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From "Konstantin Boudnik (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2452) OutOfMemoryError in DataXceiverServer takes down the DataNode
Date Thu, 20 Oct 2011 20:11:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131976#comment-13131976
] 

Konstantin Boudnik commented on HDFS-2452:
------------------------------------------

Thanks for fixing aspect code Uma - I was doing it in a hassle last night and did a suboptimal
job apparently.
Aspects should be injected in 'injectfaults' target which is called by the test target. You
don't need to have anything else to make it happen: all components of AOP framework are in
place by default. 

I have applied your patch and ran the test and I see that injected code is working as expected.
I see many OOM errors thrown from a huge number of the DataXceiver threads like this
{noformat}
    [junit] Exception in thread "org.apache.hadoop.hdfs.server.datanode.DataXceiver@7e3feb83"
java.lang.OutOfMemoryError: Pretend there's no more memory
    [junit]     at org.apache.hadoop.hdfs.server.datanode.DataXceiverAspects.ajc$before$org_apache_hadoop_hdfs_server_datanode_DataXceiverAspects$1$1a38ea(DataXceiverAspects.aj:36)
   [junit]     at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:120)
   [junit]     at java.lang.Thread.run(Thread.java:680)    
    [junit] Exception in thread "org.apache.hadoop.hdfs.server.datanode.DataXceiver@29b18dc0"
java.lang.OutOfMemoryError: Pretend there's no more memory
    [junit]     at org.apache.hadoop.hdfs.server.datanode.DataXceiverAspects.ajc$before$org_apache_hadoop_hdfs_server_datanode_DataXceiverAspects$1$1a38ea(DataXceiverAspects.aj:36)
   [junit]     at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:120)
   [junit]     at java.lang.Thread.run(Thread.java:680)
{noformat}
                
> OutOfMemoryError in DataXceiverServer takes down the DataNode
> -------------------------------------------------------------
>
>                 Key: HDFS-2452
>                 URL: https://issues.apache.org/jira/browse/HDFS-2452
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.22.0
>            Reporter: Konstantin Shvachko
>            Assignee: Uma Maheswara Rao G
>             Fix For: 0.22.0
>
>         Attachments: HDFS-2452-22Branch.2.patch, HDFS-2452-22branch.1.patch, HDFS-2452-22branch.patch,
HDFS-2452-22branch.patch, HDFS-2452-22branch.patch, HDFS-2452-22branch.patch
>
>
> OutOfMemoryError brings down DataNode, when DataXceiverServer tries to spawn a new data
transfer thread.

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