Horton

Re: Hash Indexes

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Jesper Pedersen <jesper.pedersen@redhat.com>, Jeff Janes <jeff.janes@gmail.com>, Mithun Cy <mithun.cy@enterprisedb.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2016-10-28T04:33:16Z
Lists: pgsql-hackers

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On Fri, Oct 28, 2016 at 2:52 AM, Robert Haas <robertmhaas@gmail.com> wrote:
> On Mon, Oct 24, 2016 at 10:30 AM, Amit Kapila <amit.kapila16@gmail.com> wrote:
>>> Amit, can you please split the buffer manager changes in this patch
>>> into a separate patch?
>>
>> Sure, attached patch extend_bufmgr_api_for_hash_index_v1.patch does that.
>
> The additional argument to ConditionalLockBuffer() doesn't seem to be
> used anywhere in the main patch.  Do we actually need it?
>

No, with latest patch of concurrent hash index, we don't need it.  I
have forgot to remove it.  Please find updated patch attached.  The
usage of second parameter for ConditionalLockBuffer() is removed as we
don't want to allow I/O across content locks, so the patch is changed
to fallback to twice locking the metapage.


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

Commits

  1. Remove _hash_wrtbuf() in favor of calling MarkBufferDirty().

  2. Fix race introduced by 6d46f4783efe457f74816a75173eb23ed8930020.

  3. Improve hash index bucket split behavior.

  4. Reduce pinning and buffer content locking for btree scans.