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From "Carl Steinbach (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-3408) A race condition is caused within QueryPlan class
Date Mon, 27 Aug 2012 08:04:07 GMT

     [ https://issues.apache.org/jira/browse/HIVE-3408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Carl Steinbach updated HIVE-3408:
---------------------------------

    Labels: Concurrency  (was: )
    
> A race condition is caused within QueryPlan class
> -------------------------------------------------
>
>                 Key: HIVE-3408
>                 URL: https://issues.apache.org/jira/browse/HIVE-3408
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.7.1
>         Environment: * Java 1.6.0_21, Java HotSpot(TM) 64-Bit Server VM
> * Ubuntu 10.04
>            Reporter: Muga Nishizawa
>              Labels: Concurrency
>         Attachments: race-condition-of-done-field.patch
>
>
> Hive's threads are stopped at HashMap.getEntry(..) that is used within QueryPlan#extractCounters()
and QueryPlan#updateCountersInQueryPlan().  It seems that a race condition problem of a HashSet
object is caused when extractCounters() and updateCountersInQueryPlan() are concurrently executed.
 I hit the problem with Hive 0.7.1 but, I think that it also is caused with 0.8.1.
> The following is a part of the thread dump.
> {quote}
> "Thread-1091" prio=10 tid=0x00007fd17112b000 nid=0x1100 runnable [0x00007fd175f60000]
>    java.lang.Thread.State: RUNNABLE
>    at java.util.HashMap.getEntry(HashMap.java:347)
>    at java.util.HashMap.containsKey(HashMap.java:335)
>    at java.util.HashSet.contains(HashSet.java:184)
>    at org.apache.hadoop.hive.ql.QueryPlan.extractCounters(QueryPlan.java:342)
>    at org.apache.hadoop.hive.ql.QueryPlan.getQueryPlan(QueryPlan.java:419)
>    at org.apache.hadoop.hive.ql.QueryPlan.toString(QueryPlan.java:592)
>    at org.apache.hadoop.hive.ql.history.HiveHistory.logPlanProgress(HiveHistory.java:493)
>    at org.apache.hadoop.hive.ql.exec.ExecDriver.progress(ExecDriver.java:395)
>    at org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:686)
>    at org.apache.hadoop.hive.ql.exec.MapRedTask.execute(MapRedTask.java:123)
>    at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:130)
>    at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
>    at org.apache.hadoop.hive.ql.exec.TaskRunner.run(TaskRunner.java:47)
> "Thread-1090" prio=10 tid=0x00007fd17012f000 nid=0x10ff runnable [0x00007fd175152000]
>    java.lang.Thread.State: RUNNABLE
>    at java.util.HashMap.getEntry(HashMap.java:347)
>    at java.util.HashMap.containsKey(HashMap.java:335)
>    at java.util.HashSet.contains(HashSet.java:184)
>    at org.apache.hadoop.hive.ql.QueryPlan.updateCountersInQueryPlan(QueryPlan.java:297)
>    at org.apache.hadoop.hive.ql.QueryPlan.getQueryPlan(QueryPlan.java:420)
>    at org.apache.hadoop.hive.ql.QueryPlan.toString(QueryPlan.java:592)
>    at org.apache.hadoop.hive.ql.history.HiveHistory.logPlanProgress(HiveHistory.java:493)
>    at org.apache.hadoop.hive.ql.exec.ExecDriver.progress(ExecDriver.java:395)
>    at org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:686)
>    at org.apache.hadoop.hive.ql.exec.MapRedTask.execute(MapRedTask.java:123)
>    at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:130)
>    at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
>    at org.apache.hadoop.hive.ql.exec.TaskRunner.run(TaskRunner.java:47)
> {quote}

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