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