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Date: Tue, 13 Dec 2016 19:22:59 +0000 (UTC)
From: "Eric Badger (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13017347.1478110812000.511715.1481656979949@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-11094) Send back HAState along with
 NamespaceInfo during a versionRequest as an optional parameter
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archived-at: Tue, 13 Dec 2016 19:23:01 -0000


    [ https://issues.apache.org/jira/browse/HDFS-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15746006#comment-15746006 ] 

Eric Badger commented on HDFS-11094:
------------------------------------

[~liuml07], can you take a look at the latest 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
>         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-b2.patch, HDFS-11094.010.patch, HDFS-11094.011.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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