Add diagnostic infomation (lastApplied,eventSourcingIndex,preserveLogSize) to warn log

Author: Taichi Yamakawa

src/main/scala/lerna/akka/entityreplication/raft/RaftActor.scala

@@ -475,11 +475,13 @@ private[raft] class RaftActor(
           log.warning(
             "[{}] Skipping compaction since compaction might not delete enough entries " +
             "(even if this compaction continues, the remaining entries will trigger new compaction at the next tick). " +
-            "Estimated compacted log size is [{}] entries. compaction.log-size-threshold is [{}] entries. " +
+            s"Estimated compacted log size is [{}] entries (lastApplied [{}], eventSourcingIndex [{}], preserveLogSize [${settings.compactionPreserveLogSize}]), " +
+            s"however compaction.log-size-threshold is [${settings.compactionLogSizeThreshold}] entries. " +
             "This warning happens if event sourcing is too slow or compaction is too fast.",
             currentState,
             estimatedCompactedLogSize,
-            settings.compactionLogSizeThreshold,
+            currentData.lastApplied,
+            currentData.eventSourcingIndex,
           )
         }
       } else {

src/test/scala/lerna/akka/entityreplication/raft/RaftActorSpec.scala

@@ -538,7 +538,8 @@ class RaftActorSpec extends TestKit(ActorSystem()) with RaftActorSpecBase {
         .warn(
           "[Follower] Skipping compaction since compaction might not delete enough entries " +
           "(even if this compaction continues, the remaining entries will trigger new compaction at the next tick). " +
-          "Estimated compacted log size is [3] entries. compaction.log-size-threshold is [3] entries. " +
+          "Estimated compacted log size is [3] entries (lastApplied [3], eventSourcingIndex [Some(0)], preserveLogSize [1]), " +
+          "however compaction.log-size-threshold is [3] entries. " +
           "This warning happens if event sourcing is too slow or compaction is too fast.",
         ).expect {
           val leaderMemberIndex = createUniqueMemberIndex()