Horton

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

Dilip Kumar <dilipbalaut@gmail.com>

View thread
From: Dilip Kumar <dilipbalaut@gmail.com>
To: Kuntal Ghosh <kuntalghosh.2007@gmail.com>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>, Amit Kapila <amit.kapila16@gmail.com>, Michael Paquier <michael@paquier.xyz>, Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2020-04-27T10:34:55Z
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 Fri, Apr 17, 2020 at 1:40 AM Kuntal Ghosh <kuntalghosh.2007@gmail.com> wrote:
>
> On Tue, Apr 14, 2020 at 3:41 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
> >
>
> Few review comments from 0006-Add-support-for-streaming*.patch
>
> + subxacts[nsubxacts].offset = lseek(stream_fd, 0, SEEK_END);
> lseek can return (-)ve value in case of error, right?
>
> + /*
> + * We might need to create the tablespace's tempfile directory, if no
> + * one has yet done so.
> + *
> + * Don't check for error from mkdir; it could fail if the directory
> + * already exists (maybe someone else just did the same thing).  If
> + * it doesn't work then we'll bomb out when opening the file
> + */
> + mkdir(tempdirpath, S_IRWXU);
> If that's the only reason, perhaps we can use something like following:
>
> if (mkdir(tempdirpath, S_IRWXU) < 0 && errno != EEXIST)
> throw error;

Done

>
> +
> + CloseTransientFile(stream_fd);
> Might failed to close the file. We should handle the case.

Changed

Still, one place is pending because I don't have the filename there to
report an error.  One option is we can just give an error without the
filename.  I will try to think about this part.

> Also, I think we need some implementations in dumpSubscription() to
> dump the (streaming = 'on') option.

Right,  created another patch and attached.

I have also fixed a couple of bugs internally reported by my colleague
Neha Sharma.

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