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https://issues.apache.org/jira/browse/HDFS-12405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16164362#comment-16164362
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Kai Zheng commented on HDFS-12405:
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Hi Huafeng,
My thought is, the removed policies don't have to be cleaned up in time, so
doing the clean during NameNode start/restart is good enough.
> Clean up removed erasure coding policies from namenode
> ------------------------------------------------------
>
> Key: HDFS-12405
> URL: https://issues.apache.org/jira/browse/HDFS-12405
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: erasure-coding
> Reporter: SammiChen
> Assignee: Huafeng Wang
> Labels: hdfs-ec-3.0-nice-to-have
>
> 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 are no existing files or directories that use this
> "removed" policy. To find out whether there are files or directories which
> are using the policy is time consuming in runtime and might impact the
> Namenode performance. So a better choice is doing the work when NameNode
> restarts and loads Inodes. Collecting the information at that time will not
> introduce much extra overhead.
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