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https://issues.apache.org/jira/browse/HADOOP-5374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677955#action_12677955
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Vinod K V commented on HADOOP-5374:
-----------------------------------
This affects heartbeats. I see a lot of the following in the JT's logs.
{code}
2009-02-28 08:12:10,332 INFO org.apache.hadoop.ipc.Server: IPC Server handler
34 on 52000, call
heartbeat(org.apache.hadoop.mapred.tasktrackersta...@4b68032e, false, false,
true, 5832) f
rom <ip:port>: error: java.io.IOException: java.lang.NullPointerException
java.io.IOException: java.lang.NullPointerException
at
org.apache.hadoop.mapred.TaskInProgress.shouldCommit(TaskInProgress.java:420)
at
org.apache.hadoop.mapred.JobTracker.getTasksToSave(JobTracker.java:2585)
at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:2334)
at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)
org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
{code}
An offline discussion with Amareshwari concluded that in getTasksToSave()
method, the task's state on the JT should also be checked along with the state
as reported by the TT.
> NPE in JobTracker.getTasksToSave() method
> -----------------------------------------
>
> Key: HADOOP-5374
> URL: https://issues.apache.org/jira/browse/HADOOP-5374
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Vinod K V
>
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