Joel Bernstein created SOLR-7352:
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Summary: Synchronize CloudSolrStream's EOF Tuple Map
Key: SOLR-7352
URL: https://issues.apache.org/jira/browse/SOLR-7352
Project: Solr
Issue Type: Bug
Reporter: Joel Bernstein
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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