Break FSDatasetInterface#writeToBlock() into writeToTemporary, writeToRBW, and
append
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Key: HDFS-543
URL: https://issues.apache.org/jira/browse/HDFS-543
Project: Hadoop HDFS
Issue Type: Sub-task
Components: data-node
Affects Versions: Append Branch
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: Append Branch
FSDatasetInterface#writeToBlock() currently allows to create/recover a
temporary replica, create/recover a RBW replica, or append to a replica. The
implementation of the method in FSDataset is very complicated and error prone.
I'd like to break this method into 3:
1. writeToTemporary allows to create a Temporary replica or recover from a
packet error for a Tempoary replica;
2. writeToRBW allows to create a RBW replica or recover from a packet error for
a RBW replica;
3. append allows to append to an existing Finalized replica.
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