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https://issues.apache.org/jira/browse/HDFS-9390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15580625#comment-15580625
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Hadoop QA commented on HDFS-9390:
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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-9390 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-9390 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12833649/HDFS-9390-2-branch-2.patch
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| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17176/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Block management for maintenance states
> ---------------------------------------
>
>                 Key: HDFS-9390
>                 URL: https://issues.apache.org/jira/browse/HDFS-9390
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>         Attachments: HDFS-9390-2-branch-2.patch, HDFS-9390-2.patch, 
> HDFS-9390-3.patch, HDFS-9390-4.patch, HDFS-9390-5.patch, 
> HDFS-9390-branch-2.patch, HDFS-9390.patch
>
>
> When a node is transitioned to/stay in/transitioned out of maintenance state, 
> we need to make sure blocks w.r.t. that nodes are properly handled.
> * When nodes are put into maintenance, it will first go to 
> ENTERING_MAINTENANCE, and make sure blocks are minimally replicated before 
> the nodes are transitioned to IN_MAINTENANCE.
> * Do not replica blocks when nodes are in maintenance states. Maintenance 
> replica will remain in BlockMaps and thus is still considered valid from 
> block replication point of view. In other words, putting a node to 
> “maintenance” mode won’t trigger BlockManager to replicate its blocks.
> * Do not invalidate replicas on node under maintenance. After any file's 
> replication factor is reduced, NN needs to invalidate some replicas. It 
> should exclude nodes under maintenance in the handling.
> * Do not put IN_MAINTENANCE replicas in LocatedBlock for read operation.
> * Do not allocate any new block on nodes under maintenance.
> * Have Balancer exclude nodes under maintenance.
> * Exclude nodes under maintenance for DN cache.



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