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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4465) Optimize datanode ReplicasMap and ReplicaInfo
Date Wed, 03 Jul 2013 23:06:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699566#comment-13699566
] 

Aaron T. Myers commented on HDFS-4465:
--------------------------------------

That sounds fine to me. Do all of those branches already have HDFS-4635 and HDFS-4797? If
not, those will need to be included as well.
                
> 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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