[jira] [Commented] (HDFS-6482) Use block ID-based block layout on datanodes

["Hudson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-6482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14645568#comment-14645568 ] 

Hudson commented on HDFS-6482:
------------------------------

FAILURE: Integrated in Hadoop-trunk-Commit #8236 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/8236/])
HDFS-8834. TestReplication is not valid after HDFS-6482. (Contributed by Lei Xu) (lei: rev f4f1b8b267703b8bebab06e17e69a4a4de611592)
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestReplication.java


> 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: 3.0.0
>            Reporter: James Thomas
>            Assignee: James Thomas
>             Fix For: 2.6.0
>
>         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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