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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