software Developer Monty Program AB, http://askmonty.org Blog: http://s.petrunia.net/blog

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Re: [Maria-developers] Please do a test of 5.3 with these new @@optimizer_switch settings
by Sergei Petrunia 14 Dec '11

14 Dec '11

Hi Elena, On Thu, Dec 08, 2011 at 06:29:01AM +0400, Elena Stepanova wrote: > I tried to set them run overnight, but it isn't going too well. Most of > tests are crashing, see https://bugs.launchpad.net/maria/+bug/901506 . > This bug is finally fixed and pushed. Could you please run more tests on the fix asap? BR Sergei -- Sergei Petrunia, Software Developer Monty Program AB, http://askmonty.org Blog: http://s.petrunia.net/blog

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Re: [Maria-developers] Compilation problem on an old 32-bit machine
by Kristian Nielsen 12 Dec '11

12 Dec '11

Hi Paul, It seems a patch is needed for PBXT to build on 32-bit x86 in some cases: Elena Stepanova <elenst(a)montyprogram.com> writes: > lock_xt.h: Assembler messages: > lock_xt.h:70: Error: bad register name `%sil' > After some re-installation and long digging, I found the ancient bug > report http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10153 which gets > re-filed regularly, the last time was a few months ago. They say it's > a code problem, and suggest replacing the '=r' constraint with '=q'. I > did so in all 4 lines that gcc complained about, and finally got it > work. It seems correct to me that the "q" constraint must be used rather than "r" for the 8-bit case. Below patch should do it (we will apply this in MariaDB). - Kristian. === modified file 'storage/pbxt/src/lock_xt.h' --- storage/pbxt/src/lock_xt.h 2010-05-06 12:57:15 +0000 +++ storage/pbxt/src/lock_xt.h 2011-12-12 11:34:54 +0000 @@ -67,9 +67,9 @@ inline void xt_atomic_inc1(volatile xtWo #elif defined(XT_ATOMIC_GNUC_X86) xtWord1 val; - asm volatile ("movb %1,%0" : "=r" (val) : "m" (*mptr) : "memory"); + asm volatile ("movb %1,%0" : "=q" (val) : "m" (*mptr) : "memory"); val++; - asm volatile ("xchgb %1,%0" : "=r" (val) : "m" (*mptr), "0" (val) : "memory"); + asm volatile ("xchgb %1,%0" : "=q" (val) : "m" (*mptr), "0" (val) : "memory"); #elif defined(XT_ATOMIC_SOLARIS_LIB) atomic_inc_8(mptr); #else @@ -91,9 +91,9 @@ inline xtWord1 xt_atomic_dec1(volatile x #elif defined(XT_ATOMIC_GNUC_X86) xtWord1 val2; - asm volatile ("movb %1, %0" : "=r" (val) : "m" (*mptr) : "memory"); + asm volatile ("movb %1, %0" : "=q" (val) : "m" (*mptr) : "memory"); val--; - asm volatile ("xchgb %1,%0" : "=r" (val2) : "m" (*mptr), "0" (val) : "memory"); + asm volatile ("xchgb %1,%0" : "=q" (val2) : "m" (*mptr), "0" (val) : "memory"); /* Should work, but compiler makes a mistake? * asm volatile ("xchgb %1, %0" : : "r" (val), "m" (*mptr) : "memory"); */

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Re: [Maria-developers] Please fix: gis-precise crashes on solaris
by Alexey Botchkov 12 Dec '11

12 Dec '11

Hi, Adam. Yes i need the access to the machine. Wasn't able to figure out what's wrong by looking at the traces. The crashing query is probably the most trivial of them all. Regards HF 10.12.2011 15:29, Adam M Dutko wrote: > > Let me know if you need access to the machine and I will coordinate > off-list. > > -Adam > >

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[Maria-developers] WL#246 New (by Wlad): Threadpool
by worklog-noreply＠askmonty.org 10 Dec '11

10 Dec '11

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Threadpool CREATION DATE..: Fri, 09 Dec 2011, 22:23 SUPERVISOR.....: IMPLEMENTOR....: Wlad COPIES TO......: CATEGORY.......: Server-BackLog TASK ID........: 246 (http://askmonty.org/worklog/?tid=246) VERSION........: Maria-2.0 STATUS.........: In-Progress PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 300 (hours remain) ORIG. ESTIMATE.: 300 PROGRESS NOTES: DESCRIPTION: Implement a dynamic thread pool, which provides good (superior compared to thread-per-connection) performance for short queries and many threads and does not block on on long queries. ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v4.0.0)

