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https://issues.apache.org/jira/browse/SOLR-5081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13723856#comment-13723856
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Erick Erickson commented on SOLR-5081:
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Agreed, although we should be able to see the deadlock on the semaphore that we
saw before in SolrCmdDistributor in here somewhere, and it's not in the stack
trace we've seen so far.
> Highly parallel document insertion hangs SolrCloud
> --------------------------------------------------
>
> Key: SOLR-5081
> URL: https://issues.apache.org/jira/browse/SOLR-5081
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.3.1
> Reporter: Mike Schrag
> Attachments: threads.txt
>
>
> If I do a highly parallel document load using a Hadoop cluster into an 18
> node solrcloud cluster, I can deadlock solr every time.
> The ulimits on the nodes are:
> core file size (blocks, -c) 0
> data seg size (kbytes, -d) unlimited
> scheduling priority (-e) 0
> file size (blocks, -f) unlimited
> pending signals (-i) 1031181
> max locked memory (kbytes, -l) unlimited
> max memory size (kbytes, -m) unlimited
> open files (-n) 32768
> pipe size (512 bytes, -p) 8
> POSIX message queues (bytes, -q) 819200
> real-time priority (-r) 0
> stack size (kbytes, -s) 10240
> cpu time (seconds, -t) unlimited
> max user processes (-u) 515590
> virtual memory (kbytes, -v) unlimited
> file locks (-x) unlimited
> The open file count is only around 4000 when this happens.
> If I bounce all the servers, things start working again, which makes me think
> this is Solr and not ZK.
> I'll attach the stack trace from one of the servers.
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