BUG 2718 : Create a diagnostic utility to track append entries replies
[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / Shard.java
index 9cd758ba30fdb94e85cd1703d99a8e0c55a50a17..9551c800ca003788de3beaf2898e48e4809cf1bb 100644 (file)
@@ -12,8 +12,6 @@ import akka.actor.ActorRef;
 import akka.actor.ActorSelection;
 import akka.actor.Cancellable;
 import akka.actor.Props;
-import akka.event.Logging;
-import akka.event.LoggingAdapter;
 import akka.japi.Creator;
 import akka.persistence.RecoveryFailure;
 import akka.serialization.Serialization;
@@ -62,10 +60,12 @@ import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContex
 import org.opendaylight.controller.cluster.datastore.modification.Modification;
 import org.opendaylight.controller.cluster.datastore.modification.ModificationPayload;
 import org.opendaylight.controller.cluster.datastore.modification.MutableCompositeModification;
+import org.opendaylight.controller.cluster.datastore.utils.MessageTracker;
 import org.opendaylight.controller.cluster.datastore.utils.SerializationUtils;
 import org.opendaylight.controller.cluster.notifications.RoleChangeNotifier;
 import org.opendaylight.controller.cluster.raft.RaftActor;
 import org.opendaylight.controller.cluster.raft.ReplicatedLogEntry;
+import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
 import org.opendaylight.controller.cluster.raft.protobuff.client.messages.CompositeModificationByteStringPayload;
 import org.opendaylight.controller.cluster.raft.protobuff.client.messages.CompositeModificationPayload;
 import org.opendaylight.controller.cluster.raft.protobuff.client.messages.Payload;
@@ -101,9 +101,6 @@ public class Shard extends RaftActor {
     // The state of this Shard
     private final InMemoryDOMDataStore store;
 
-    private final LoggingAdapter LOG =
-        Logging.getLogger(getContext().system(), this);
-
     /// The name of this shard
     private final ShardIdentifier name;
 
@@ -130,6 +127,8 @@ public class Shard extends RaftActor {
 
     private final Optional<ActorRef> roleChangeNotifier;
 
+    private final MessageTracker appendEntriesReplyTracker;
+
     /**
      * Coordinates persistence recovery on startup.
      */
@@ -148,7 +147,7 @@ public class Shard extends RaftActor {
         this.schemaContext = schemaContext;
         this.dataPersistenceProvider = (datastoreContext.isPersistent()) ? new PersistentDataProvider() : new NonPersistentRaftDataProvider();
 
-        LOG.info("Shard created : {} persistent : {}", name, datastoreContext.isPersistent());
+        LOG.info("Shard created : {}, persistent : {}", name, datastoreContext.isPersistent());
 
         store = InMemoryDOMDataStoreFactory.create(name.toString(), null,
                 datastoreContext.getDataStoreProperties());
@@ -166,13 +165,16 @@ public class Shard extends RaftActor {
         }
 
         commitCoordinator = new ShardCommitCoordinator(TimeUnit.SECONDS.convert(1, TimeUnit.MINUTES),
-                datastoreContext.getShardTransactionCommitQueueCapacity());
+                datastoreContext.getShardTransactionCommitQueueCapacity(), LOG, name.toString());
 
         transactionCommitTimeout = TimeUnit.MILLISECONDS.convert(
                 datastoreContext.getShardTransactionCommitTimeoutInSeconds(), TimeUnit.SECONDS);
 
         // create a notifier actor for each cluster member
         roleChangeNotifier = createRoleChangeNotifier(name.toString());
+
+        appendEntriesReplyTracker = new MessageTracker(AppendEntriesReply.class,
+                getRaftActorContext().getConfigParams().getIsolatedCheckIntervalInMillis());
     }
 
     private static Map<String, String> mapPeerAddresses(
@@ -216,52 +218,63 @@ public class Shard extends RaftActor {
     @Override
     public void onReceiveRecover(final Object message) throws Exception {
         if(LOG.isDebugEnabled()) {
-            LOG.debug("onReceiveRecover: Received message {} from {}",
-                message.getClass().toString(),
-                getSender());
+            LOG.debug("{}: onReceiveRecover: Received message {} from {}", persistenceId(),
+                message.getClass().toString(), getSender());
         }
 
         if (message instanceof RecoveryFailure){
-            LOG.error(((RecoveryFailure) message).cause(), "Recovery failed because of this cause");
+            LOG.error("{}: Recovery failed because of this cause",
+                    persistenceId(), ((RecoveryFailure) message).cause());
 
