Add preliminary QJournalProtocol interface, translators
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Key: HDFS-3189
URL: https://issues.apache.org/jira/browse/HDFS-3189
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha
Affects Versions: 2.0.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
This JIRA is to add the preliminary code for the QJournalProtocol. This
protocol differs from JournalProtocol in the following ways:
- each call has context information indicating the epoch number of the requester
- it contains calls that are specific to epoch number generation, etc, which do
not apply to other journaling daemons such as the BackupNode
My guess is that, at some point, we can merge back down to one protocol, but
during the initial implementation phase, it will be useful to have a distinct
protocol for this project.
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