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https://issues.apache.org/jira/browse/HADOOP-17877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18055314#comment-18055314
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ASF GitHub Bot commented on HADOOP-17877:
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eubnara opened a new pull request, #8216:
URL: https://github.com/apache/hadoop/pull/8216
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### Description of PR
DataNodeID.updateRegInfo() updates hostName but misses hostNameBytes.
Since PBHelperClient.convert(DatanodeID) uses getHostNameBytes() for protobuf
serialization, clients end up receiving the stale hostname from before the
re-registration.
This becomes a real problem when a DataNode first registers with a PQDN and
later re-registers with a FQDN. With dfs.client.use.datanode.hostname=true,
the client tries to connect using the old PQDN and fails with
UnknownHostException.
The fix is to add hostNameBytes = nodeReg.getHostNameBytes() in
updateRegInfo(),
same as how setIpAndXferPort() already handles ipAddr/ipAddrBytes together
### How was this patch tested?
- manual test on the private cluster
- add an unit test
### For code changes:
- [x] 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?
### AI Tooling
If an AI tool was used:
- [ ] The PR includes the phrase "Contains content generated by <tool>"
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> BuiltInGzipCompressor header and trailer should not be static variables
> -----------------------------------------------------------------------
>
> Key: HADOOP-17877
> URL: https://issues.apache.org/jira/browse/HADOOP-17877
> Project: Hadoop Common
> Issue Type: Bug
> Components: compress, io
> Affects Versions: 3.4.0
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Critical
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> In the newly added BuiltInGzipCompressor, we should not let header and
> trailer as static variables as they are for different instances.
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