Till Rohrmann created FLINK-7078:
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Summary: Support fencing tokens to filter out outdated messages
Key: FLINK-7078
URL: https://issues.apache.org/jira/browse/FLINK-7078
Project: Flink
Issue Type: Sub-task
Components: Distributed Coordination
Reporter: Till Rohrmann
In order to guard against split brain situations, it is important that RPC
calls are guarded with a fencing token. The sender attaches his fencing token
to a RPC message which is then used on the receiver side to compare against the
expected fencing token. An example is the leader session ID which we attach to
all critical RPC messages.
So far, in the Flip-6 code base we send fencing tokens explicitly. This is not
only cumbersome but also error-prone because you have to do it for all RPCs.
Therefore, it would be better if we could automatically compare fencing tokens
for a given RPC from a given source. This should ideally happen on the level of
the RPC server.
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