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https://issues.apache.org/jira/browse/HDFS-11633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang updated HDFS-11633:
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Attachment: (was: HDFS-11633.001.patch)
> FSImage loading 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
> Attachments: HDFS-11633.001.patch, HDFS-11633.test.patch
>
>
> 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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