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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4465) Optimize datanode ReplicasMap and ReplicaInfo
Date Wed, 03 Jul 2013 23:00:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699560#comment-13699560
] 

Suresh Srinivas commented on HDFS-4465:
---------------------------------------

+1 for the patch. I think we should get this into 2.1.0-beta given it is still waiting for
some blockers to be done. Note that there are two branches - branch-2.1 and branch-2.1.0.
                
> Optimize datanode ReplicasMap and ReplicaInfo
> ---------------------------------------------
>
>                 Key: HDFS-4465
>                 URL: https://issues.apache.org/jira/browse/HDFS-4465
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.0.5-alpha
>            Reporter: Suresh Srinivas
>            Assignee: Aaron T. Myers
>         Attachments: dn-memory-improvements.patch, HDFS-4465.patch, HDFS-4465.patch,
HDFS-4465.patch
>
>
> In Hadoop a lot of optimization has been done in namenode data structures to be memory
efficient. Similar optimizations are necessary for Datanode process. With the growth in storage
per datanode and number of blocks hosted on datanode, this jira intends to optimize long lived
ReplicasMap and ReplicaInfo objects.

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