[jira] [Created] (HDFS-12405) Complete remove "removed" state erasure coding policy during Namenode restart

["SammiChen (JIRA)" <ji...@apache.org>]

SammiChen created HDFS-12405:
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             Summary: Complete remove "removed" state erasure coding policy during Namenode restart
                 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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