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https://issues.apache.org/jira/browse/SOLR-1711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12849865#action_12849865
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Luke Forehand commented on SOLR-1711:
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This is a very serious problem for us. We have multiple threads adding to the
StreamingUpdateSolrServer's BlockingQueue, and if I bump the thread count high
enough (around 10 for my process) I can reproduce this problem every time. I'd
say this bug is critical enough to warrant a SOLR bug-fix release.
> Race condition in
> org/apache/solr/client/solrj/impl/StreamingUpdateSolrServer.java
> ----------------------------------------------------------------------------------
>
> Key: SOLR-1711
> URL: https://issues.apache.org/jira/browse/SOLR-1711
> Project: Solr
> Issue Type: Bug
> Components: clients - java
> Affects Versions: 1.4, 1.5
> Reporter: Attila Babo
> Priority: Critical
> Fix For: 1.5
>
> Attachments: StreamingUpdateSolrServer.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> While inserting a large pile of documents using StreamingUpdateSolrServer
> there is a race condition as all Runner instances stop processing while the
> blocking queue is full. With a high performance client this could happen
> quite often, there is no way to recover from it at the client side.
> In StreamingUpdateSolrServer there is a BlockingQueue called queue to store
> UpdateRequests, there are up to threadCount number of workers threads from
> StreamingUpdateSolrServer.Runner to read that queue and push requests to a
> Solr instance. If at one point the BlockingQueue is empty all workers stop
> processing it and pushing the collected content to Solr which could be a time
> consuming process, sometimes all worker threads are waiting for Solr. If at
> this time the client fills the BlockingQueue to full all worker threads will
> quit without processing any further and the main thread will block forever.
> There is a simple, well tested patch attached to handle this situation.
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