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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-6820) The sync on the VersionInfo bucket in DistributedUpdateProcesser#addDocument appears to be a large bottleneck when using replication.
Date Thu, 11 Dec 2014 02:26:13 GMT

    [ https://issues.apache.org/jira/browse/SOLR-6820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14242024#comment-14242024
] 

Yonik Seeley commented on SOLR-6820:
------------------------------------

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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