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https://issues.apache.org/jira/browse/HIVE-10219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Shelukhin resolved HIVE-10219.
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Resolution: Fixed
Fix Version/s: llap
Fixed in branch by making clear a no-op for now (discardData method used for
Hybrid case)
> BytesBytesMultiHashMap::clear() can't be concurrently used with reads
> ---------------------------------------------------------------------
>
> Key: HIVE-10219
> URL: https://issues.apache.org/jira/browse/HIVE-10219
> Project: Hive
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Gopal V
> Assignee: Sergey Shelukhin
> Fix For: llap
>
>
> The semantics of the HashMap::clear() is unclear for concurrent access.
> With HIVE-10128 fixes, the only remaining thread-safety concern is the
> behaviour of clear() calls.
> Concurrent usage + clearing from HybridHash and VectorMapJoin operator will
> result in race conditions.
> There is no valid clear() operations possible without knowledge of the cached
> nature and the ref-count of each hashtable.
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