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https://issues.apache.org/jira/browse/SOLR-6406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14984535#comment-14984535
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Yonik Seeley commented on SOLR-6406:
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OK, so I haven't hit any hangs with this latest patch and shutdownNow() on the
associated executor. Interestingly enough though, this still results in
inconsistent shard failures. My guess is that the shutdown of the executor is
done as one of the last steps in CoreContainer.shutdown(), which still gives
time for streaming update requests to continue streaming.
> ConcurrentUpdateSolrServer hang in blockUntilFinished.
> ------------------------------------------------------
>
> Key: SOLR-6406
> URL: https://issues.apache.org/jira/browse/SOLR-6406
> Project: Solr
> Issue Type: Bug
> Reporter: Mark Miller
> Fix For: 5.0, Trunk
>
> Attachments: CPU Sampling.png, SOLR-6406.patch, SOLR-6406.patch,
> SOLR-6406.patch
>
>
> Not sure what is causing this, but SOLR-6136 may have taken us a step back
> here. I see this problem occasionally pop up in ChaosMonkeyNothingIsSafeTest
> now - test fails because of a thread leak, thread leak is due to a
> ConcurrentUpdateSolrServer hang in blockUntilFinished. Only started popping
> up recently.
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