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https://issues.apache.org/jira/browse/SOLR-6820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14242024#comment-14242024
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Yonik Seeley commented on SOLR-6820:
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bq. In the instance I'm seeing, the hashing looks okay, but it seems that this
can be hit and block for up almost a minute in this test.
Hmmm, this looks like a lucene limitation, and perhaps should be considered a
bug. It looks like the IndexWriter is "stealing" the thread used to add a
document in order flush a complete segment (and hence a single add can
sometimes take an order of magnitude longer?)
> The sync on the VersionInfo bucket in DistributedUpdateProcesser#addDocument
> appears to be a large bottleneck when using replication.
> -------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-6820
> URL: https://issues.apache.org/jira/browse/SOLR-6820
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Reporter: Mark Miller
> Attachments: threads.png
>
>
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