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https://issues.apache.org/jira/browse/HADOOP-3581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12627920#action_12627920
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Vinod Kumar Vavilapalli commented on HADOOP-3581:
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The first findBugs warning is already explained, cannot be avoided.
bq. The warning "Hard coded reference to an absolute pathname in
org.apache.hadoop.util.ProcfsBasedProcessTree.getProcessList()" refers to the
absolute path "/proc", which is inevitable.
The second one relates to making the member class ProcessTreeInfo static
private . The current class hierarchy is
TaskTracker(non-static)->TaskMemoryManagerThread(non-static)->ProcessTreeInfo.
ProcessTreeInfo is only related to TaskMemoryManagerThread, so we wish to leave
it like that. And because of this three-level hierarchy, it cannot be made
static.
The findBugs warnings are unavoidable. Patch is committable.
> Prevent memory intensive user tasks from taking down nodes
> ----------------------------------------------------------
>
> Key: HADOOP-3581
> URL: https://issues.apache.org/jira/browse/HADOOP-3581
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: Hemanth Yamijala
> Assignee: Vinod Kumar Vavilapalli
> Attachments: HADOOP-3581-final.txt, HADOOP-3581.20080901.2.txt,
> HADOOP-3581.20080902.txt, HADOOP-3581.6.0.txt, patch_3581_0.1.txt,
> patch_3581_3.3.txt, patch_3581_4.3.txt, patch_3581_4.4.txt,
> patch_3581_5.0.txt, patch_3581_5.2.txt
>
>
> Sometimes user Map/Reduce applications can get extremely memory intensive,
> maybe due to some inadvertent bugs in the user code, or the amount of data
> processed. When this happens, the user tasks start to interfere with the
> proper execution of other processes on the node, including other Hadoop
> daemons like the DataNode and TaskTracker. Thus, the node would become
> unusable for any Hadoop tasks. There should be a way to prevent such tasks
> from bringing down the node.
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