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https://issues.apache.org/jira/browse/HADOOP-17859?focusedWorklogId=640913&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-640913
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ASF GitHub Bot logged work on HADOOP-17859:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 24/Aug/21 02:16
Start Date: 24/Aug/21 02:16
Worklog Time Spent: 10m
Work Description: acedia28 opened a new pull request #3323:
URL: https://github.com/apache/hadoop/pull/3323
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### Description of PR
UDP DNS query on YARN Registry DNS got connection timed out at times.
After checking logs on registry dns, we found the cause that size of UDP
Response is greater than Preallocated Byte buffer(4096)
We added failsafe case by returning input query with TC flag so that client
can know they should retried using TCP protocol.
### How was this patch tested?
We tested this case after patching and operating our cluster.
Connection timeout occured 10+ cases every week. After patching, 0 case
reported
### 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?
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Issue Time Tracking
-------------------
Worklog Id: (was: 640913)
Remaining Estimate: 0h
Time Spent: 10m
> DNS Query on DNS Registry got connection timed out at times.
> ------------------------------------------------------------
>
> Key: HADOOP-17859
> URL: https://issues.apache.org/jira/browse/HADOOP-17859
> Project: Hadoop Common
> Issue Type: Bug
> Components: registry
> Reporter: Jeongin Ju
> Priority: Minor
> Fix For: 3.1.2
>
> Attachments: HADOOP-17859.001.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> DNS query on YARN Registry DNS got connection timed out at times.
>
> After checking logs on registry dns, we found the cause that size of UDP
> Response is greater than Preallocated Byte buffer(4096)
>
> We added failsafe case by returning input query with TC flag so that client
> can know they should retried using TCP protocol.
>
>
> We found the problem and patched our cluster on 3.1.2 but it seems trunk
> still has the same problem.
> I attached patch based on the trunk.
>
> Thanks!
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