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https://issues.apache.org/jira/browse/HADOOP-549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12469213
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Hadoop QA commented on HADOOP-549:
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+1, because
http://issues.apache.org/jira/secure/attachment/12350074/task-report.patch
applied and successfully tested against trunk revision r501946.
> NullPointerException in TaskReport's serialization code
> -------------------------------------------------------
>
> Key: HADOOP-549
> URL: https://issues.apache.org/jira/browse/HADOOP-549
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Reporter: Michel Tourn
> Assigned To: Owen O'Malley
> Fix For: 0.11.0
>
> Attachments: readstringarray.patch, task-report.patch
>
>
> TaskReport[] rep = jc.getMapTaskReports(jobId);
> I get de/serialization problems:
> This change suggested by Owen fixes it:
> - new ObjectWritable(diagnostics).write(out);
> + WritableUtils.writeStringArray(out, diagnostics);
> - ObjectWritable wrapper = new ObjectWritable();
> - wrapper.readFields(in);
> - diagnostics = (String[])wrapper.get();
> + diagnostics = WritableUtils.readStringArray(in);
> java.lang.NullPointerException
> at org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:174)
> at org.apache.hadoop.io.ObjectWritable.readFields(ObjectWritable.java:59)
> at org.apache.hadoop.mapred.TaskReport.readFields(TaskReport.java:64)
> at org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:225)
> at org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:163)
> at org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:210)
> at org.apache.hadoop.io.ObjectWritable.readFields(ObjectWritable.java:59)
> at org.apache.hadoop.ipc.Client$Connection.run(Client.java:256)
> 2006-09-19 08:44:31,059 WARN ipc.Server (Server.java:run(493)) - handler
> output error
> java.nio.channels.ClosedChannelException
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