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https://issues.apache.org/jira/browse/HDFS-6231?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo Nicholas Sze updated HDFS-6231:
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Hadoop Flags: Reviewed
+1 on the patch. Good catch!
> DFSClient hangs infinitely if using hedged reads and all eligible datanodes
> die.
> --------------------------------------------------------------------------------
>
> Key: HDFS-6231
> URL: https://issues.apache.org/jira/browse/HDFS-6231
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 3.0.0, 2.4.0
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Attachments: HDFS-6231.1.patch
>
>
> When using hedged reads, and all eligible datanodes for the read get flagged
> as dead or ignored, then the client is supposed to refetch block locations
> from the NameNode to retry the read. Instead, we've seen that the client can
> hang indefinitely.
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