Re: PATCH: logical_work_mem and logical streaming of large in-progress transactions
Dilip Kumar <dilipbalaut@gmail.com>
Commits
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the thread's linked commits as JSON, with link sources.
API reference →
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Tighten the concurrent abort check during decoding.
- 2ce353fc1902 14.0 landed
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Improve hash_create()'s API for some added robustness.
- b3817f5f7746 14.0 landed
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Use HASH_BLOBS for xidhash.
- a1b8aa1e4eec 14.0 landed
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Fix initialization of RelationSyncEntry for streaming transactions.
- 69bd60672af6 14.0 landed
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Remove unused function declaration in logicalproto.h.
- ddd5f6d2609b 14.0 landed
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Add additional tests to test streaming of in-progress transactions.
- 58b5ae9d62bd 14.0 landed
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Fix inline marking introduced in commit 464824323e.
- ac15b499f7f9 14.0 landed
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Add support for streaming to built-in logical replication.
- 464824323e57 14.0 landed
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Fix the SharedFileSetUnregister API.
- 4ab77697f67a 14.0 landed
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Fix comment in procarray.c
- 77c7267c37f7 14.0 cited
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Suppress compiler warning in non-cassert builds.
- e942af7b8261 14.0 cited
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Extend the BufFile interface.
- 808e13b282ef 14.0 landed
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Mark a few logical decoding related variables with PGDLLIMPORT.
- b48cac3b10a0 14.0 landed
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Implement streaming mode in ReorderBuffer.
- 7259736a6e5b 14.0 landed
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Extend the logical decoding output plugin API with stream methods.
- 45fdc9738b36 14.0 landed
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WAL Log invalidations at command end with wal_level=logical.
- c55040ccd017 14.0 landed
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Immediately WAL-log subtransaction and top-level XID association.
- 0bead9af484c 14.0 landed
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Allow logical replication to transfer data in binary format.
- 9de77b545313 14.0 cited
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Only superuser can set sslcert/sslkey in postgres_fdw user mappings
- cebf9d6e6ee1 13.0 cited
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Track statistics for spilling of changes from ReorderBuffer.
- 9290ad198b15 13.0 landed
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Add logical_decoding_work_mem to limit ReorderBuffer memory usage.
- cec2edfa7859 13.0 landed
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logical decoding: process ASSIGNMENT during snapshot build
- bac2fae05c77 13.0 cited
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Emit invalidations to standby for transactions without xid.
- c6ff84b06a68 9.6.0 cited
On Mon, Jun 22, 2020 at 4:30 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> On Mon, Jun 22, 2020 at 4:26 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
> >
> > On Thu, Jun 18, 2020 at 9:02 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
> > >
> > > Yes, I have made the changes. Basically, now I am only using the
> > > XLOG_XACT_INVALIDATIONS for generating all the invalidation messages.
> > > So whenever we are getting the new set of XLOG_XACT_INVALIDATIONS, we
> > > are directly appending it to the txn->invalidations. I have tested
> > > the XLOG_INVALIDATIONS part but while sending this mail I realized
> > > that we could write some automated test for the same.
> > >
> >
> > Can you share how you have tested it?
> >
> > > I will work on
> > > that soon.
> > >
> >
> > Cool, I think having a regression test for this will be a good idea.
> >
>
> Other than above tests, can we somehow verify that the invalidations
> generated at commit time are the same as what we do with this patch?
> We have verified with individual commands but it would be great if we
> can verify for the regression tests.
I have verified this using a few random test cases. For verifying
this I have made some temporary code changes with an assert as shown
below. Basically, on DecodeCommit we call
ReorderBufferAddInvalidations function only for an assert checking.
-void
ReorderBufferAddInvalidations(ReorderBuffer *rb, TransactionId xid,
XLogRecPtr
lsn, Size nmsgs,
-
SharedInvalidationMessage *msgs)
+
SharedInvalidationMessage *msgs, bool commit)
{
ReorderBufferTXN *txn;
txn = ReorderBufferTXNByXid(rb, xid, true, NULL, lsn, true);
-
+ if (commit)
+ {
+ Assert(txn->ninvalidations == nmsgs);
+ return;
+ }
The result is that for a normal local test it works fine. But with
regression suit, it hit an assert at many places because if the
rollback of the subtransaction is involved then at commit time
invalidation messages those are not logged whereas with command time
invalidation those are logged.
As of now, I have only put assert on the count, if we need to verify
the exact messages then we might need to somehow categories the
invalidation messages because the ordering of the messages will not be
the same. For testing this we will have to arrange them by category
i.e relcahce, catcache and then we can compare them.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com