Re: Patch queue triage
От | Bruce Momjian |
---|---|
Тема | Re: Patch queue triage |
Дата | |
Msg-id | 200709122147.l8CLll220760@momjian.us обсуждение исходный текст |
Ответ на | Patch queue triage (Tom Lane <tgl@sss.pgh.pa.us>) |
Ответы |
Re: Patch queue triage
("Pavan Deolasee" <pavan.deolasee@gmail.com>)
Re: Patch queue triage (Simon Riggs <simon@2ndquadrant.com>) |
Список | pgsql-hackers |
For those who have forgotten the progress we have made toward 8.3, here are the open patches we had for 8.3 as of May 1, 2006: --------------------------------------------------------------------------- Tom Lane wrote: > Bruce Momjian <bruce@momjian.us> writes: > > FYI, Tom, Heikki, I need one of you to post the list of patches and > > where we think we are on each one, even if the list is imperfect. > > This message is an attempt to sort out which patch queue entries have > no hope of getting into 8.3 (and so we shouldn't spend more time on them > right now), which ones can get in but are waiting on their authors for > more work, and which ones are ready for immediate review. > > You'll notice that numerically quite a lot of the patches fall into the > "dead" category. This isn't actually all that surprising because if > they were apply-able they'd have gotten in. (It's not like we've > completely neglected applying patches for the last six months...) > However, many of the remaining live patches are huge ones, like HOT and > delayed commit, and are going to consume considerable review effort > (again, if they didn't, they might have been in already). > > The bottom line is that we are desperately in need of more review > manpower. I'm pleased to report that Heikki Linnakangas has promised to > devote most of the next few weeks to helping review, and has already > picked out some patches he feels qualified to work on, as you'll see > below. I have also been coordinating reviewing assignments off-list with > Neil and Magnus to avoid duplication of effort. But I'd like to encourage > everyone who's done any backend hacking to look at the live patches not > shown as assigned to someone specific. The more eyeballs the better; > anything you catch is something someone else might miss. Also, several > of the open patches are in need of more performance testing, so if you > can help out in that fashion please do so. > > With that, the patches: > > > * Re: [pgsql-patches] [PATCHES] [HACKERS] [Fwd: Index Advisor] > /Gurjeet Singh/ > > I don't think this can be applied in anything like its current state. > The internal interface to the planner is not very good, and ditto for the > user API. What I would suggest trying to do is get a set of plugin hooks > defined for the planner that would allow the advisor to be implemented > entirely as an external module, and then let it be worked on as a > pgfoundry project. I have some ideas about appropriate design of the > plugin hooks (as mentioned in my review message of a month ago), but I > have to say that getting that done for 8.3 is lower-priority than some of > the other patches. > > * [pgsql-patches] Ctid chain following enhancement > /Pavan Deolasee/ > > I'm not very excited about this --- it seems to me to complicate the code > in some places that are not in fact performance-critical. While it > doesn't seem likely to break things, I'm not in favor of reducing code > readability unless a measurable performance improvement can be shown. > Can we have some tests showing this is worthwhile? > > * [PATCHES] Error correction for n_dead_tuples > /ITAGAKI Takahiro/ > > Waiting for OldestXmin patch to be accepted or rejected. However, > regardless of the fate of that patch, I'm concerned that this one creates > an open-loop behavior in which the n_dead_tuples estimate will diverge > arbitrarily far from reality over time. I criticized the original > proposal on that basis, and I'm not convinced this version fixes it, > because of the fact that stats counter updates occur much later than the > actions they count. (My recent patch to rate-limit tabstat messages made > that problem worse, but it existed anyway.) What might make sense is for > vacuum to count the number of dead-but-not-removable tuples it skips over, > and apply that as the value of n_dead_tuples on receipt of the