Stephan Ewen created FLINK-21935:
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Summary: Remove "state.backend.async" option.
Key: FLINK-21935
URL: https://issues.apache.org/jira/browse/FLINK-21935
Project: Flink
Issue Type: Improvement
Components: Runtime / State Backends
Reporter: Stephan Ewen
Fix For: 1.13.0
Checkpoints are always asynchronous, there is no case ever for a synchronous
checkpoint.
The RocksDB state backend doesn't even support synchronous snapshots, and the
HashMap Heap backend also has no good use case for synchronous snapshots (other
than a very minor reduction in heap objects).
Most importantly, we should not expose this option in the constructors of the
new state backend API classes, like {{HashMapStateBackend}}.
I marked this a blocker because it is part of the new user-facing State Backend
API and I would like to avoid that this option enters this API and causes
confusion when we eventually remove it.
/cc [~sjwiesman] and [~liyu]
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