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[Maria-developers] Please fix: gis-precise crashes on solaris
by Sergei Petrunia 09 Dec '11

09 Dec '11

Hi Alexey, I'm looking at 5.3 tree and see main.gis-precise to repeatably crash on solaris: http://buildbot.askmonty.org/buildbot/builders/sol-sparc-32/builds/1518/ste… We don't have a solaris machine but the test failure has a stack trace. Could you please look into this? BR Sergei -- Sergei Petrunia, Software Developer Monty Program AB, http://askmonty.org Blog: http://s.petrunia.net/blog

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[Maria-developers] Please do a test of 5.3 with these new @@optimizer_switch settings
by Sergei Petrunia 08 Dec '11

08 Dec '11

Hi Elena, We're going to make the following enabled by default: @@optimizer_switch='semijoin_with_cache=on,outer_join_with_cache=on' @@join_cache_level=2 Could you please make a test run with these settings? It is important to test revision>=3337 (just pushed it), because it has a change in the optimizer which makes it choose semijoin+join_cache execution plans much more often. BR Sergei -- Sergei Petrunia, Software Developer Monty Program AB, http://askmonty.org Blog: http://s.petrunia.net/blog

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[Maria-developers] WL#245 New (by Sanja): EXISTS to IN transformation
by worklog-noreply＠askmonty.org 07 Dec '11

07 Dec '11

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: EXISTS to IN transformation CREATION DATE..: Wed, 07 Dec 2011, 12:51 SUPERVISOR.....: IMPLEMENTOR....: COPIES TO......: CATEGORY.......: Client-BackLog TASK ID........: 245 (http://askmonty.org/worklog/?tid=245) VERSION........: Benchmarks-3.0 STATUS.........: Un-Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 0 (hours remain) ORIG. ESTIMATE.: 0 PROGRESS NOTES: DESCRIPTION: Transform queries like: ... WHERE EXISTS (SELECT 1 FROM inner_table WHERE inner_table.field = 2*outer_table.field AND maybe_something_else)... and ... WHERE NOT EXISTS (SELECT 1 FROM inner_table WHERE inner_table.field = 2*outer_table.field AND maybe_something_else)... into ... WHERE 2*outer_table.field IN (SELECT inner_table.field FROM inner_table WHERE 1 = 1 AND maybe_something_else).. ... WHERE 2*outer_table.field IS NULL OR 2*outer_table.field IN (SELECT inner_table.field FROM inner_table WHERE inner_table.field IS NOT NULL AND maybe_something_else).. To allow optimizations made for IN/ALL/ANY subqueries. Conversion is possible only if: 1)real NULL is not important (top element of WHERE/ON AND/OR list, i.e. NULL equal to FALSE) 2)the subquery has the only dependence which we bring out of it 3)the subquery is simple (has no aggregate function, GROUp BY, ORDER BY, LIMIT HAVING and so on) For NOT EXISTS conversion the subquery should be marked that its left part can't be NULL. ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v4.0.0)

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[Maria-developers] No coverage for cases where materialization failed to create temptable?
by Sergei Petrunia 06 Dec '11

06 Dec '11

Hi Timour, I was working on BUG#868908, which involves having different kind of handling for cases where Materialization is not applicable because temp table had the wrong properties. So, I've set a goal to catch such cases: === modified file 'sql/item_subselect.cc' --- sql/item_subselect.cc 2011-12-06 21:03:00 +0000 +++ sql/item_subselect.cc 2011-12-06 21:11:16 +0000 @@ -4182,6 +4182,8 @@ bool subselect_hash_sj_engine::init(List */ if (tmp_table->s->keys == 0) { + //fprintf(stderr, "Q: %s\n", current_thd->query()); + DBUG_ASSERT(0); DBUG_ASSERT( tmp_table->s->uniques || tmp_table->key_info->key_length >= tmp_table->file->max_key_length() || Surprisingly, running mysql-test-run t/subselect*.test with this didn't produce any failures. Is this poor test coverage? Or, this branch is now deadcode? BR Sergei -- Sergei Petrunia, Software Developer Monty Program AB, http://askmonty.org Blog: http://s.petrunia.net/blog

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[Maria-developers] Tools/suggestions for MySQL 5.6 merge
by Kristian Nielsen 06 Dec '11

