Jason Lowe created MAPREDUCE-5042:
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Summary: 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-beta
Reporter: Jason Lowe
Priority: Blocker
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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