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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5042) Reducer unable to fetch for a map task that was recovered
Date Fri, 15 Mar 2013 21:26:14 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13603872#comment-13603872
] 

Hudson commented on MAPREDUCE-5042:
-----------------------------------

Integrated in Hadoop-trunk-Commit #3483 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/3483/])
    MAPREDUCE-5042. Reducer unable to fetch for a map task that was recovered (Jason Lowe
via bobby) (Revision 1457119)

     Result = SUCCESS
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1457119
Files : 
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/YarnChild.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/MRAppMaster.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/JobImpl.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/MRApp.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/TestRecovery.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TestJobImpl.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/Task.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/JobSubmitter.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/security/TokenCache.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/Fetcher.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/Shuffle.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/pipes/TestPipeApplication.java

                
> Reducer unable to fetch for a map task that was recovered
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-5042
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5042
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am, security
>    Affects Versions: 0.23.7, 2.0.4-alpha
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Blocker
>             Fix For: 3.0.0, 0.23.7, 2.0.5-beta
>
>         Attachments: MAPREDUCE-5042.patch, MAPREDUCE-5042.patch, MAPREDUCE-5042.patch,
MAPREDUCE-5042.patch
>
>
> If an application attempt fails and is relaunched the AM will try to recover previously
completed tasks.  If a reducer needs to fetch the output of a map task attempt that was recovered
then it will fail with a 401 error like this:
> {noformat}
> java.io.IOException: Server returned HTTP response code: 401 for URL: http://xx:xx/mapOutput?job=job_1361569180491_21845&reduce=0&map=attempt_1361569180491_21845_m_000016_0
> 	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1615)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:231)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:156)
> {noformat}
> Looking at the corresponding NM's logs, we see the shuffle failed due to "Verification
of the hashReply failed".

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