vacuum > message (instead of setting to zero as now). This is likely to be wrong > with respect to the actions of transactions running concurrently with the > vacuum, but I think so is the proposed patch; and at least in this form > the error certainly cannot accumulate across vacuum cycles. > > * [PATCHES] Table function support /Pavel Stehule/ > > Neil has promised to review this. AFAIK there are no showstoppers but > there are some disagreements on the details of the functionality. > > * [HACKERS] Grouped Index Tuples /Heikki Linnakangas/ > * [HACKERS] Grouped Index Tuples / Clustered Indexes > /Heikki Linnakangas/ > > Needs review. I'm not sure how many people besides Heikki have really > looked at this (I know I haven't). > > * Re: [PATCHES] POSIX shared memory support > /Chris Marcellino/ > > I'm not convinced that we want this at all. The original proposal was > to provide an alternative for platforms without SysV shmem support, > but the working versions of the patch fail to remove the SysV dependency, > and the portability of this code is itself quite unproven. Do we really > want to take on maintenance of yet-another shmem implementation just to > let people be lazy about changing their SHMMAX settings? As best I can > tell the main problem in that department is Darwin, and it'd be a whole > lot simpler if Apple just raised their darn default SHMMAX to something > that's sensible for the 21st century. > > [BTW, there was a patch submitted recently to use SysV semaphores instead > of Posix on Darwin versions that have 'em; why isn't that in the queue? > It makes sense to me to do that to save on file descriptors ...] > > * [HACKERS] Automatic adjustment of bgwriter_lru_maxpages (was: > Dead Space Map version 2) /ITAGAKI Takahiro/ > > Heikki is reviewing this. AIUI there are no known showstoppers but > we'd like more performance measurements, plus there are interactions > with other open patches to investigate. > > * [HACKERS] Stream bitmaps /Heikki Linnakangas/ > > I think this is on hold unless a finished bitmap-index patch shows up; > however there was some discussion of using this in support of clustered > indexes, so maybe it's live anyway? Heikki? > > * [PATCHES] Heap page diagnostic/test functions (v2) > /Simon Riggs/ > > Heikki is reviewing this and refactoring it as a contrib module. > > * [PATCHES] non-recursive WITH clause support > /Gregory Stark/ > > I think the consensus is that we should wait for a more complete WITH > implementation to be submitted, since this one creates compatibility > issues without any real return in the form of added functionality. > > * Re: [HACKERS] Bug: Buffer cache is not scan resistant > /Simon Riggs/ > > Heikki is reviewing this one, in conjunction with the sync-scan patch. > Performance testing is needed for both. > > * [PATCHES] Updated bitmap index patch /Gavin Sherry/ > > We're still waiting to see if a finished patch will be submitted. > I'm very close to saying this has to wait for 8.4, though. > > * Re: [HACKERS] [PATCHES] Bitmapscan changes > /Heikki Linnakangas/ > > I had objected to this on the grounds that it seemed to be covering > only a narrow territory between HOT and bitmap indexes, but given the > probability that one or even both of those won't make it, we need to > give this one a second look. So: live, needs review. > > * Re: [PATCHES] Synchronized Scan WIP patch > /Simon Riggs/ > > Heikki is reviewing this one. Also I believe Greg Smith is doing more > performance testing. > > * Re: [HACKERS] [PATCHES] xml2 contrib patch supporting default XML > namespaces /Mike Rylander/ > > I would like to get Peter to deal with this and the other XML-related > patch. > > * [HACKERS] Indexam interface proposal /Heikki Linnakangas/ > > AFAICS this discussion died out with no actual patch submitted. > > * [PATCHES] Load distributed checkpoint V3 > /ITAGAKI Takahiro/ > > Heikki is reviewing this one. More performance testing is needed, > I think. > > * [HACKERS] Group Commit /Heikki Linnakangas/ > > I believe this is on hold for 8.4; in any case it should wait till > after Simon's deferred-commit patch is in and we have more info about > the performance implications of that. > > * [PATCHES] Patch for circular buffer in tuplestore to optimize > merge