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https://issues.apache.org/jira/browse/LUCENE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16076820#comment-16076820
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Steve Rowe commented on LUCENE-7868:
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For some reason these commit logs didn't get posted here:
{noformat}
Repository: lucene-solr
Updated Branches:
refs/heads/master f0cc3769b -> 7c704d525
LUCENE-7868: fix race condition when reader pooling is disabled
Project: http://git-wip-us.apache.org/repos/asf/lucene-solr/repo
Commit: http://git-wip-us.apache.org/repos/asf/lucene-solr/commit/7c704d52
Tree: http://git-wip-us.apache.org/repos/asf/lucene-solr/tree/7c704d52
Diff: http://git-wip-us.apache.org/repos/asf/lucene-solr/diff/7c704d52
Branch: refs/heads/master
Commit: 7c704d5258b3be8c383ccb96bf4a30be441f091c
Parents: f0cc376
Author: Mike McCandless <[email protected]>
Authored: Wed Jul 5 16:53:05 2017 -0400
Committer: Mike McCandless <[email protected]>
Committed: Wed Jul 5 16:53:05 2017 -0400
{noformat}
{noformat}
Repository: lucene-solr
Updated Branches:
refs/heads/branch_7x 454950aae -> 40dd3efb8
LUCENE-7868: fix race condition when reader pooling is disabled
Project: http://git-wip-us.apache.org/repos/asf/lucene-solr/repo
Commit: http://git-wip-us.apache.org/repos/asf/lucene-solr/commit/40dd3efb
Tree: http://git-wip-us.apache.org/repos/asf/lucene-solr/tree/40dd3efb
Diff: http://git-wip-us.apache.org/repos/asf/lucene-solr/diff/40dd3efb
Branch: refs/heads/branch_7x
Commit: 40dd3efb8fb6b33a3e010e8c3d391d1165bd51e6
Parents: 454950a
Author: Mike McCandless <[email protected]>
Authored: Wed Jul 5 16:53:05 2017 -0400
Committer: Mike McCandless <[email protected]>
Committed: Wed Jul 5 16:53:33 2017 -0400
{noformat}
{noformat}
Repository: lucene-solr
Updated Branches:
refs/heads/branch_7_0 ec306dce2 -> 9ec400c4f
LUCENE-7868: fix race condition when reader pooling is disabled
Project: http://git-wip-us.apache.org/repos/asf/lucene-solr/repo
Commit: http://git-wip-us.apache.org/repos/asf/lucene-solr/commit/9ec400c4
Tree: http://git-wip-us.apache.org/repos/asf/lucene-solr/tree/9ec400c4
Diff: http://git-wip-us.apache.org/repos/asf/lucene-solr/diff/9ec400c4
Branch: refs/heads/branch_7_0
Commit: 9ec400c4f69432773edd3678e21c4c08590cddf6
Parents: ec306dc
Author: Mike McCandless <[email protected]>
Authored: Wed Jul 5 16:53:05 2017 -0400
Committer: Mike McCandless <[email protected]>
Committed: Wed Jul 5 16:54:12 2017 -0400
{noformat}
> Use multiple threads to apply deletes and DV updates
> ----------------------------------------------------
>
> Key: LUCENE-7868
> URL: https://issues.apache.org/jira/browse/LUCENE-7868
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 7.0
>
> Attachments: cpu-after.png, cpu-before.png, LUCENE-7868.patch,
> LUCENE-7868.patch, LUCENE-7868.patch, LUCENE-7868.patch, LUCENE-7868.patch,
> LUCENE-7868.patch
>
>
> Today, when users delete documents or apply doc values updates, IndexWriter
> buffers them up into frozen packets and then eventually uses a single thread
> (BufferedUpdatesStream.applyDeletesAndUpdates) to resolve delete/update terms
> to docids. This thread also holds IW's monitor lock, so it also blocks
> refresh, merges starting/finishing, commits, etc.
> We have heavily optimized this part of Lucene over time, e.g. LUCENE-6161,
> LUCENE-2897, LUCENE-2680, LUCENE-3342, but still, it's a single thread so it
> can't use multiple CPU cores commonly available now.
> This doesn't affect append-only usage, but for update-heavy users (me!) this
> can be a big bottleneck, and causes long stop-the-world hangs during indexing.
> I have an initial exploratory patch to make these lookups concurrent, without
> holding IW's lock, so that when a new packet of deletes is pushed, which
> happens when we flush a new segment, we immediately use that same indexing
> thread to and resolve the deletions.
> This is analogous to when we made segment flushing concurrent (LUCENE-3023),
> just for deletes and DV updates as well.
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