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From "Eric Badger (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11094) Send back HAState along with NamespaceInfo during a versionRequest as an optional parameter
Date Thu, 15 Dec 2016 20:25:58 GMT

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

Eric Badger updated HDFS-11094:
-------------------------------
    Attachment: HDFS-11094-branch-2.011.patch

Uploading branch-2 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-branch-2.011.patch, 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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