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https://issues.apache.org/jira/browse/SOLR-7280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15388456#comment-15388456
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Mark Miller commented on SOLR-7280:
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Okay, I think I got it.
At some point after the bug I'm referring to was resolved, registering in ZK
got spun off into it's own thread and no longer holds up the core load thread.
You can see this in ZkContainer. That effectively creates the situation I
suggest above:
bq. If it indeed remains an issue, another thing we might try is loading cores
with a limited number of threads, but registering with ZK with many more,
instead of doing both in the same thread as we are now.
So we are okay on this issue. [~mdrob], it would be great to get some form of
that test committed.
> Load cores in sorted order and tweak coreLoadThread counts to improve cluster
> stability on restarts
> ---------------------------------------------------------------------------------------------------
>
> Key: SOLR-7280
> URL: https://issues.apache.org/jira/browse/SOLR-7280
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Assignee: Noble Paul
> Fix For: 6.2, 5.5.3
>
> Attachments: SOLR-7280-5x.patch, SOLR-7280-5x.patch,
> SOLR-7280-5x.patch, SOLR-7280.patch, SOLR-7280.patch
>
>
> In SOLR-7191, Damien mentioned that by loading solr cores in a sorted order
> and tweaking some of the coreLoadThread counts, he was able to improve the
> stability of a cluster with thousands of collections. We should explore some
> of these changes and fold them into Solr.
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