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Previously the LogCleaner chores had their own ZK client. If they encounter Session expired error, the LogCleaner chore will never succeed again despite the HMaster continuing to run. With this change, the LogCleaner chores now share the underlying ZK of the HMaster (similar to HFileCleaner chores). So now, if an unrecoverable session expiration occurs, the hmaster will abort and cleaner chores will not be left as zombies.
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Previously the LogCleaner chores had their own ZK client. If they encounter Session expired error, the LogCleaner chore will never succeed again despite the HMaster continuing to run. With this change, the LogCleaner chores now share the underlying ZK of the HMaster (similar to HFileCleaner chores). So now, if an unrecoverable session expiration occurs, the hmaster will abort and cleaner chores will not be left as zombies.
Sub-task
Major
Peter Somogyi