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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3604) Reduce stuck at shuffling phase
Date Wed, 02 Jul 2008 00:46:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12609757#action_12609757
] 

Hadoop QA commented on HADOOP-3604:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12384999/HADOOP-3604_4_20080630.patch
  against trunk revision 673215.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    -1 contrib tests.  The patch failed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2778/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2778/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2778/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2778/console

This message is automatically generated.

> Reduce stuck at shuffling phase
> -------------------------------
>
>                 Key: HADOOP-3604
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3604
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.18.0
>            Reporter: Runping Qi
>            Assignee: Arun C Murthy
>            Priority: Blocker
>             Fix For: 0.18.0
>
>         Attachments: HADOOP-3604_0_20080623.patch, HADOOP-3604_1_20080624.patch, HADOOP-3604_1_20080624.patch,
HADOOP-3604_2_20080625.patch, HADOOP-3604_3_20080627.patch, HADOOP-3604_3_20080627.patch,
HADOOP-3604_4_20080630.patch, stack.txt
>
>
> I was running gridmix with Hadoop 0.18.
> I set the map output compression to true.
> Most of the jobs completed just fine.
> Three jobs, however, got stuck.
> Each has one reducer stuck at shuffling phase.
> Here is the log:
> 2008-06-20 00:06:01,264 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM
Metrics with processName=SHUFFLE, sessionId=
> 2008-06-20 00:06:01,415 INFO org.apache.hadoop.streaming.PipeMapRed: PipeMapRed exec
[/bin/cat]
> 2008-06-20 00:06:01,463 INFO org.apache.hadoop.mapred.ReduceTask: ShuffleRamManager:
MemoryLimit=134217728, MaxSingleShuffleLimit=33554432
> 2008-06-20 00:06:01,474 INFO org.apache.hadoop.util.NativeCodeLoader: Loaded the native-hadoop
library
> 2008-06-20 00:06:01,475 INFO org.apache.hadoop.io.compress.zlib.ZlibFactory: Successfully
loaded & initialized native-zlib library
> 2008-06-20 00:06:01,476 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,477 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,477 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,478 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,478 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,486 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,486 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,487 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,487 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,488 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,488 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,489 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,489 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,489 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,493 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,496 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,496 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,496 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,497 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,497 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
> 2008-06-20 00:06:01,500 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0
Thread started: Thread for merging on-disk files
> 2008-06-20 00:06:01,500 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0
Thread waiting: Thread for merging on-disk files
> 2008-06-20 00:06:01,502 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0
Need another 270 map output(s) where 0 is already in progress
> 2008-06-20 00:06:01,503 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0
Thread started: Thread for merging in memory files
> 2008-06-20 00:06:01,503 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0:
Got 0 new map-outputs & number of known map outputs is 0
> 2008-06-20 00:06:01,504 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0
Scheduled 0 of 0 known outputs (0 slow hosts and 0 dup hosts)
> 2008-06-20 00:06:06,654 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0:
Got 269 new map-outputs & number of known map outputs is 269
> 2008-06-20 00:06:06,656 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0
Scheduled 229 of 269 known outputs (0 slow hosts and 40 dup hosts)
> 2008-06-20 00:06:07,163 INFO org.apache.hadoop.mapred.ReduceTask: Shuffling 846183 bytes
(210104 raw bytes) into RAM-FS from attempt_200806192318_0450_m_000089_0
> 2008-06-20 00:06:07,163 INFO org.apache.hadoop.mapred.ReduceTask: Shuffling 820890 bytes
(204371 raw bytes) into RAM-FS from attempt_200806192318_0450_m_000083_0
> 2008-06-20 00:06:07,166 INFO org.apache.hadoop.mapred.ReduceTask: Shuffling 835672 bytes
(208085 raw bytes) into RAM-FS from attempt_200806192318_0450_m_000122_0

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