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From "SammiChen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12405) Complete remove "removed" state erasure coding policy during Namenode restart
Date Fri, 08 Sep 2017 06:54:00 GMT
SammiChen created HDFS-12405:

             Summary: Complete remove "removed" state erasure coding policy during Namenode
                 Key: HDFS-12405
                 URL: https://issues.apache.org/jira/browse/HDFS-12405
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: erasure-coding
            Reporter: SammiChen

Currently, when an erasure coding policy is removed, it's been transited to "removed" state.
User cannot apply policy with "removed" state to file/directory anymore.  The policy cannot
be safely removed from the system unless we know there is no existing files or directories
use this "remove" policy. To find out whether there is files or directories which are using
the policy is time consuming in runtime and might impact the Namenode performance. So a better
choice is do the work when NameNode restarts and loads Inode one by one. Collect the information
at that time will not introduce much extra workloads. 

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