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From "Tony Reix (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6515) testPageRounder (org.apache.hadoop.hdfs.server.datanode.TestFsDatasetCache)
Date Wed, 11 Jun 2014 13:53:01 GMT
Tony Reix created HDFS-6515:

             Summary: testPageRounder   (org.apache.hadoop.hdfs.server.datanode.TestFsDatasetCache)
                 Key: HDFS-6515
                 URL: https://issues.apache.org/jira/browse/HDFS-6515
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
    Affects Versions: 2.4.0
         Environment: Linux on PPC64
            Reporter: Tony Reix
            Priority: Blocker

I have an issue with test :
on Linux/PowerPC.

On Linux/Intel, test runs fine.

On Linux/PowerPC, I have:
testPageRounder(org.apache.hadoop.hdfs.server.datanode.TestFsDatasetCache)  Time elapsed:
64.037 sec  <<< ERROR!
java.lang.Exception: test timed out after 60000 milliseconds

Looking at details, I see that some "Failed to cache " messages appear in the traces. Only
10 on Intel, but 186 on PPC64.

On PPC64, it looks like some thread is waiting for something that never happens, generating
a TimeOut.

I'm now using IBM JVM, however I've just checked that the issue also appears with OpenJDK.

I'm now using Hadoop latest, however, the issue appeared within Hadoop 2.4.0 .

I need help for understanding what the test is doing, what traces are expected, in order to
understand what/where is the root cause.

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