Re: [HACKERS] Microvacuum support for Hash Index

Hi Ashutosh,

On 01/20/2017 04:18 AM, Ashutosh Sharma wrote:
> okay, Thanks for confirming that.
>
> I would like to update you that I am not able to reproduce this issue
> at my end. I suspect that the steps i am following might be slightly
> different than your's. Could you please have a look at steps mentioned
> below and confirm if there is something different that I am doing.
>
> Firstly, I am running the test-case on following git commit in head:
>
> <git-commmit>
> commit ba61a04bc7fefeee03416d9911eb825c4897c223
> Author: Tom Lane <tgl@sss.pgh.pa.us>
> Date:   Thu Jan 19 19:52:13 2017 -0500
>
>     Avoid core dump for empty prepared statement in an aborted transaction.
>
>     Brown-paper-bag bug in commit ab1f0c822: the old code here coped with
>     null CachedPlanSource.raw_parse_tree, the new code not so much.
>     Per report from Dave Cramer.
> </git-commit>
>
> On top of above commit, I have applied WAL v8 patch for hash index and
> MV v5 patch.
>
> Now, with an --enable-cassert build I am following below steps:
>
> 1) Created a 'test' database
>
> 2) psql -d test -f ~/ddl.sql
>
> where ddl.sql is,
>
> -- ddl.sql --
> CREATE TABLE test AS SELECT generate_series(1, 10) AS id, 0 AS val;
> CREATE INDEX IF NOT EXISTS idx_id ON test USING hash (id);
> CREATE INDEX IF NOT EXISTS idx_val ON test USING hash (val);
> ANALYZE;
> -- ddl.sql --
>
> 3) pgbench -M prepared -c 10 -j 10 -T 1800 -f ~/test.sql test
>
> where test.sql is,
>
> -- test.sql --
> \set id random(1,10)
> \set val random(0,10)
> BEGIN;
> UPDATE test SET val = :val WHERE id = :id;
> COMMIT;
> -- test.sql --
>
>
> Machine details are as follows:
>
> Architecture:          x86_64
> CPU op-mode(s):        32-bit, 64-bit
> Byte Order:            Little Endian
> CPU(s):                128
> On-line CPU(s) list:   0-127
> Thread(s) per core:    2
> Core(s) per socket:    8
> Socket(s):             8
>
> Also, It would be great if you could confirm as if you have been
> getting this issue repeatedly. Thanks.
>

Yeah, those are the steps; just with a Skylake laptop.

However, I restarted with a fresh master, with WAL v8 and MV v5, and 
can't reproduce the issue.

Best regards, Jesper