src/kudu/consensus/replica_management.proto

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//   http://www.apache.org/licenses/LICENSE-2.0
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syntax = "proto2";
package kudu.consensus;

option java_package = "org.apache.kudu.consensus";

// Communicates replica management information between servers.
message ReplicaManagementInfoPB {
  // Replica replacement schemes.
  enum ReplacementScheme {
    UNKNOWN = 999;

    // The leader replica evicts the failed replica first, and then the new
    // voter replica is added (a.k.a. '3-2-3' replica management scheme).
    EVICT_FIRST = 0;

    // Add a new non-voter replica, promote the replica to voter once it
    // caught up with the leader, and only after that evict the failed replica
    // (a.k.a. '3-4-3' replica managment scheme).
    PREPARE_REPLACEMENT_BEFORE_EVICTION = 1;
  }

  // Using 'optional' instead of 'required' because at some point we may decide
  // to obsolete this field.
  optional ReplacementScheme replacement_scheme = 1;
}