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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2980) Fetch failures and other related issues in Jetty 6.1.26
Date Fri, 09 Sep 2011 23:43:08 GMT
Fetch failures and other related issues in Jetty 6.1.26
-------------------------------------------------------

                 Key: MAPREDUCE-2980
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2980
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: tasktracker
    Affects Versions: 0.20.205.0, 0.23.0
            Reporter: Todd Lipcon
            Priority: Critical


Since upgrading Jetty from 6.1.14 to 6.1.26 we've had a ton of HTTP-related issues, including:
- Much higher incidence of fetch failures
- A few strange file-descriptor related bugs (eg MAPREDUCE-2389)
- A few unexplained issues where long "fsck"s on the NameNode drop out halfway through with
a ClosedChannelException

Stress tests with 10000Map x 10000Reduce sleep jobs reliably reproduce fetch failures at a
rate of about 1 per million on a 25 node test cluster. These problems are all new since the
upgrade from 6.1.14.

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