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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11094) Send back HAState along with NamespaceInfo during a versionRequest as an optional parameter
Date Tue, 06 Dec 2016 20:51:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15726664#comment-15726664
] 

Mingliang Liu commented on HDFS-11094:
--------------------------------------

Thanks for bringing this up. If we agree to revert [HDFS-5079] in [HDFS-11207], we can firstly
revert this to avoid breaking the build in {{trunk}}. We need more input who evolved in [HDFS-5079]
before reverting it. For {{branch-2}} I won't commit the current patch.

> 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-b2.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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