Ming Ma updated HDFS-9390:
    Attachment: HDFS-9390-branch-2.patch

Here is the patch for branch-2. Note that the backport isn't trivial due to 
difference between branch-2 and trunk.

> 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.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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