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https://issues.apache.org/jira/browse/HDFS-9442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15012804#comment-15012804
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Mingliang Liu commented on HDFS-9442:
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I think we can work on {{trunk}} branch for this issue.
As some code that accesses {{UnderReplicatedBlocks}} is more complicated than
others, we can move it gradually for easier code review and test.
> Move block replication logic from BlockManager to a new class
> ReplicationManager
> --------------------------------------------------------------------------------
>
> Key: HDFS-9442
> URL: https://issues.apache.org/jira/browse/HDFS-9442
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
>
> Currently the {{BlockManager}} is managing all replication logic for over- ,
> under- and mis-replicated blocks. This jira proposes to move that code to a
> new class named {{ReplicationManager}} for cleaner code logic, shorter source
> files, and easier lock separating work in future.
> The {{ReplicationManager}} is a package local class, providing
> {{BlockManager}} with methods that accesses its internal data structures of
> replication queue. Meanwhile, the class maintains the lifecycle of
> {{replicationThread}} and {{replicationQueuesInitializer}} daemon.
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