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https://issues.apache.org/jira/browse/SOLR-12268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16454860#comment-16454860
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Mark Miller commented on SOLR-12268:
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The problem being, an external tool may be polling /admin/cores and you may be
opening new searchers a lot with NRT, and applyAllDeletesAndUpdates may take
non trivial time and so each call will be much longer than a request like this
should and they can start stacking up ...
> Opening a new NRT Searcher can take a while and block calls to /admin/cores.
> ----------------------------------------------------------------------------
>
> Key: SOLR-12268
> URL: https://issues.apache.org/jira/browse/SOLR-12268
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mark Miller
> Priority: Major
>
> When we open a new reader from a writer, we get an IndexWriter lock and may
> call applyAllDeletesAndUpdates. That call can take a while holding the lock.
> Meanwhile calls coming to /admin/cores get isCurrent for the reader, which
> checks if the IndexWriter is closed, which requires the IndexWriter lock.
> These leads to /admin/cores calls taking as long as applyAllDeletesAndUpdates.
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