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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-7372) Select query gives unpredictable incorrect result when parallelism is greater than 1 [Spark Branch]
Date Wed, 09 Jul 2014 15:12:04 GMT
Xuefu Zhang created HIVE-7372:
---------------------------------

             Summary: Select query gives unpredictable incorrect result when parallelism is
greater than 1 [Spark Branch]
                 Key: HIVE-7372
                 URL: https://issues.apache.org/jira/browse/HIVE-7372
             Project: Hive
          Issue Type: Bug
          Components: Spark
            Reporter: Xuefu Zhang


In SparkClient.java, if the following property is set, unpredictable, incorrect result may
be observed.
{code}
    sparkConf.set("spark.default.parallelism", "1");
{code}

It's suspected that there are some concurrency issues, as Spark may process multiple datasets
in a single JVM when parallelism is greater than 1 in order to use multiple cores.



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