             // Even though recovery failed, we still need to finish our recovery, eg send the
             // ActorInitialized message and start the txCommitTimeoutCheckSchedule.
             onRecoveryComplete();
         } else {
             super.onReceiveRecover(message);
+            if(LOG.isTraceEnabled()) {
+                appendEntriesReplyTracker.begin();
+            }
         }
     }
 
     @Override
     public void onReceiveCommand(final Object message) throws Exception {
-        if(LOG.isDebugEnabled()) {
-            LOG.debug("onReceiveCommand: Received message {} from {}", message, getSender());
-        }
-
-        if (message.getClass().equals(CreateTransaction.SERIALIZABLE_CLASS)) {
-            handleCreateTransaction(message);
-        } else if(message instanceof ForwardedReadyTransaction) {
-            handleForwardedReadyTransaction((ForwardedReadyTransaction)message);
-        } else if(message.getClass().equals(CanCommitTransaction.SERIALIZABLE_CLASS)) {
-            handleCanCommitTransaction(CanCommitTransaction.fromSerializable(message));
-        } else if(message.getClass().equals(CommitTransaction.SERIALIZABLE_CLASS)) {
-            handleCommitTransaction(CommitTransaction.fromSerializable(message));
-        } else if(message.getClass().equals(AbortTransaction.SERIALIZABLE_CLASS)) {
-            handleAbortTransaction(AbortTransaction.fromSerializable(message));
-        } else if (message.getClass().equals(CloseTransactionChain.SERIALIZABLE_CLASS)){
-            closeTransactionChain(CloseTransactionChain.fromSerializable(message));
-        } else if (message instanceof RegisterChangeListener) {
-            registerChangeListener((RegisterChangeListener) message);
-        } else if (message instanceof UpdateSchemaContext) {
-            updateSchemaContext((UpdateSchemaContext) message);
-        } else if (message instanceof PeerAddressResolved) {
-            PeerAddressResolved resolved = (PeerAddressResolved) message;
-            setPeerAddress(resolved.getPeerId().toString(),
-                resolved.getPeerAddress());
-        } else if(message.equals(TX_COMMIT_TIMEOUT_CHECK_MESSAGE)) {
-            handleTransactionCommitTimeoutCheck();
-        } else {
-            super.onReceiveCommand(message);
+
+        MessageTracker.Context context = appendEntriesReplyTracker.received(message);
+
+        if(context.error().isPresent()){
+            LOG.trace("{} : AppendEntriesReply failed to arrive at the expected interval {}", persistenceId(),
+                    context.error());
+        }
+
+        try {
+            if (message.getClass().equals(CreateTransaction.SERIALIZABLE_CLASS)) {
+                handleCreateTransaction(message);
+            } else if (message instanceof ForwardedReadyTransaction) {
+                handleForwardedReadyTransaction((ForwardedReadyTransaction) message);
+            } else if (message.getClass().equals(CanCommitTransaction.SERIALIZABLE_CLASS)) {
+                handleCanCommitTransaction(CanCommitTransaction.fromSerializable(message));
+            } else if (message.getClass().equals(CommitTransaction.SERIALIZABLE_CLASS)) {
+                handleCommitTransaction(CommitTransaction.fromSerializable(message));
+            } else if (message.getClass().equals(AbortTransaction.SERIALIZABLE_CLASS)) {
+                handleAbortTransaction(AbortTransaction.fromSerializable(message));
+            } else if (message.getClass().equals(CloseTransactionChain.SERIALIZABLE_CLASS)) {
+                closeTransactionChain(CloseTransactionChain.fromSerializable(message));
+            } else if (message instanceof RegisterChangeListener) {
+                registerChangeListener((RegisterChangeListener) message);
+            } else if (message instanceof UpdateSchemaContext) {
+                updateSchemaContext((UpdateSchemaContext) message);
+            } else if (message instanceof PeerAddressResolved) {
+                PeerAddressResolved resolved = (PeerAddressResolved) message;
+                setPeerAddress(resolved.getPeerId().toString(),
+                        resolved.getPeerAddress());
+            } else if (message.equals(TX_COMMIT_TIMEOUT_CHECK_MESSAGE)) {
+                handleTransactionCommitTimeoutCheck();
+            } else {
+                super.onReceiveCommand(message);
+            }
+        } finally {
+            context.done();
         }
     }
 
