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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6801) Archival Storage: Add a new data migration tool
Date Fri, 19 Sep 2014 11:35:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14140385#comment-14140385
] 

Hudson commented on HDFS-6801:
------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #685 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/685/])
HDFS-6801. Archival Storage: Add a new data migration tool. Contributed by Tsz Wo Nicholas
Sze. (jing9: rev 5d5aae0694bc27df5b9fa50819854cd3050a8658)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/NameNodeConnector.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/mover/Mover.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/BlockStoragePolicy.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Dispatcher.java


> Archival Storage: Add a new data migration tool 
> ------------------------------------------------
>
>                 Key: HDFS-6801
>                 URL: https://issues.apache.org/jira/browse/HDFS-6801
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer, namenode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h6801_20140813.patch, h6801_20140814.patch, h6801_20140814b.patch,
h6801_20140817.patch, h6801_20140818.patch
>
>
> The tool is similar to Balancer.  It periodic scans the blocks in HDFS and uses path
and/or other meta data (e.g. mtime) to determine if a block should be cooled down (i.e. hot
=> warm, or warm => cold) or warmed up (i.e. cold => warm, or warm => hot).  In
contrast to Balancer, the migration tool always move replicas to a different storage type.
 Similar to Balancer, the replicas are moved in a way that the number of racks the block does
not decrease.



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