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Date: Thu, 16 Aug 2012 13:08:38 +1100 (NCT)
From: "Andrew Wang (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <752415184.17342.1345082918215.JavaMail.jiratomcat@arcas>
Subject: [jira] [Resolved] (HDFS-3783) NPE in DFSInputStream
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     [ https://issues.apache.org/jira/browse/HDFS-3783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Wang resolved HDFS-3783.
-------------------------------

    Resolution: Duplicate

Dup of HDFS-3774
                
> NPE in DFSInputStream
> ---------------------
>
>                 Key: HDFS-3783
>                 URL: https://issues.apache.org/jira/browse/HDFS-3783
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha
>         Environment: CDH4.0.1 using yarn log aggregation
>            Reporter: Till Machens
>
> Calling "yarn logs" on a running application results in a NPE:
> $ yarn logs -applicationId app_1344439655593_0002
> Exception in thread "main" java.lang.NullPointerException
> 	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:606)
> 	at java.io.DataInputStream.readFully(DataInputStream.java:178)
> 	at java.io.DataInputStream.readLong(DataInputStream.java:399)
> 	at org.apache.hadoop.io.file.tfile.BCFile$Reader.<init>(BCFile.java:623)
> 	at org.apache.hadoop.io.file.tfile.TFile$Reader.<init>(TFile.java:803)
> 	at org.apache.hadoop.yarn.logaggregation.AggregatedLogFormat$LogReader.<init>(AggregatedLogFormat.java:266)
> 	at org.apache.hadoop.yarn.logaggregation.LogDumper.dumpAllContainersLogs(LogDumper.java:209)
> 	at org.apache.hadoop.yarn.logaggregation.LogDumper.run(LogDumper.java:109)
> 	at org.apache.hadoop.yarn.logaggregation.LogDumper.main(LogDumper.java:242)
> Line numbers in the stack trace differ slightly from 2.0.0-alpha, due to the Cloudera patches, but the bug seems to have its origin here (patch for HDFS-1371: https://svn.apache.org/repos/asf/hadoop/hdfs/trunk@1125145).
> At first sight this seems to be a two layer problem:
> - yarn logs -- designed for finished apps only :( -- is looking for non-existing files here (?)
> - the used HDFS-implementation, which should report block replica corruptions here, but results in NPE instead

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