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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-10219) BytesBytesMultiHashMap::clear() can't be concurrently used with reads
Date Sun, 05 Apr 2015 07:08:33 GMT
Gopal V created HIVE-10219:
------------------------------

             Summary: 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


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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