06 Dec '11

I have been doing a bit of preparation/planning for the upcoming merge of MySQL 5.6. I think the 5.6 merge (and 5.5 merge) is very important for MariaDB. There is much stuff in there that we really need to make available to our users (and probably some better left out). If we fail to keep the merges going, it will leave the community in a very sorry situation; I do not see anyone else stepping up to this task. My idea is that we could merge MySQL 5.6 piece-by-piece. Several other developers mentioned this idea at the Athens meeting: - It makes it much easier to selectively merge or not merge stuff. For example there are probably large chunks of optimiser changes that we do not want to merge (or maybe merge only the testcases for). On the other hand we probably want all InnoDB stuff. - I am hopeful it makes the merge much more managable when done in smaller pieces. Large reorganisations of code (header refactoring, copyright changes) should be easier when not intermixed with other changes. Merges from MySQL 5.5 -> MySQL 5.6 are probably also easier to deal with when done in isolation (I assume we can get conflicts for these, though we already have the equivalent changes in MariaDB 5.5). - Easier to share the task between developers. One developer can do a single piece in a few days, then pass the baton when he needs to switch to other tasks (or just gets tired). Complex merges of large feature pushes can be null-merged to allow main merge to progress, and in parallel another developer can work on reworking the patch into the MariaDB code. For some changes I think we will even be able to do the actual merge in parallel. - Easier to plan and understand how far the merge is progressing. Eg. if we merge M weeks worth of 5.6 pushes every N days, that allows to estimate when we will catch up with Oracle development - Easier debugging of test failures; by keeping the trees green between pieces merged, new test failures will be known to be caused by relatively smaller sets of changes, simplifying debugging. I have done some work to facilitate this kind of piecewise merge. As it turns out, it is not trivial to determine suitable pieces to merge. Oracle developers use no discipline for the direction they do merges in, so the sequence of pushes into lp:mysql-server ("trunk") is not immediately apparent. So I took the time to reconstruct the list of pushes from reading through the history; this was not overly hard to do. I next wrote a script that scans the history based on this list of pushes, and further annotates each push with some useful information: - Size of diff for the patch - Number of changesets merged (if a merge) - Mark if this is a merge from MySQL 5.5 - One-line short comment for the push, either hand-crafted for selected items, or else extracted from the commit message. - Revision ID (including developer info) It should be fairly simple to scan this list from the bottom, collecting chunks of related or manageable pushes and merging them as one piece. Eg. A sequence of small pushes could be merged as one, or a sequence of pushes by one developer, or a single large feature push. Here is an example extract of such an annotated list: 0 2* tor.didriksen(a)oracle.com-20111101065343-ha3d79h1ayk9j7x9 [5.5] Null merge from 5.1/5.5 13 andrei.elkin(a)oracle.com-20111031135232-q13pfsaieo8ujekj Minor test adjustment 791 alexander.nozdrin(a)oracle.com-20111031115220-01la8vj7ssmcm0mc Bug#61392 0 2* tor.didriksen(a)oracle.com-20111031091354-8p6s03s1zxerrp8p [5.5] Null merge Bug#12406055 from 5.1/5.5 5380 15 jorgen.loland(a)oracle.com-20111031081122-dnufl9r4li0i3ni6 [opt] Larger merge from optimiser tree 134 2* andrei.elkin(a)oracle.com-20111028212219-cdcuh37i70k9o4ms [5.5] Merge Bug#56299 (?) from 5.5 451 2 andrei.elkin(a)oracle.com-20111028130851-mz4p2mg28y14wb7k merge from trunk to local tree. 43 sergey.glukhov(a)oracle.com-20111028094528-enre87osw9u4qjy7 [opt] Bug#32254 post-merge fix (optimiser) 48 tor.didriksen(a)oracle.com-20111028092548-a3gjubgmwuhdunfj Bug#11747423 post-merge fix 114 tor.didriksen(a)oracle.com-20111028091835-xqavfrxkc50gbsxq "Default value for sort_buffer_size changed from 2M to 256K" The first column is diff size, the second is number of changesets merged (or empty for non-merge changesets). A "*" marks pushes that are only merges from MySQL 5.5. I pushed the script to lp:mariadb-tools, in /mysql-5.6-merge-stuff/. It also includes the full output in 5.6-annotated.txt (it takes 15-20 minutes for bzr to chew through the history on a fast multi-core machine). I hope this will be useful for the merge. Comments/suggestions/questions very welcome! - Kristian.

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