[jira] [Updated] (HDFS-11094) Send back HAState along with NamespaceInfo during a versionRequest as an optional parameter

["Mingliang Liu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mingliang Liu updated HDFS-11094:
---------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 3.0.0-alpha2
           Status: Resolved  (was: Patch Available)

I've just committed to {{trunk}} branch. I see conflicts when cherry-picking to {{branch-2}}. [~ebadger], can you provide a patch for branch-2 if this should go to {{branch-2}} as well? Thanks,

> 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
>             Fix For: 3.0.0-alpha2
>
>         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.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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