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From "Ankush Bhatiya (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HDFS-4630) Datanode is going OOM due to small files in hdfs
Date Sun, 24 Mar 2013 14:45:16 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4630?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ankush Bhatiya reopened HDFS-4630:
----------------------------------


this is not question, Its an issue Datanode going OOM due to incapability of holding all the
pointers to all the blocks.
                
> Datanode is going OOM due to small files in hdfs
> ------------------------------------------------
>
>                 Key: HDFS-4630
>                 URL: https://issues.apache.org/jira/browse/HDFS-4630
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode, namenode
>    Affects Versions: 2.0.0-alpha
>         Environment: Ubuntu, Java 1.6
>            Reporter: Ankush Bhatiya
>            Priority: Blocker
>
> Hi, 
> We have very small files(size ranging 10KB-1MB) in our hdfs and no of files are in tens
of millions. Due to this namenode and datanode both going out of memory very frequently. When
we analyse the head dump of datanode most of the memory was used by ReplicaMap. 
> Can we use EhCache or other to not to store all the data in memory? 
> Thanks
> Ankush

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