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https://issues.apache.org/jira/browse/HDFS-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Badger updated HDFS-11094:
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Attachment: HDFS-11094.010.patch
Attaching new trunk patch after the revert
> Send back HAState along with NamespaceInfo during a versionRequest as an
> optional parameter
> -------------------------------------------------------------------------------------------
>
> Key: HDFS-11094
> URL: https://issues.apache.org/jira/browse/HDFS-11094
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: Eric Badger
> Assignee: Eric Badger
> Attachments: HDFS-11094.001.patch, HDFS-11094.002.patch,
> HDFS-11094.003.patch, HDFS-11094.004.patch, HDFS-11094.005.patch,
> HDFS-11094.006.patch, HDFS-11094.007.patch, HDFS-11094.008.patch,
> HDFS-11094.009-b2.patch, HDFS-11094.009.patch, HDFS-11094.010.patch
>
>
> The datanode should know which NN is active when it is connecting/registering
> to the NN. Currently, it only figures this out during its first (and
> subsequent) heartbeat(s) and so there is a period of time where the datanode
> is alive and registered, but can't actually do anything because it doesn't
> know which NN is active. A byproduct of this is that the MiniDFSCluster will
> become active before it knows what NN is active, which can lead to NPEs when
> calling getActiveNN().
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