THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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All edge cases (like new isr set is empty) are handled similarly to offlinePartionLeaderSelector.
Open questions
1. Disk availability check operation
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Does it makes sense to retry operation before firing restart partitions?
Compatibility, Deprecation, and Migration Plan
No public interfaces changes. Users won't have to restart brokers on IO errors (e.g. after disk becomes unavailable).
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