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Posted to hdfs-issues@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2016/12/02 22:11:58 UTC
[jira] [Commented] (HDFS-11094) Send back HAState along with
NamespaceInfo during a versionRequest as an optional parameter
[ https://issues.apache.org/jira/browse/HDFS-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15716687#comment-15716687 ]
Kihwal Lee commented on HDFS-11094:
-----------------------------------
bq. For the unit test, can we set a very large heartbeat interval in configuration, and check the active NN is not null after cluster.waitForActive()?
I think the existing tests are quite adequate. I understand that a full-blown mini cluster is sometimes needed to test the distributed file system. However, we should avoid adding such end-to-end tests if it is possible to have reasonable unit tests.
> 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.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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