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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6482) Use block ID-based block layout on datanodes
Date Fri, 01 Aug 2014 22:47:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14083113#comment-14083113
] 

Colin Patrick McCabe commented on HDFS-6482:
--------------------------------------------

thanks, Chris

> Use block ID-based block layout on datanodes
> --------------------------------------------
>
>                 Key: HDFS-6482
>                 URL: https://issues.apache.org/jira/browse/HDFS-6482
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.5.0
>            Reporter: James Thomas
>            Assignee: James Thomas
>             Fix For: 3.0.0
>
>         Attachments: 6482-design.doc, HDFS-6482.1.patch, HDFS-6482.2.patch, HDFS-6482.3.patch,
HDFS-6482.4.patch, HDFS-6482.5.patch, HDFS-6482.6.patch, HDFS-6482.7.patch, HDFS-6482.8.patch,
HDFS-6482.9.patch, HDFS-6482.patch, hadoop-24-datanode-dir.tgz
>
>
> Right now blocks are placed into directories that are split into many subdirectories
when capacity is reached. Instead we can use a block's ID to determine the path it should
go in. This eliminates the need for the LDir data structure that facilitates the splitting
of directories when they reach capacity as well as fields in ReplicaInfo that keep track of
a replica's location.
> An extension of the work in HDFS-3290.



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