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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6047) TestPread NPE inside in DFSInputStream hedgedFetchBlockByteRange
Date Tue, 04 Mar 2014 01:03:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13918855#comment-13918855
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Andrew Wang commented on HDFS-6047:
-----------------------------------

+1 pending Jenkins, thanks for tracing this down stack!

> 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
>
>         Attachments: HDFS-6047.txt
>
>
> 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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