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Posted to dev@hive.apache.org by "Kazuki Ohta (JIRA)" <ji...@apache.org> on 2012/08/28 18:12:08 UTC
[jira] [Commented] (HIVE-3408) A race condition is caused within
QueryPlan class
[ https://issues.apache.org/jira/browse/HIVE-3408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13443239#comment-13443239 ]
Kazuki Ohta commented on HIVE-3408:
-----------------------------------
Found that other HashSet within a same class could cause the race condition.
> 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 problem is reported by several persons on mailing list.
> http://mail-archives.apache.org/mod_mbox/hive-dev/201201.mbox/%3CCAKTRiE+3x31FDy+3F0c+jZSXQrhxBgT4DOyfZddm7sdX+cu=Zg@mail.gmail.com%3E
> http://mail-archives.apache.org/mod_mbox/hive-user/201202.mbox/%3CFC28CCD9-9C75-4F8D-B272-3D50F663A634@gmail.com%3E
> The following is a part of my 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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