joins (v1) /stark/ > > I will handle this --- AFAIK there are no showstopper objections. > > * [PATCHES] Concurrent psql v4 [WIP] /stark/ > > This is waiting on the author to change the API per list discussions; we > can't apply something that is about to have some commands removed ... > > * Re: [PATCHES] Recalculating OldestXmin in a long-running vacuum > /Heikki Linnakangas/ > > This is on hold until the other vacuum-related patches are accepted > or rejected; at that point we need to redo the performance tests. > As things stand it should *not* be accepted because the only available > test shows a performance decrease, but maybe that will change after > the other patches go in. (In any case it'd be interesting to find > out why there's no performance improvement, but it seems unlikely > we have time for that investigation for 8.3.) > > * Re: [HACKERS] Modifying TOAST thresholds /Tom Lane/ > > At this point it seems nothing will be done about this issue for 8.3. > > * [PATCHES] plpgpsm /Pavel Stehule/ > > I think this has to be held for 8.4: it was submitted too late for the 8.3 > feature deadline, and in fact I don't recall that there was any community > discussion/consensus on accepting it into core at all. Another big > problem is that it largely copies-and-pastes the plpgsql code, which I > think is an unacceptable maintenance burden in the long run. We need to > consider whether we can't refactor to avoid code duplication. > > * [HACKERS] tsearch_core patch for inclusion > /Teodor Sigaev/ > > Have we resolved whether the API and the dump/restore strategy are > acceptable? The code needs review too, but not till we've settled > on the basic question whether we like the feature set. > > * Re: [PATCHES] [HACKERS] Full page writes improvement, code update > /Koichi Suzuki/ > > I feel that we have to insist that this be modified to not create any WAL > bloat in the pre-compression form. That will be more efficient and will > avoid the whole argument about whether a switch is needed. There was also > doubt about whether the external programs (pg_compresslog etc) were ready > for prime time. At this point we could accept a patch that makes whatever > small tweaks are needed to ensure that an incremental-format WAL record > can be extracted from a full-page-write record, at least for the most > common WAL record types for which compression is actually important. I > think the actual compression/decompression programs could undergo further > development on pgfoundry with an eye to merging them into core before 8.4 > release. > > * [PATCHES] Dead Space Map version 3 (simplified) > /ITAGAKI Takahiro/ > > I want to reject this in its current form. It's been clear almost since > the FSM code was first released to the field that its dependence on a > fixed-size shared memory area was a serious design blunder (one for which > I take full blame; I thought it'd be workable, I was wrong). We can't > sanely take a patch that repeats that mistake. It seems fairly clear that > DSM could be redesigned to be stored in "special space" in every Nth heap > page and thereby avoid the problem. We should do that and look at whether > FSM couldn't be integrated into the same data structure. (I'm not > entirely sure how to handle FSM for indexes in this fashion, but maybe we > should just throw that problem back onto the shoulders of the index AMs; > for instance make them keep linked lists of free index pages.) > Obviously this won't happen for 8.3, but I don't think DSM as it stands > would be a net plus for users. > > * Re: [PATCHES] COPY-able sql log outputs /FAST PostgreSQL/ > > Are we agreed on the API for this? AFAIR there were no showstoppers > but there was some considerable discussion about API details. > > * [PATCHES] Updateable cursors patch /FAST PostgreSQL/ > > This is incomplete, and I fear at this point has to be held over to 8.4. > > * [PATCHES] Preliminary GSSAPI Patches /Henry B. Hotz/ > > Magnus is reviewing this one. > > * [PATCHES] Logging checkpoints and other slowdown causes > /Greg Smith/ > > Heikki is reviewing this one. > > * Re: [PATCHES] [Fwd: Deferred Transactions, Transaction Guarantee > and COMMITwithout waiting] /Simon Riggs/ > > Simon is on the hook to submit an updated patch. I hope this one > makes it in, as it looks like a really nice performance improvement > for those who can use it; but the original patch seems overcomplicated. > > * Re: [HACKERS] Arrays of Complex Types /David Fetter/ > > Waiting on the author to respond to open issues; in particular the > problem of not making array types for system catalogs. > > * Re: [HACKERS] Implicit casts to text /Peter Eisentraut/ > > I had volunteered to finish this, but don't be surprised if it gets > put off till 8.4. > > * Re: [GENERAL] dropping role w/dependent objects > /Ed L./ > > Patch seems ok, comment maybe overkill. Will apply this shortly. > > * Re: [HACKERS] pg_index updates and SI invalidation > /Pavan Deolasee/ > > Needs some review, I don't think there are any showstoppers though. > > * [PATCHES] HOT Patch - Ready for review /Pavan Deolasee/ > > This needs a *lot* of review. Can we break it down into more manageable > chunks? I'm not sure that anyone's got a full grasp of the implications > of this patch, and that's a scary thought. > > * [PATCHES] Minor recovery changes /Simon Riggs/ > > The submission mentions open issues --- when will those be resolved? > Should we apply the patch-so-far anyway? > > * Re: [PATCHES] UTF8MatchText /ITAGAKI Takahiro/ > > I'd like someone who uses UTF8 more than I do to double-check whether this > is sane. Also, can we avoid having so much code duplication between the > various forms of LIKE? > > * [PATCHES] Clear up strxfrm() in UTF-8 with locale on Windows > /ITAGAKI Takahiro/ > > Someone else needs to look at this; I can't test it. Magnus? > > * Re: [PATCHES] xpath_array with namespaces support > /Nikolay Samokhvalov/ > > I would like to get Peter to deal with this and the other XML-related > patch. > > * Re: [PATCHES] CREATE TABLE LIKE INCLUDING INDEXES support > /Trevor Hardcastle/ > > Neil will review this. > > * [PORTS] m32r tas() implementation /Martin Pitt/ > > This lacks a configure probe for sys/tas.h, but I have no other > objection to it. > > * [HACKERS] [PATCH] A crash and subsequent recovery of the master > can cause theslave to get out-of-sync /Florian G. Pflug/ > > This seems like a real problem that needs review. The given patch > was done hastily and might or might not be OK, though. > > * [COMMITTERS] pgsql: Remove some of the most blatant brain-fade in > the recent guc /Tom Lane/ > > The recent guc patch to reset variables when they are removed from > postgresql.conf was broken. Again :-(. It needs to be fixed > or reverted. (Why are we having such problems here? Maybe the > GUC code as a whole is too complex to understand?) > > * [HACKERS] Avoiding unnecessary reads in recovery > /Heikki Linnakangas/ > > I think we need to apply this, or else do something else with the > wired-in assumption about full page writes that was noted in the > discussion. > > * Re: [PATCHES] [HACKERS] autovacuum does not start in HEAD > /ITAGAKI Takahiro/ > > I assume Alvaro will deal with this. > > * Re: [PATCHES] LIMIT/SORT optimization /Gregory Stark/ > * [PATCHES] updated SORT/LIMIT patch /Gregory Stark/ > > I will look at this. I recall being concerned about whether there > wasn't a cleaner way to introduce the required inter-node communication. > > * Re: [PATCHES] New version of GENERATED/IDENTITY, was Re: parser > dilemma /Zoltan Boszormenyi/ > > I reviewed this earlier and can deal with the update. > > > There is one large item that is not in the patch queue at all, because > it's not been written, and that's the change to support per-function > settings of search_path. I think this is critical to get done for 8.3, > but adding a column to pg_proc will create merge issues for any patch that > adds anything to pg_proc, and a lot of the open ones do. So I've been > holding off writing it until more of them are in. I think it's going to > be straightforward so I'm not too worried about the delay, but it needs to > happen. > > regards, tom lane > > ---------------------------(end of broadcast)--------------------------- > TIP 3: Have you checked our extensive FAQ? > > http://www.postgresql.org/docs/faq -- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB http://www.enterprisedb.com + If your life is a hard drive, Christ can be your backup. +
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