Uma Maheswara Rao G updated HDFS-10800:
    Attachment: HDFS-10800-HDFS-10285-03.patch

Thank you [~rakeshr] for the review.
I have updated the patch fixing all your comments. for #4) I have left as is. 
We can refine later after adding dynamic start/stop option. TODO was there 
about the same. Thanks

Please review!

> [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, HDFS-10800-HDFS-10285-02.patch, 
> HDFS-10800-HDFS-10285-03.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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