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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