@@ -275,8 +288,8 @@ public class Shard extends RaftActor {
         if(cohortEntry != null) {
             long elapsed = System.currentTimeMillis() - cohortEntry.getLastAccessTime();
             if(elapsed > transactionCommitTimeout) {
-                LOG.warning("Current transaction {} has timed out after {} ms - aborting",
-                        cohortEntry.getTransactionID(), transactionCommitTimeout);
+                LOG.warn("{}: Current transaction {} has timed out after {} ms - aborting",
+                        persistenceId(), cohortEntry.getTransactionID(), transactionCommitTimeout);
 
                 doAbortTransaction(cohortEntry.getTransactionID(), null);
             }
@@ -286,7 +299,7 @@ public class Shard extends RaftActor {
     private void handleCommitTransaction(final CommitTransaction commit) {
         final String transactionID = commit.getTransactionID();
 
-        LOG.debug("Committing transaction {}", transactionID);
+        LOG.debug("{}: Committing transaction {}", persistenceId(), transactionID);
 
         // Get the current in-progress cohort entry in the commitCoordinator if it corresponds to
         // this transaction.
@@ -295,8 +308,8 @@ public class Shard extends RaftActor {
             // We're not the current Tx - the Tx was likely expired b/c it took too long in
             // between the canCommit and commit messages.
             IllegalStateException ex = new IllegalStateException(
-                    String.format("Cannot commit transaction %s - it is not the current transaction",
-                            transactionID));
+                    String.format("%s: Cannot commit transaction %s - it is not the current transaction",
+                            persistenceId(), transactionID));
             LOG.error(ex.getMessage());
             shardMBean.incrementFailedTransactionsCount();
             getSender().tell(new akka.actor.Status.Failure(ex), getSelf());
@@ -322,9 +335,9 @@ public class Shard extends RaftActor {
                 Shard.this.persistData(getSender(), transactionID,
                         new ModificationPayload(cohortEntry.getModification()));
             }
-        } catch (InterruptedException | ExecutionException | IOException e) {
-            LOG.error(e, "An exception occurred while preCommitting transaction {}",
-                    cohortEntry.getTransactionID());
+        } catch (Exception e) {
+            LOG.error("{} An exception occurred while preCommitting transaction {}",
+                    persistenceId(), cohortEntry.getTransactionID(), e);
             shardMBean.incrementFailedTransactionsCount();
             getSender().tell(new akka.actor.Status.Failure(e), getSelf());
         }
@@ -352,8 +365,8 @@ public class Shard extends RaftActor {
                 // This really shouldn't happen - it likely means that persistence or replication
                 // took so long to complete such that the cohort entry was expired from the cache.
                 IllegalStateException ex = new IllegalStateException(
-                        String.format("Could not finish committing transaction %s - no CohortEntry found",
-                                transactionID));
+                        String.format("%s: Could not finish committing transaction %s - no CohortEntry found",
+                                persistenceId(), transactionID));
                 LOG.error(ex.getMessage());
                 sender.tell(new akka.actor.Status.Failure(ex), getSelf());
             }
@@ -361,7 +374,7 @@ public class Shard extends RaftActor {
             return;
         }
 
-        LOG.debug("Finishing commit for transaction {}", cohortEntry.getTransactionID());
+        LOG.debug("{}: Finishing commit for transaction {}", persistenceId(), cohortEntry.getTransactionID());
 
         try {
             // We block on the future here so we don't have to worry about possibly accessing our
@@ -374,24 +387,25 @@ public class Shard extends RaftActor {
             shardMBean.incrementCommittedTransactionCount();
             shardMBean.setLastCommittedTransactionTime(System.currentTimeMillis());
 
-        } catch (InterruptedException | ExecutionException e) {
+        } catch (Exception e) {
             sender.tell(new akka.actor.Status.Failure(e), getSelf());
 
