Ethan Rose created HDDS-4480:
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Summary: Implement OM Prepare Request/Response
Key: HDDS-4480
URL: https://issues.apache.org/jira/browse/HDDS-4480
Project: Hadoop Distributed Data Store
Issue Type: Sub-task
Reporter: Ethan Rose
Assignee: Ethan Rose
Add the new OM request that will be used to prepare the OM for upgrade. In the
OzoneManagerStateMachine#preAppendTransaction (on the leader OM), this involves
turning on the prepare flag to only allow cancel or prepare requests through.
In the applyTransaction step for this request (on all OMs), this involves
setting the prepare flag, taking a snapshot, purging the log, and creating a
marker file with the prepare request's transaction log index. This transaction
log index will be returned in the response to the caller.
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