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In case a partition fails, the replica fetcher thread would stop tracking the failed partition. A set failedPartitions would be used to keep a track of it. Instead of throwing an exception which ends up terminating the thread, an error message will be logged and the partition will be added to the failedPartitions set. The partition would be removed from the fetcherLagStats and partitionStates since partition lag cannot be accurately tracked once fetching is stopped. The thread would continue monitoring rest of the partitions which are lost in the current scenario. If all partitions for a fetcher thread are marked as failed, the thread would be shut down.

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