Horton

Re: PATCH: logical_work_mem and logical streaming of large in-progress transactions

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: Dilip Kumar <dilipbalaut@gmail.com>
Cc: Kuntal Ghosh <kuntalghosh.2007@gmail.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, Michael Paquier <michael@paquier.xyz>, Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2020-04-14T10:27:26Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Tighten the concurrent abort check during decoding.

  2. Improve hash_create()'s API for some added robustness.

  3. Use HASH_BLOBS for xidhash.

  4. Fix initialization of RelationSyncEntry for streaming transactions.

  5. Remove unused function declaration in logicalproto.h.

  6. Add additional tests to test streaming of in-progress transactions.

  7. Fix inline marking introduced in commit 464824323e.

  8. Add support for streaming to built-in logical replication.

  9. Fix the SharedFileSetUnregister API.

  10. Fix comment in procarray.c

  11. Suppress compiler warning in non-cassert builds.

  12. Extend the BufFile interface.

  13. Mark a few logical decoding related variables with PGDLLIMPORT.

  14. Implement streaming mode in ReorderBuffer.

  15. Extend the logical decoding output plugin API with stream methods.

  16. WAL Log invalidations at command end with wal_level=logical.

  17. Immediately WAL-log subtransaction and top-level XID association.

  18. Allow logical replication to transfer data in binary format.

  19. Only superuser can set sslcert/sslkey in postgres_fdw user mappings

  20. Track statistics for spilling of changes from ReorderBuffer.

  21. Add logical_decoding_work_mem to limit ReorderBuffer memory usage.

  22. logical decoding: process ASSIGNMENT during snapshot build

  23. Emit invalidations to standby for transactions without xid.

On Tue, Apr 14, 2020 at 3:41 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
>
>
> >
> > > @@ -281,6 +281,24 @@ DecodeXactOp(LogicalDecodingContext *ctx,
> > > XLogRecordBuffer *buf)
> > >   }
> > >   case XLOG_XACT_ASSIGNMENT:
> > >   break;
> > > + case XLOG_XACT_INVALIDATIONS:
> > > + {
> > > + TransactionId xid;
> > > + xl_xact_invalidations *invals;
> > > +
> > > + xid = XLogRecGetXid(r);
> > > + invals = (xl_xact_invalidations *) XLogRecGetData(r);
> > > +
> > > + if (!TransactionIdIsValid(xid))
> > > + break;
> > > +
> > > + ReorderBufferAddInvalidation(reorder, xid, buf->origptr,
> > > + invals->nmsgs, invals->msgs);
> > >
> > > Why should we insert an WAL record for such cases?
> > >
> >
> > Right, if there is any such case, we should avoid it.
>
> I think we don't have any such case because we are logging at the
> command end.  So I have created an assert instead of the check.
>

Have you tried to ensure this in some way?  One idea could be to add
an Assert (to check if transaction id is assigned) in the new code
where you are writing WAL for this action and then run make
check-world and or make installcheck-world.

-- 
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com