When adding a new indexer to an existing Indexer Cluster, what is the best practice to ensure the indexer is ready before it starts receiving data?
The peer must complete the handshake with the CM to be active.
Why this answer
When adding a new indexer to an existing cluster, the correct procedure is to install and configure the indexer with the cluster master's address and the peer replication/search ports, then start the splunkd service and wait for the CM to acknowledge the peer's registration. Only after the CM registers the peer and begins streaming the cluster bundle and replicating buckets should the indexer be considered ready to receive data. This ensures the peer has the correct configuration and bucket state before participating in search and replication.
Exam trap
SPLK-2002 often tests whether candidates know the correct onboarding sequence for a new indexer peer — specifically that the CM must acknowledge registration before the peer is considered ready — versus disruptive or manual workarounds like copying buckets or restarting peers.
How to eliminate wrong answers
Option B is wrong because maintenance mode is used to temporarily stop a peer from receiving new data or participating in searches — it is not a step for onboarding a new peer. Option C is wrong because manually copying index buckets from other peers bypasses the cluster's replication mechanism and can corrupt bucket metadata or violate replication/search factor guarantees. Option D is wrong because restarting all existing peers is disruptive and unnecessary; the CM handles peer onboarding without cluster-wide restarts.
Option E is wrong because indexer discovery is a forwarder-side mechanism for finding indexers, not a step for registering a new peer with the cluster master.