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https://issues.apache.org/jira/browse/HDFS-6482?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron T. Myers updated HDFS-6482:
---------------------------------

    Fix Version/s:     (was: 2.5.0)

Hey James, just for future reference - we don't set the "fix version" field 
until the issue is actually resolved. The "target version" field is used to 
indicate what version a fix is intended for.

> 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
>         Attachments: HDFS-6482.patch
>
>
> 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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