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From "Huafeng Wang (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HDFS-12405) Clean up removed erasure coding policies from namenode
Date Fri, 08 Sep 2017 07:41:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Huafeng Wang reassigned HDFS-12405:

    Assignee: Huafeng Wang

> 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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