Horton

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

Dilip Kumar <dilipbalaut@gmail.com>

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From: Dilip Kumar <dilipbalaut@gmail.com>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: Erik Rijkers <er@xs4all.nl>, 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: 2020-07-15T03:59:03Z
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.

Attachments

On Tue, Jul 14, 2020 at 5:40 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> On Mon, Jul 13, 2020 at 4:09 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
> >
> > On Mon, Jul 13, 2020 at 4:00 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
> > >
> > >
> > > Okay, in that case, we can do both enable and disable streaming in
> > > this function itself rather than allow the caller to later modify it.
> > > I suggest similarly we can enable/disable it for SQL API in
> > > pg_decode_startup via output_plugin_options.  This way it will look
> > > consistent for both SQL APIs and for command-based replication.  If we
> > > can do so, then probably adding an Assert for Consistent Snapshot
> > > while performing streaming should be okay.
> >
> > Sounds good to me.
> >
>
> Please find the latest patches.  I have made changes only in the
> subscriber-side patches (0007 and 0008 as per the current patch-set).
> The main changes are:
> 1. As discussed above, remove SendFeedback call from apply_handle_stream_commit
> 2. In SharedFilesetInit, ensure to register callback once
> 3. In stream_open_file, change slight handling around MemoryContexts
> 4. Merged the subscriber-side patches.
> 5. Added/Edited comments in 0007 and 0008.

I have reviewed your changes and those look good to me,  please find
the latest version of the patch set.  The major changes
- A couple of review comments fixed suggested upthread in 0003 and 0005.
- Handle the case of stop streaming until we reach to the
start_decoding_at LSN in 0005
- Simplified the 0006 by avoiding sending the transaction with
incomplete changes and added the comment atop
ReorderBufferLargestTopTXN
- Moved 0010 as 0007 and handled pending comments in the same.
- In 0009 I have fixed a couple of defects mentioned above.  And, one
additional defect that is,  if we do alter subscription streaming
off/on then it was not working.
- In 0009 sending the origin id.

-- 
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com