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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