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https://issues.apache.org/jira/browse/SOLR-6838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14243117#comment-14243117
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Mark Miller commented on SOLR-6838:
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In a quick run, I see 3 large merges done by a concurrent indexing merge
thread. Each time, this thread spends 10-20 seconds in IW#_mergeInit dealing
with updates in BufferedUpdateStream#applyDeletesAndUpdates. This holds the IW
lock and all indexing threads are blocked in updatePendingMerges or
publishFlushedSegments.
> Bulk loading with the default of updateDocument blocks all indexing for long
> periods of time.
> ---------------------------------------------------------------------------------------------
>
> Key: SOLR-6838
> URL: https://issues.apache.org/jira/browse/SOLR-6838
> Project: Solr
> Issue Type: Sub-task
> Reporter: Mark Miller
>
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