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https://issues.apache.org/jira/browse/MAPREDUCE-5042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600630#comment-13600630
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Hadoop QA commented on MAPREDUCE-5042:
--------------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12573432/MAPREDUCE-5042.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 4 new
or modified test files.
{color:green}+1 tests included appear to have a timeout.{color}
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any
warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3410//testReport/
Console output:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3410//console
This message is automatically generated.
> 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
> 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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