[HADOOP-549] NullPointerException in TaskReport's serialization code

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.11.0
• Assignee: Owen O'Malley
• Reporter: Michel Tourn
• Created: 19/Sep/06 18:51
• Updated: 08/Jul/09 16:51
• Resolved: 31/Jan/07 22:43

Description

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