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https://issues.apache.org/jira/browse/HADOOP-4910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hairong Kuang updated HADOOP-4910:
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Attachment: overReplicated.patch
I am still working on a junit testcase, but attaching the fix first.
Yes, this bug affects 0.17 as well as later releases.
> NameNode should exclude corrupt replicas when choosing excessive replicas to
> delete
> -----------------------------------------------------------------------------------
>
> Key: HADOOP-4910
> URL: https://issues.apache.org/jira/browse/HADOOP-4910
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.17.0
> Reporter: Hairong Kuang
> Attachments: overReplicated.patch
>
>
> Currently, when NameNode handles an over-replicated block in
> FSNamesystem#processOverReplicatedBlock, it excludes ones already in
> excessReplicateMap and decommissed ones, but it treats a corrupt replica as a
> valid one. This may lead to unnecessary deletion of more replicas and thus
> cause data lose. It should exclude corrupt replicas as well.
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