Sumit Agrawal created HDDS-11116:
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Summary: OM state machine move to readonly mode on failure
Key: HDDS-11116
URL: https://issues.apache.org/jira/browse/HDDS-11116
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Sumit Agrawal
Assignee: Sumit Agrawal
When OM statemachine receives any unknown failure (other than IOException
type), it results in termination of OM.
Its observed that same failure is applied to other om nodes, while
applyTransaction, as raft log is already replicated to minimum number of nodes
in quorum before applyTransaction.
Till recovery method is not applied, OM remains down. So as to provide read
only service, can move OM to read only mode, where read operation is allowed
over leader.
Few points in consideration:
# Need block applyTransaction of raft log in readonly mode to avoid running
transaction on previous failed operation
# Need support Read operation over read only mode (as leader election will
happen, but leader will not be ready till latest transaction is updated)
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