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Redis High Availability with Sentinel Mastery Hub: The Indus

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Q1Domain Verified
In a Redis Sentinel cluster, what is the primary mechanism by which Sentinels detect a master node failure, and what is the typical time window for this detection under normal operating conditions?
Sentinels rely on `INFO` command responses every 10 seconds. A master is considered down if its `role` is not `master` in the `INFO` output for two consecutive checks.
Sentinels perform active health checks by executing `PING` commands every 5 seconds and expect a `PONG` within 2 seconds. Failure is declared if 3 consecutive `PING` commands fail.
Sentinels use a combination of passive and active checks. Passive checks involve monitoring the heartbeat from the master. Active checks involve Sentinels periodically sending `PING` commands to the master. A master is marked as Subjectively Down (SDOWN) if a Sentinel fails to receive a `PONG` reply to its `PING` within the configured `down-after-milliseconds` timeout, and a quorum of Sentinels agree it's objectively down (ODOWN).
Sentinels monitor TCP connection status to the master. If the connection drops for more than 1 second, the master is considered failed.
Q2Domain Verified
Consider a Redis Sentinel setup with three Sentinel instances (S1, S2, S3) monitoring a single Redis master. If the master becomes unresponsive, and S1 correctly identifies it as Subjectively Down (SDOWN), what is the minimum number of Sentinels that must also agree on the master's failure for it to be declared Objectively Down (ODOWN) and initiate a failover, assuming the default quorum configuration?
The quorum configuration is dynamic and depends on the number of active Sentinels.
2 (S1 and one other Sentinel)
1 (S1 itself)
3 (S1, S2, and S3)
Q3Domain Verified
asks about the *default* configuration. Question: When a Redis Sentinel failover occurs, which of the following is *NOT* a primary responsibility of the Sentinel responsible for coordinating the failover?
Identifying a suitable replica to promote to master.
Sending the `REPLICAOF NO ONE` command to the chosen replica.
Resetting the configuration cache of the old master (if it recovers).
Reconfiguring other replicas to replicate from the newly promoted master.

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This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

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