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https://issues.apache.org/jira/browse/MAPREDUCE-3768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198007#comment-13198007
]
Eli Collins commented on MAPREDUCE-3768:
----------------------------------------
Here's a jstack during test execution. Possible that it could be a bug in Hive
but more likely an issue of 2450 interacting with the LocalJobRunner.
{noformat}
"LocalJobRunner Map Task Executor #0" prio=5 tid=102804800 nid=0x10ef1e000 in
Object.wait() [10ef1d000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <7bd6c6890> (a java.lang.Object)
at java.lang.Object.wait(Object.java:485)
at
org.apache.hadoop.mapred.Task$TaskReporter.stopCommunicationThread(Task.java:726)
- locked <7bd6c6890> (a java.lang.Object)
at org.apache.hadoop.mapred.Task.done(Task.java:935)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:332)
at
org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:232)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
{noformat}
> MR-2450 introduced a significant performance regression
> -------------------------------------------------------
>
> Key: MAPREDUCE-3768
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3768
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.1
> Reporter: Eli Collins
> Priority: Blocker
>
> MAPREDUCE-2450 introduced, or at least triggers, a significant performance
> regression in Hive. With MR-2450 the execution time of TestCliDriver.skewjoin
> goes from 2 minutes to 15 minutes. Reverting this change from the build fixes
> the issue.
> Here's the relevant query:
> {noformat}
> FROM src src1 JOIN src src2 ON (src1.key = src2.key)
> INSERT OVERWRITE TABLE dest_j1 SELECT src1.key, src2.value;
> {noformat}
> You can reproduce this by running the following from Hive 8.0 against Hadoop
> built from branch-23.
> {noformat}
> ant very-clean package test -Dtestcase=TestCliDriver -Dqfile=skewjoin.q
> {noformat}
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