Redesisn DataNode volumeMap to include all types of Replicas
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Key: HDFS-509
URL: https://issues.apache.org/jira/browse/HDFS-509
Project: Hadoop HDFS
Issue Type: Sub-task
Components: data-node
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.21.0
With the new append design, replicas at a DataNode could be in one of the five
states: Finalized, ReplicaBeingWritten, ReplicaWaitingToBeRecovered,
ReplicaUnderRecovery, and Temporay. This jira is to
1. define the in-memory representation of these five types of replicas
2. define the on-disk representation of these replicas
2. redefine volumeMap to include all five types of replicas and remove
ongoingCreates map.
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