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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6047) TestPread NPE inside in DFSInputStream hedgedFetchBlockByteRange
Date Tue, 04 Mar 2014 04:12:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13918992#comment-13918992

Hadoop QA commented on HDFS-6047:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:red}-1 findbugs{color}.  The patch appears to introduce 3 new Findbugs (version
1.3.9) warnings.

        {color:red}-1 release audit{color}.  The applied patch generated 1 release audit warnings.

    {color:red}-1 core tests{color}.  The test build failed in hadoop-hdfs-project/hadoop-hdfs

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/6287//testReport/
Release audit warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/6287//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt
Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/6287//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6287//console

This message is automatically generated.

> 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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