Re: logical decoding : exceeded maxAllocatedDescs for .spill files

Amit Khandekar <amitdkhan.pg@gmail.com>

From: Amit Khandekar <amitdkhan.pg@gmail.com>

To: Amit Kapila <amit.kapila16@gmail.com>

Cc: Alvaro Herrera from 2ndQuadrant <alvherre@alvh.no-ip.org>, Andres Freund <andres@anarazel.de>, Juan José Santamaría Flecha <juanjo.santamaria@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Robert Haas <robertmhaas@gmail.com>, Thomas Munro <thomas.munro@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, Tomas Vondra <tomas.vondra@2ndquadrant.com>

Date: 2019-12-12T06:22:47Z

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 →

When a TAP file has non-zero exit status, retain temporary directories.
- 048c7ccd7d6d 9.6.17 landed
- d8efc5900f7c 10.12 landed
- 887657d183fc 11.7 landed
- 78a26c3edd85 12.2 landed
- bf989aaf3561 13.0 landed
Fix running out of file descriptors for spill files.
- 1ad47e8757bb 9.4.26 landed
- a6f4f407ada0 9.5.21 landed
- 27b5f48c79f7 10.12 landed
- 3e3a79735235 11.7 landed
- f8a6d8e71b17 12.2 landed
- d20703805383 13.0 landed
- ba5b4e506489 9.6.17 landed
Track statistics for spilling of changes from ReorderBuffer.
- 9290ad198b15 13.0 cited
Handle ReadFile() EOF correctly on Windows.
- 2189f49c420f 12.2 landed
- 6969deeb8d39 13.0 landed
Add logical_decoding_work_mem to limit ReorderBuffer memory usage.
- cec2edfa7859 13.0 cited
Generational memory allocator
- a4ccc1cef5a0 11.0 cited
Support retaining data dirs on successful TAP tests
- 90627cf98a8e 11.0 cited

On Thu, 12 Dec 2019 at 11:34, Amit Khandekar <amitdkhan.pg@gmail.com> wrote:

> So max_changes_in_memory is the one
> that allows us to reduce the number of transactions required, so we
> can cut down on the outer loop iterations and make the test finish
> much earlier.

>
> But also note that, we can't use the test suite in
> contrib/test_decoding, because max_changes_in_memory needs server
> restart. So we need to shift this test to src/test/recovery. And
> there, I guess it is not that critical for the testcase to be very
> quick because the tests in general are much slower than the ones in
> contrib/test_decoding, although it would be nice to make it fast. What
> I propose is to modify  max_changes_in_memory, do a server restart
> (which takes hardly a sec), run the testcase (3.5 sec) and then
> restart after resetting the guc. So totally it will be around 4-5
> seconds.

Sorry I meant max_files_per_process. We need to reduce
max_files_per_process, so that it causes max_safe_fds to be reduced,
and so only a few transactions are sufficient to reproduce the
problem, because the reserveAllocatedDesc() will return false much
sooner due to low max_safe_fds.

-- 
Thanks,
-Amit Khandekar
EnterpriseDB Corporation
The Postgres Database Company