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https://issues.apache.org/jira/browse/MAPREDUCE-4657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13455380#comment-13455380
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Bikas Saha commented on MAPREDUCE-4657:
---------------------------------------
The NPE is occurring because of not handling null return when systeminfo shell
call throws exception (for any reason).
Ideally the exception would be propagated but the ResourceCalculatorPlugin
interface does not support it.
> WindowsResourceCalculatorPlugin has NPE
> ---------------------------------------
>
> Key: MAPREDUCE-4657
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4657
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Bikas Saha
> Priority: Minor
>
> When Shell command execution is interrupted then
> WindowsResourceCalculatorPlugin has NPE.
> code}
> 2012-08-31 13:01:00,140 ERROR [Thread-771]
> util.WindowsResourceCalculatorPlugin(69): java.io.IOException:
> java.lang.InterruptedException^M
> at org.apache.hadoop.util.Shell.runCommand(Shell.java:424)^M
> at org.apache.hadoop.util.Shell.run(Shell.java:336)^M
> at
> org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:540)^M
> at
> org.apache.hadoop.util.WindowsResourceCalculatorPlugin.getSystemInfoInfoFromShell(WindowsResourceCalculatorPlugin.java:66)^M
> at
> org.apache.hadoop.util.WindowsResourceCalculatorPlugin.refreshIfNeeded(WindowsResourceCalculatorPlugin.java:81)^M
> at
> org.apache.hadoop.util.WindowsResourceCalculatorPlugin.getAvailableVirtualMemorySize(WindowsResourceCalculatorPlugin.java:126)^M
> at
> org.apache.hadoop.mapred.TaskTracker.getAvailableVirtualMemoryOnTT(TaskTracker.java:1933)^M
> at
> org.apache.hadoop.mapred.TaskTracker.transmitHeartBeat(TaskTracker.java:1834)^M
> at
> org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:1664)^M
> at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:2516)^M
> at
> org.apache.hadoop.mapred.MiniMRCluster$TaskTrackerRunner.run(MiniMRCluster.java:217)^M
> at java.lang.Thread.run(Thread.java:662)^M
> ^M
> 2012-08-31 13:01:00,140 ERROR [Thread-771] mapred.TaskTracker(1766): Caught
> exception: java.lang.NullPointerException^M
> at
> org.apache.hadoop.util.WindowsResourceCalculatorPlugin.refreshIfNeeded(WindowsResourceCalculatorPlugin.java:83)^M
> at
> org.apache.hadoop.util.WindowsResourceCalculatorPlugin.getAvailableVirtualMemorySize(WindowsResourceCalculatorPlugin.java:126)^M
> at
> org.apache.hadoop.mapred.TaskTracker.getAvailableVirtualMemoryOnTT(TaskTracker.java:1933)^M
> at
> org.apache.hadoop.mapred.TaskTracker.transmitHeartBeat(TaskTracker.java:1834)^M
> at
> org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:1664)^M
> at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:2516)^M
> at
> org.apache.hadoop.mapred.MiniMRCluster$TaskTrackerRunner.run(MiniMRCluster.java:217)^M
> at java.lang.Thread.run(Thread.java:662)^M
> {code}
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