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kafka-unclean-recovery.sh will attempt a "best-effort" approach and try to complete as many elections as it can within a time limit (or until the operator provides a SIGTERM). It should be expected that not all partitions in the input set will be "recovered" successfully. Possible failure modes are that either ElectLeadersRequest will fail or no successful GetReplicaLogInfoResponse was received in time for a given partition. Since designated leadership elections are idempotent (once a leader is elected, it is not possible to use designated leadership elections again until partition is again offline) operators can confidently run the tool multiple times. A zero exit status will be reported only if all elections for the input set are successful. Any failed elections will be logged to stderr. 

There are some caveats to using a command line tool for this system.

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