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https://issues.apache.org/jira/browse/LUCENE-6094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14236508#comment-14236508
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Robert Muir commented on LUCENE-6094:
-------------------------------------
+1
> IW.rollback can take forever when CMS has stalled threads
> ---------------------------------------------------------
>
> Key: LUCENE-6094
> URL: https://issues.apache.org/jira/browse/LUCENE-6094
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 5.0, Trunk
>
> Attachments: LUCENE-6094.patch
>
>
> CMS hard-stalls incoming threads for denial-of-service protection when
> merging cannot keep up with whatever is producing new segments.
> When you call IW.rollback, it asks all merges to abort, and a running merge
> will periodically check to see if it should abort.
> However, a stalled merge fails to check, which means rollback can take
> indefinitely long; I've seen this in Elasticsearch causing shutdown to take >
> 10 sec.
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