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https://issues.apache.org/jira/browse/SOLR-10524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16297192#comment-16297192
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ASF GitHub Bot commented on SOLR-10524:
---------------------------------------
GitHub user slackhappy opened a pull request:
https://github.com/apache/lucene-solr/pull/294
ZkStateReader: cache LazyCollectionRef
SOLR-10524 introduced zk state update batching, with
a default interval of 2 seconds. That opens
the door for a simple, time-based cache on the read side
to address the issue described in SOLR-8327
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/slackhappy/lucene-solr
cloud_cache_lazy_collection_ref
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/lucene-solr/pull/294.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #294
----
commit e7c6a6773f1d01d2ddb0dbce6cdbaeff52e78376
Author: John Gallagher <jgallag...@slack-corp.com>
Date: 2017-12-19T16:57:25Z
ZkStateReader: cache LazyCollectionRef
SOLR-10524 introduced zk state update batching, with
a default interval of 2 seconds. That opens
the door for a simple, time-based cache on the read side
to address the issue described in SOLR-8327
----
> Better ZkStateWriter batching
> -----------------------------
>
> Key: SOLR-10524
> URL: https://issues.apache.org/jira/browse/SOLR-10524
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Erick Erickson
> Assignee: Cao Manh Dat
> Fix For: 6.6, 7.0
>
> Attachments: SOLR-10524-NPE-fix.patch, SOLR-10524-dragonsinth.patch,
> SOLR-10524.patch, SOLR-10524.patch, SOLR-10524.patch, SOLR-10524.patch
>
>
> There are several JIRAs (I'll link in a second) about trying to be more
> efficient about processing overseer messages as the overseer can become a
> bottleneck, especially with very large numbers of replicas in a cluster. One
> of the approaches mentioned near the end of SOLR-5872 (15-Mar) was to "read
> large no:of items say 10000. put them into in memory buckets and feed them
> into overseer....".
> This JIRA is to break out that part of the discussion as it might be an easy
> win whereas "eliminating the Overseer queue" would be quite an undertaking.
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