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https://issues.apache.org/jira/browse/SOLR-7352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14481292#comment-14481292
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ASF subversion and git services commented on SOLR-7352:
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Commit 1671547 from [~joel.bernstein] in branch 'dev/trunk'
[ https://svn.apache.org/r1671547 ]
SOLR-7352: Synchronize CloudSolrStream EOF Tuple Map
> Synchronize CloudSolrStream EOF Tuple Map
> -----------------------------------------
>
> Key: SOLR-7352
> URL: https://issues.apache.org/jira/browse/SOLR-7352
> Project: Solr
> Issue Type: Bug
> Reporter: Joel Bernstein
> Attachments: SOLR-7352.patch, SOLR-7352.patch
>
>
> CloudSolrStream currently collects the EOF Tuples from the underlying
> SolrStreams in an un-synchronized Map.
> This ticket synchronizes this Map because of the following race condition:
> The underlying SolrStream's are opened in parallel. If the first Tuple
> returned by two or more SolrStream's is an EOF Tuple, then a race condition
> will occur as the EOF Tuples are added to the Map.
> The race condition only occurs if EOF tuples are returned during the
> *opening* of the SolrStreams (zero results returned). This is because the
> *reading* of SolrStreams is performed in a single thread, so if the initial
> Tuple returned is not an EOF Tuple no race condition is possible.
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