Re: logical decoding : exceeded maxAllocatedDescs for .spill files

Amit Kapila <amit.kapila16@gmail.com>

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

To: Juan José Santamaría Flecha <juanjo.santamaria@gmail.com>

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

Date: 2019-11-21T04:02:07Z

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 Wed, Nov 20, 2019 at 5:41 PM Juan José Santamaría Flecha
<juanjo.santamaria@gmail.com> wrote:
>
> On Wed, Nov 20, 2019 at 9:48 AM Amit Khandekar <amitdkhan.pg@gmail.com> wrote:
>>
>> On Wed, 20 Nov 2019 at 13:10, Amit Kapila <amit.kapila16@gmail.com> wrote:
>> > See comment in pgunlink() "We need to loop because even though
>> > PostgreSQL uses flags that allow unlink while the file is open, other
>> > applications might have the file
>> > open without those flags.".  Can you once see if there is any flag
>> > that you have missed to pass to allow this?
>>
>> > If there is nothing we
>> > can do about it, then we might need to use some different API or maybe
>> > define a new API that can handle this.
>>
>> There were objections against modifying the vfd api only for this
>> replication-related use-case. Having a new API will require all the
>> changes required to enable the virtual FDs feature that we need from
>> vfd. If nothing works out from the FILE_SHARE_DELETE thing, I am
>> thinking, we can use VFD, plus we can keep track of per-subtransaction
>> vfd handles, and do something similar to AtEOSubXact_Files().
>>
>
> The comment about "other applications might have the file open without those flags." is surely due to systems working with an antivirus touching Postgres files.
>
> I was not able to reproduce the Permission denied error with current HEAD,
>

I am not sure what exactly you tried.  Can you share the steps and
your environment details?

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