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