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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11633) FSImage load fallback may disable all erasure coding policies
Date Fri, 07 Apr 2017 07:18:41 GMT
Wei-Chiu Chuang created HDFS-11633:

             Summary: FSImage load fallback may disable all erasure coding policies 
                 Key: HDFS-11633
                 URL: https://issues.apache.org/jira/browse/HDFS-11633
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: erasure-coding, namenode
    Affects Versions: 3.0.0-alpha3
            Reporter: Wei-Chiu Chuang
            Assignee: Wei-Chiu Chuang
            Priority: Critical

If NameNode fails to load the fsimage in the first NameNode metadata directory, it accidentally
clears all enabled erasure coding policies in ErasureCodingPolicyManager.

Even if the NameNode configures multiple fsimage metadata directory and it successfully loads
the second one, enabled erasure coding policies are not restored.

In the current implementation, we do not have a ErasureCodingPolicyManager section in fsimage,
so a fsimage reload does not reload ECPM.

The easiest fix before ECPM section is implemented, is don't clear ECPM when FSNamesystem
is cleared.

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