Rakesh R commented on HDFS-10800:

Thanks [~umamaheswararao], +1(non-binding) lgtm.

Pending jenkins report.

> [SPS]: Daemon thread in Namenode to find blocks placed in other storage than 
> what the policy specifies
> ------------------------------------------------------------------------------------------------------
>                 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, HDFS-10800-HDFS-10285-04.patch, 
> HDFS-10800-HDFS-10285-05.patch
> This JIRA is for implementing a daemon thread called StoragePolicySatisfier 
> in namatode, which scans the asked files blocks which are placed in different 
> storages in DNs than the related policies specifie. 
>  The idea is:
>       # When user called on some files/dirs to satisfy storage policy, they 
> should have been tracked in NN and then StoragePolicySatisfier thread will 
> pick one by one file,  then check the blocks which might have been placed in 
> different storage in DN than what the storage policy is expecting it to.
>       # After checking all, it should also construct the data structures with 
> the required information to move a block from one storage to another.

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