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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6047) TestPread NPE inside in DFSInputStream hedgedFetchBlockByteRange
Date Tue, 04 Mar 2014 00:57:21 GMT
stack created HDFS-6047:
---------------------------

             Summary: TestPread NPE inside in DFSInputStream hedgedFetchBlockByteRange
                 Key: HDFS-6047
                 URL: https://issues.apache.org/jira/browse/HDFS-6047
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.4.0
            Reporter: stack
            Assignee: stack
             Fix For: 2.4.0


Our [~andrew.wang] saw this on internal test cluster running trunk:

{code}
java.lang.NullPointerException: null
	at org.apache.hadoop.hdfs.DFSInputStream.hedgedFetchBlockByteRange(DFSInputStream.java:1181)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:1296)
	at org.apache.hadoop.fs.FSInputStream.readFully(FSInputStream.java:78)
	at org.apache.hadoop.fs.FSDataInputStream.readFully(FSDataInputStream.java:108)
	at org.apache.hadoop.hdfs.TestPread.pReadFile(TestPread.java:151)
	at org.apache.hadoop.hdfs.TestPread.testMaxOutHedgedReadPool(TestPread.java:292)
{code}

TestPread was failing.

The NPE comes of our presuming there always a chosenNode as we set up hedged reads inside
in hedgedFetchBlockByteRange (chosenNode is null'd each time through the loop).  Usually there
is a chosenNode but need to allow for case where there is not.



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