[
https://issues.apache.org/jira/browse/HDFS-6801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14099691#comment-14099691
]
Tsz Wo Nicholas Sze commented on HDFS-6801:
-------------------------------------------
> FileStoragePolicy says its still needs implementation.
We actually no longer need it since HDFS-6847 allows setting storage policy on
directories.
> 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
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