-            LOG.error(e, "An exception occurred while committing transaction {}", transactionID);
+            LOG.error("{}, An exception occurred while committing transaction {}", persistenceId(),
+                    transactionID, e);
             shardMBean.incrementFailedTransactionsCount();
+        } finally {
+            commitCoordinator.currentTransactionComplete(transactionID, true);
         }
-
-        commitCoordinator.currentTransactionComplete(transactionID, true);
     }
 
     private void handleCanCommitTransaction(final CanCommitTransaction canCommit) {
-        LOG.debug("Can committing transaction {}", canCommit.getTransactionID());
+        LOG.debug("{}: Can committing transaction {}", persistenceId(), canCommit.getTransactionID());
         commitCoordinator.handleCanCommit(canCommit, getSender(), self());
     }
 
     private void handleForwardedReadyTransaction(ForwardedReadyTransaction ready) {
-        LOG.debug("Readying transaction {}, client version {}", ready.getTransactionID(),
-                ready.getTxnClientVersion());
+        LOG.debug("{}: Readying transaction {}, client version {}", persistenceId(),
+                ready.getTransactionID(), ready.getTxnClientVersion());
 
         // This message is forwarded by the ShardTransaction on ready. We cache the cohort in the
         // commitCoordinator in preparation for the subsequent three phase commit initiated by
@@ -406,7 +420,7 @@ public class Shard extends RaftActor {
         // to provide the compatible behavior.
         ActorRef replyActorPath = self();
         if(ready.getTxnClientVersion() < DataStoreVersions.HELIUM_1_VERSION) {
-            LOG.debug("Creating BackwardsCompatibleThreePhaseCommitCohort");
+            LOG.debug("{}: Creating BackwardsCompatibleThreePhaseCommitCohort", persistenceId());
             replyActorPath = getContext().actorOf(BackwardsCompatibleThreePhaseCommitCohort.props(
                     ready.getTransactionID()));
         }
@@ -424,7 +438,7 @@ public class Shard extends RaftActor {
     void doAbortTransaction(final String transactionID, final ActorRef sender) {
         final CohortEntry cohortEntry = commitCoordinator.getCohortEntryIfCurrent(transactionID);
         if(cohortEntry != null) {
-            LOG.debug("Aborting transaction {}", transactionID);
+            LOG.debug("{}: Aborting transaction {}", persistenceId(), transactionID);
 
             // We don't remove the cached cohort entry here (ie pass false) in case the Tx was
             // aborted during replication in which case we may still commit locally if replication
@@ -446,7 +460,7 @@ public class Shard extends RaftActor {
 
                 @Override
                 public void onFailure(final Throwable t) {
-                    LOG.error(t, "An exception happened during abort");
+                    LOG.error("{}: An exception happened during abort", persistenceId(), t);
 
                     if(sender != null) {
                         sender.tell(new akka.actor.Status.Failure(t), self);
@@ -462,10 +476,10 @@ public class Shard extends RaftActor {
         } else if (getLeader() != null) {
             getLeader().forward(message, getContext());
         } else {
-            getSender().tell(new akka.actor.Status.Failure(new NoShardLeaderException(
-                "Could not find shard leader so transaction cannot be created. This typically happens" +
+            getSender().tell(new akka.actor.Status.Failure(new NoShardLeaderException(String.format(
+                "Could not find leader for shard %s so transaction cannot be created. This typically happens" +
                 " when the system is coming up or recovering and a leader is being elected. Try again" +
-                " later.")), getSelf());
+                " later.", persistenceId()))), getSelf());
         }
     }
 
@@ -503,7 +517,7 @@ public class Shard extends RaftActor {
 
             return getContext().actorOf(
                 ShardTransaction.props(factory.newReadOnlyTransaction(), getSelf(),
-                        schemaContext,datastoreContext, shardMBean,
+                        schemaContext, datastoreContext, shardMBean,
                         transactionId.getRemoteTransactionId(), clientVersion),
                         transactionId.toString());
 
@@ -556,7 +570,7 @@ public class Shard extends RaftActor {
                 .build();
 
         if(LOG.isDebugEnabled()) {
-            LOG.debug("Creating transaction : {} ", transactionId);
+            LOG.debug("{}: Creating transaction : {} ", persistenceId(), transactionId);
         }
 
         ActorRef transactionActor = createTypedTransactionActor(transactionType, transactionId,
@@ -581,7 +595,7 @@ public class Shard extends RaftActor {
             shardMBean.setLastCommittedTransactionTime(System.currentTimeMillis());
         } catch (InterruptedException | ExecutionException e) {
             shardMBean.incrementFailedTransactionsCount();
-            LOG.error(e, "Failed to commit");
+            LOG.error("{}: Failed to commit", persistenceId(), e);
         }
     }
 
