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https://issues.apache.org/jira/browse/HDFS-11708?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinayakumar B updated HDFS-11708:
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Attachment: HDFS-11708-02.patch
Updated the patch with addressed comments.
hedged read would pass even without these changes because there is ignoredNodes
map always maintained without clearing, so there was a chance to connect to
valid node and read the replica.
> positional read will fail if replicas moved to different DNs after stream is
> opened
> -----------------------------------------------------------------------------------
>
> Key: HDFS-11708
> URL: https://issues.apache.org/jira/browse/HDFS-11708
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.7.3
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
> Priority: Critical
> Attachments: HDFS-11708-01.patch, HDFS-11708-02.patch
>
>
> Scenario:
> 1. File was written to DN1, DN2 with RF=2
> 2. File stream opened to read and kept. Block Locations are [DN1,DN2]
> 3. One of the replica (DN2) moved to another datanode (DN3) due to datanode
> dead/balancing/etc.
> 4. Latest block locations in NameNode will be DN1 and DN3 in the 'same order'
> 5. DN1 went down, but not yet detected as dead in NameNode.
> 6. Client start reading using positional read api "read(pos, buf[], offset,
> length)"
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