THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Since the two replica fetchers (ReplicaFetcherThread and ReplicaAlterLogDirsThread) are quite similar in behavior and are extended from the same class, probably should not make one deviate much from the other.
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- Retries: Whenever a partition failure occursfails, retries from the thread would keep retryinglead to partition failure exceptions repeatedly.