@@ -598,14 +612,14 @@ public class Shard extends RaftActor {
 
     private void registerChangeListener(final RegisterChangeListener registerChangeListener) {
 
-        LOG.debug("registerDataChangeListener for {}", registerChangeListener.getPath());
+        LOG.debug("{}: registerDataChangeListener for {}", persistenceId(), registerChangeListener.getPath());
 
         ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier,
                                                      NormalizedNode<?, ?>>> registration;
         if(isLeader()) {
             registration = doChangeListenerRegistration(registerChangeListener);
         } else {
-            LOG.debug("Shard is not the leader - delaying registration");
+            LOG.debug("{}: Shard is not the leader - delaying registration", persistenceId());
 
             DelayedListenerRegistration delayedReg =
                     new DelayedListenerRegistration(registerChangeListener);
@@ -616,8 +630,8 @@ public class Shard extends RaftActor {
         ActorRef listenerRegistration = getContext().actorOf(
                 DataChangeListenerRegistration.props(registration));
 
-        LOG.debug("registerDataChangeListener sending reply, listenerRegistrationPath = {} ",
-                    listenerRegistration.path());
+        LOG.debug("{}: registerDataChangeListener sending reply, listenerRegistrationPath = {} ",
+                persistenceId(), listenerRegistration.path());
 
         getSender().tell(new RegisterChangeListenerReply(listenerRegistration.path()), getSelf());
     }
@@ -641,7 +655,7 @@ public class Shard extends RaftActor {
         AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener =
                 new DataChangeListenerProxy(dataChangeListenerPath);
 
-        LOG.debug("Registering for path {}", registerChangeListener.getPath());
+        LOG.debug("{}: Registering for path {}", persistenceId(), registerChangeListener.getPath());
 
         return store.registerChangeListener(registerChangeListener.getPath(), listener,
                 registerChangeListener.getScope());
@@ -658,7 +672,7 @@ public class Shard extends RaftActor {
         currentLogRecoveryBatch = Lists.newArrayListWithCapacity(maxBatchSize);
 
         if(LOG.isDebugEnabled()) {
-            LOG.debug("{} : starting log recovery batch with max size {}", persistenceId(), maxBatchSize);
+            LOG.debug("{}: starting log recovery batch with max size {}", persistenceId(), maxBatchSize);
         }
     }
 
@@ -668,40 +682,42 @@ public class Shard extends RaftActor {
             try {
                 currentLogRecoveryBatch.add(((ModificationPayload) data).getModification());
             } catch (ClassNotFoundException | IOException e) {
-                LOG.error(e, "Error extracting ModificationPayload");
+                LOG.error("{}: Error extracting ModificationPayload", persistenceId(), e);
             }
         } else if (data instanceof CompositeModificationPayload) {
             currentLogRecoveryBatch.add(((CompositeModificationPayload) data).getModification());
         } else if (data instanceof CompositeModificationByteStringPayload) {
             currentLogRecoveryBatch.add(((CompositeModificationByteStringPayload) data).getModification());
         } else {
-            LOG.error("Unknown state received {} during recovery", data);
+            LOG.error("{}: Unknown state received {} during recovery", persistenceId(), data);
         }
     }
 
     @Override
     protected void applyRecoverySnapshot(final byte[] snapshotBytes) {
         if(recoveryCoordinator == null) {
-            recoveryCoordinator = new ShardRecoveryCoordinator(persistenceId(), schemaContext);
+            recoveryCoordinator = new ShardRecoveryCoordinator(persistenceId(), schemaContext,
+                    LOG, name.toString());
         }
 
         recoveryCoordinator.submit(snapshotBytes, store.newWriteOnlyTransaction());
 
         if(LOG.isDebugEnabled()) {
-            LOG.debug("{} : submitted recovery sbapshot", persistenceId());
+            LOG.debug("{}: submitted recovery sbapshot", persistenceId());
         }
     }
 
