take into account C* process exit code while awaiting consistent state

[olegkovalenko]

MOTIVATION When due to misconfiguration C* process exits, executor continues to exist forever, node hangs in starting state.

PROPOSED CHANGE

• take into account C* process exit status while awaiting consistent state

RESULT: scheduler will receive task failed

NOTE: second part of solution is to add failover

[dmitrypekar]

Merged. Thanks for the update.

[olegkovalenko]

Thanks!