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https://issues.apache.org/jira/browse/HDFS-10800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15487684#comment-15487684
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Uma Maheswara Rao G commented on HDFS-10800:
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Since HDFS-10800 is committed, I will generate patch based on that changes.
> [SPS]: Storage Policy Satisfier daemon thread in Namenode to find the blocks
> which were placed in other storages than what NN is expecting.
> -------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-10800
> URL: https://issues.apache.org/jira/browse/HDFS-10800
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: HDFS-10285
> Reporter: Uma Maheswara Rao G
> Assignee: Uma Maheswara Rao G
> Attachments: HDFS-10800-HDFS-10285-00.patch,
> HDFS-10800-HDFS-10285-01.patch
>
>
> This JIRA is for implementing a daemon thread called StoragePolicySatisfier
> in nematode, which should scan the asked files blocks which were placed in
> wrong storages in DNs.
> The idea is:
> # When user called on some files/dirs for satisfyStorage policy, They
> should have tracked in NN and then StoragePolicyDaemon thread will pick one
> by one file and then check the blocks which might have placed in wrong
> storage in DN than what NN is expecting it to.
> # After checking all, it should also construct the data structures for
> the required information to move a block from one storage to another.
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