     @Override
     protected void applyCurrentLogRecoveryBatch() {
         if(recoveryCoordinator == null) {
-            recoveryCoordinator = new ShardRecoveryCoordinator(persistenceId(), schemaContext);
+            recoveryCoordinator = new ShardRecoveryCoordinator(persistenceId(), schemaContext,
+                    LOG, name.toString());
         }
 
         recoveryCoordinator.submit(currentLogRecoveryBatch, store.newWriteOnlyTransaction());
 
         if(LOG.isDebugEnabled()) {
-            LOG.debug("{} : submitted log recovery batch with size {}", persistenceId(),
+            LOG.debug("{}: submitted log recovery batch with size {}", persistenceId(),
                     currentLogRecoveryBatch.size());
         }
     }
@@ -712,7 +728,7 @@ public class Shard extends RaftActor {
             Collection<DOMStoreWriteTransaction> txList = recoveryCoordinator.getTransactions();
 
             if(LOG.isDebugEnabled()) {
-                LOG.debug("{} : recovery complete - committing {} Tx's", persistenceId(), txList.size());
+                LOG.debug("{}: recovery complete - committing {} Tx's", persistenceId(), txList.size());
             }
 
             for(DOMStoreWriteTransaction tx: txList) {
@@ -721,7 +737,7 @@ public class Shard extends RaftActor {
                     shardMBean.incrementCommittedTransactionCount();
                 } catch (InterruptedException | ExecutionException e) {
                     shardMBean.incrementFailedTransactionsCount();
-                    LOG.error(e, "Failed to commit");
+                    LOG.error("{}: Failed to commit", persistenceId(), e);
                 }
             }
         }
@@ -751,7 +767,7 @@ public class Shard extends RaftActor {
             try {
                 applyModificationToState(clientActor, identifier, ((ModificationPayload) data).getModification());
             } catch (ClassNotFoundException | IOException e) {
-                LOG.error(e, "Error extracting ModificationPayload");
+                LOG.error("{}: Error extracting ModificationPayload", persistenceId(), e);
             }
         }
         else if (data instanceof CompositeModificationPayload) {
@@ -763,8 +779,8 @@ public class Shard extends RaftActor {
 
             applyModificationToState(clientActor, identifier, modification);
         } else {
-            LOG.error("Unknown state received {} Class loader = {} CompositeNodeMod.ClassLoader = {}",
-                    data, data.getClass().getClassLoader(),
+            LOG.error("{}: Unknown state received {} Class loader = {} CompositeNodeMod.ClassLoader = {}",
+                    persistenceId(), data, data.getClass().getClassLoader(),
                     CompositeModificationPayload.class.getClassLoader());
         }
 
@@ -775,8 +791,8 @@ public class Shard extends RaftActor {
     private void applyModificationToState(ActorRef clientActor, String identifier, Object modification) {
         if(modification == null) {
             LOG.error(
-                    "modification is null - this is very unexpected, clientActor = {}, identifier = {}",
-                    identifier, clientActor != null ? clientActor.path().toString() : null);
+                    "{}: modification is null - this is very unexpected, clientActor = {}, identifier = {}",
+                    persistenceId(), identifier, clientActor != null ? clientActor.path().toString() : null);
         } else if(clientActor == null) {
             // There's no clientActor to which to send a commit reply so we must be applying
             // replicated state from the leader.
@@ -821,7 +837,7 @@ public class Shard extends RaftActor {
         // we can safely commit everything in here. We not need to worry about event notifications
         // as they would have already been disabled on the follower
 
-        LOG.info("Applying snapshot");
+        LOG.info("{}: Applying snapshot", persistenceId());
         try {
             DOMStoreWriteTransaction transaction = store.newWriteOnlyTransaction();
 
@@ -834,9 +850,9 @@ public class Shard extends RaftActor {
             transaction.write(DATASTORE_ROOT, node);
             syncCommitTransaction(transaction);
         } catch (InterruptedException | ExecutionException e) {
-            LOG.error(e, "An exception occurred when applying snapshot");
+            LOG.error("{}: An exception occurred when applying snapshot", persistenceId(), e);
         } finally {
-            LOG.info("Done applying snapshot");
+            LOG.info("{}: Done applying snapshot", persistenceId());
         }
     }
 
@@ -865,8 +881,8 @@ public class Shard extends RaftActor {
             for(Map.Entry<String, DOMStoreTransactionChain> entry : transactionChains.entrySet()){
                 if(LOG.isDebugEnabled()) {
                     LOG.debug(
-                        "onStateChanged: Closing transaction chain {} because shard {} is no longer the leader",
-                        entry.getKey(), getId());
+                        "{}: onStateChanged: Closing transaction chain {} because shard {} is no longer the leader",
+                        persistenceId(), entry.getKey(), getId());
                 }
                 entry.getValue().close();
             }