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https://issues.apache.org/jira/browse/HDFS-11889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinayakumar B updated HDFS-11889:
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Status: Patch Available (was: Open)
> Datanodes should skip reading replicas from cache during Rollback
> -----------------------------------------------------------------
>
> Key: HDFS-11889
> URL: https://issues.apache.org/jira/browse/HDFS-11889
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, rolling upgrades
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
> Attachments: HDFS-11889-01.patch
>
>
> During rolling upgrade rollback, Datanodes should skip reading from replica
> cache file.
> Cache file will be written if
> 1. Datanodes shutdown gracefully by dfsadmin command.
> 2. For tests, {{Datanode.shutdown()}} is called.
> Cache file will not have entries of blocks restored from trash. So these
> blocks will not be reported back to Namenode until another directory scan
> happens.
> So avoid reading from cache even if exists if ROLLBACK option is used.
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