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https://issues.apache.org/jira/browse/HDFS-9390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ming Ma updated HDFS-9390:
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Attachment: HDFS-9390-2-branch-2.patch
Updated branch-2 patches to address some of the checkstyle issues.
> 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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