[jira] [Created] (HDFS-9442) Move block replication logic from BlockManager to a new class ReplicationManager

["Mingliang Liu (JIRA)" <ji...@apache.org>]

Mingliang Liu created HDFS-9442:
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             Summary: 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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