[MAPREDUCE-5042] Reducer unable to fetch for a map task that was recovered

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.23.7, 2.0.4-alpha
• Fix Version/s: 0.23.7, 2.1.0-beta
• Component/s: mr-am, security
• Target Version/s: 0.23.7, 2.1.0-beta
• Assignee: Jason Lowe
• Reporter: Jason Lowe
• Created: 01/Mar/13 23:09
• Updated: 03/Sep/14 22:57
• Resolved: 15/Mar/13 21:20

Description

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:

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)

Looking at the corresponding NM's logs, we see the shuffle failed due to "Verification of the hashReply failed".

Issue Links

• duplicates: YARN-403 Node Manager throws java.io.IOException: Verification of the hashReply failed