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Once Auditor thread is started, auditor elector will go for the election to win the auditing job for Bookie cluster. Here, auditing job would be that, it has to detect the under-replicated ledgers in the cluster due to Bookie failures.

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Auditor will keep watch on the available Bookies in the cluster. Bookie will add its entry in the available bookie during Bookie server startup. So, when the Bookie is crashed or killed, Auditor will get a notification about the children change in available Bookie list. Auditor will immediately scan the complete ledger list related to that failed Bookie. On getting the details of ledgers, Auditor node publishes the under-replicated
ledgers in under-replication znode path in Zookeeper. After this, again it will be watching Bookie failures (by resetting Zookeeper watcher) on available Bookie list.

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