Wei-Chiu Chuang created HDFS-11633:
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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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