Measure follower activity in nanoseconds

[controller.git] / opendaylight / md-sal / sal-akka-raft / src / main / java / org / opendaylight / controller / cluster / raft / behaviors / Leader.java

diff --git a/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/behaviors/Leader.java b/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/behaviors/Leader.java
index 4821d98835371c299c27776a81c4d9998501399d..eb49abc17aea4a0ebefacde0a5925312082e1405 100644 (file)
--- a/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/behaviors/Leader.java
+++ b/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/behaviors/Leader.java
@@ -10,6 +10,7 @@ package org.opendaylight.controller.cluster.raft.behaviors;
 import akka.actor.ActorRef;
 import akka.actor.ActorSelection;
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Optional;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Stopwatch;
 import java.util.concurrent.TimeUnit;
@@ -24,7 +25,8 @@ import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
 
 /**
  * The behavior of a RaftActor when it is in the Leader state.
- * <p/>
+ *
+ * <p>
  * Leaders:
  * <ul>
  * <li> Upon election: send initial empty AppendEntries RPCs
@@ -38,7 +40,7 @@ import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
  * follower (§5.3)
  * <li> If AppendEntries fails because of log inconsistency:
  * decrement nextIndex and retry (§5.3)
- * <li> If there exists an N such that N > commitIndex, a majority
+ * <li> If there exists an N such that N &gt; commitIndex, a majority
  * of matchIndex[i] ≥ N, and log[N].term == currentTerm:
  * set commitIndex = N (§5.3, §5.4).
  * </ul>
@@ -107,14 +109,14 @@ public class Leader extends AbstractLeader {
      * <li>Start a timer (Stopwatch).</li>
      * <li>Send an initial AppendEntries heartbeat to all followers.</li>
      * <li>On AppendEntriesReply, check if the follower's new match Index matches the leader's last index</li>
-     * <li>If it matches, </li>
+     * <li>If it matches,
      *   <ul>
      *   <li>Send an additional AppendEntries to ensure the follower has applied all its log entries to its state.</li>
      *   <li>Send an ElectionTimeout to the follower to immediately start an election.</li>
      *   <li>Notify {@link RaftActorLeadershipTransferCohort#transferComplete}.</li>
-     *   </ul>
+     *   </ul></li>
      * <li>Otherwise if the election time out period elapses, notify
-     *     {@link RaftActorLeadershipTransferCohort#abortTtransfer}.</li>
+     *     {@link RaftActorLeadershipTransferCohort#abortTransfer}.</li>
      * </ul>
      *
      * @param leadershipTransferCohort the cohort participating in the leadership transfer
@@ -133,6 +135,13 @@ public class Leader extends AbstractLeader {
             return;
         }
 
+        final Optional<String> requestedFollowerIdOptional
+                = leadershipTransferContext.transferCohort.getRequestedFollowerId();
+        if (requestedFollowerIdOptional.isPresent() && !requestedFollowerIdOptional.get().equals(followerId)) {
+            // we want to transfer leadership to specific follower
+            return;
+        }
+
         FollowerLogInformation followerInfo = getFollower(followerId);
         if (followerInfo == null) {
             return;