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https://issues.apache.org/jira/browse/HDFS-15067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17011790#comment-17011790
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Hadoop QA commented on HDFS-15067:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  7s{color} 
| {color:red} HDFS-15067 does not apply to trunk. Rebase required? Wrong 
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-15067 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12990421/HDFS-15067.01.patch |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/28625/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


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> Optimize heartbeat for large cluster
> ------------------------------------
>
>                 Key: HDFS-15067
>                 URL: https://issues.apache.org/jira/browse/HDFS-15067
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 3.1.1
>            Reporter: Surendra Singh Lilhore
>            Assignee: Surendra Singh Lilhore
>            Priority: Major
>         Attachments: HDFS-15067.01.patch, image-2020-01-09-18-00-49-556.png
>
>
> In a large cluster Namenode spend some time in processing heartbeats. For 
> example, in 10K node cluster namenode process 10K RPC's for heartbeat in each 
> 3sec. This will impact the client response time. This heart beat can be 
> optimized. DN can start skipping one heart beat if no 
> work(Write/replication/Delete) is allocated from long time. DN can start 
> sending heart beat in 6 sec. Once the DN stating getting work from NN , it 
> can start sending heart beat normally.



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