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Date: Fri, 1 Aug 2014 02:30:38 +0000 (UTC)
From: "Tsz Wo Nicholas Sze (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-6801) Archival Storage: Add a new data
 migration tool
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Tsz Wo Nicholas Sze created HDFS-6801:
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             Summary: 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
            Reporter: Tsz Wo Nicholas Sze
            Assignee: Tsz Wo Nicholas Sze


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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