[jira] [Commented] (HDFS-17752) Host2DatanodeMap will not update when re-register a node with a different hostname

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-17752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17932550#comment-17932550 ] 

ASF GitHub Bot commented on HDFS-17752:
---------------------------------------

liuwenjing17 opened a new pull request, #7468:
URL: https://github.com/apache/hadoop/pull/7468

   …with a different hostname
   
   
   ### Description of PR
   When same Dn restart with a different hostname, host2DatanodeMap needs to be updated accordingly.
   
   ### How was this patch tested?
   org.apache.hadoop.hdfs.server.blockmanagement.TestDatanodeManager#testHost2NodeMapCorrectAfterReregister
   
   ### For code changes:
   
   - [ ] Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
   - [ ] Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
   - [ ] If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under [ASF 2.0](http://www.apache.org/legal/resolved.html#category-a)?
   - [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`, `NOTICE-binary` files?
   
   




> Host2DatanodeMap will not update when re-register a node with a different hostname
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-17752
>                 URL: https://issues.apache.org/jira/browse/HDFS-17752
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: WenjingLiu
>            Priority: Major
>
> We have HBase RegionServer running, if a DataNode is re-registered with a different hostname, RegionServer will always treat this type of DataNode as a DeadNode, because host2DatanodeMap is not updated accordingly.



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