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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10800) [SPS]: Storage Policy Satisfier daemon thread in Namenode to find the blocks which were placed in wrong storages than what NN is expecting.
Date Thu, 25 Aug 2016 23:34:20 GMT
Uma Maheswara Rao G created HDFS-10800:
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             Summary: [SPS]: Storage Policy Satisfier daemon thread in Namenode to find the
blocks which were placed in wrong 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
            Reporter: Uma Maheswara Rao G
            Assignee: Uma Maheswara Rao G


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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