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https://issues.apache.org/jira/browse/HDFS-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15752846#comment-15752846
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Hudson commented on HDFS-11094:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #11004 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/11004/])
HDFS-11094. Send back HAState along with NamespaceInfo during a (liuml07: rev
ac0d402c6a3af784aa8bdceecf3293c30760346f)
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/proto/HdfsServer.proto
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPOfferService.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/proto/DatanodeProtocol.proto
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBPOfferService.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/NamespaceInfo.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelper.java
> 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: 2.9.0, 3.0.0-alpha2
>
> 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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