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From "Plamen Jeliazkov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4475) OutOfMemory by BPServiceActor.offerService() takes down DataNode
Date Thu, 07 Feb 2013 22:07:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573985#comment-13573985

Plamen Jeliazkov commented on HDFS-4475:

Indeed the issue why I bothered raising the JIRA was because the crash was vague and the OOM
does not stand out compared to lines of "Block Pool shutting down", etc, that got printed
in the logs.

Look at my log snippet I posted. That line was nowhere near the bottom of the logs by the
time DataNode shutdown. It would be nice if it could be made more apparent as it was the root
> OutOfMemory by BPServiceActor.offerService() takes down DataNode
> ----------------------------------------------------------------
>                 Key: HDFS-4475
>                 URL: https://issues.apache.org/jira/browse/HDFS-4475
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 2.0.3-alpha
>            Reporter: Plamen Jeliazkov
>            Assignee: Plamen Jeliazkov
>             Fix For: 3.0.0, 2.0.3-alpha
> In DataNode, there are catchs around BPServiceActor.offerService() call but no catch
for OutOfMemory as there is for the DataXeiver as introduced in 0.22.0.
> The issue can be replicated like this:
> 1) Create a cluster of X DataNodes and 1 NameNode and low memory settings (-Xmx128M or
something similar).
> 2) Flood HDFS with small file creations (any should work actually).
> 3) DataNodes will hit OoM, stop blockpool service, and shutdown.
> The resolution is to catch the OoMException and handle it properly when calling BPServiceActor.offerService()
in DataNode.java; like as done in 0.22.0 of Hadoop. DataNodes should not shutdown or crash
but remain in a sort of frozen state until memory issues are resolved by GC.
> 2013-02-04 11:46:01,854 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Unexpected
exception in block pool Block pool BP-1105714849- (storage id DS-1952316202-
service to vmhost2-vm0/
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> 2013-02-04 11:46:01,854 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Ending
block pool service for: Block pool BP-1105714849- (storage id DS-1952316202-
service to vmhost2-vm0/

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