diff --git a/application/src/main/data/upgrade/3.5/schema_update.sql b/application/src/main/data/upgrade/3.4.3/schema_update.sql
similarity index 100%
rename from application/src/main/data/upgrade/3.5/schema_update.sql
rename to application/src/main/data/upgrade/3.4.3/schema_update.sql
diff --git a/application/src/main/java/org/thingsboard/server/controller/AlarmCommentController.java b/application/src/main/java/org/thingsboard/server/controller/AlarmCommentController.java
index 1541b40955..db8853122b 100644
--- a/application/src/main/java/org/thingsboard/server/controller/AlarmCommentController.java
+++ b/application/src/main/java/org/thingsboard/server/controller/AlarmCommentController.java
@@ -118,6 +118,6 @@ public class AlarmCommentController extends BaseController {
         Alarm alarm = checkAlarmId(alarmId, Operation.WRITE);
 
         PageLink pageLink = createPageLink(pageSize, page, null, sortProperty, sortOrder);
-        return checkNotNull(alarmCommentService.findAlarmComments(alarm.getTenantId(), alarmId, pageLink).get());
+        return checkNotNull(alarmCommentService.findAlarmComments(alarm.getTenantId(), alarmId, pageLink));
     }
 }
diff --git a/application/src/main/java/org/thingsboard/server/service/entitiy/TbNotificationEntityService.java b/application/src/main/java/org/thingsboard/server/service/entitiy/TbNotificationEntityService.java
index 744fa9ddaa..6ef53fd7f6 100644
--- a/application/src/main/java/org/thingsboard/server/service/entitiy/TbNotificationEntityService.java
+++ b/application/src/main/java/org/thingsboard/server/service/entitiy/TbNotificationEntityService.java
@@ -106,6 +106,7 @@ public interface TbNotificationEntityService {
     void notifyCreateOrUpdateAlarmComment(Alarm alarm, AlarmComment alarmComment, ActionType actionType, User user);
 
     void notifyDeleteAlarmComment(Alarm alarm,  AlarmComment alarmComment, User user);
+
     <E extends HasName, I extends EntityId> void notifyCreateOrUpdateOrDelete(TenantId tenantId, CustomerId customerId,
                                                                               I entityId, E entity, User user,
                                                                               ActionType actionType, boolean sendNotifyMsgToEdge,
diff --git a/application/src/main/java/org/thingsboard/server/service/entitiy/alarm/DefaultTbAlarmCommentService.java b/application/src/main/java/org/thingsboard/server/service/entitiy/alarm/DefaultTbAlarmCommentService.java
index 5359f02b17..5904745088 100644
--- a/application/src/main/java/org/thingsboard/server/service/entitiy/alarm/DefaultTbAlarmCommentService.java
+++ b/application/src/main/java/org/thingsboard/server/service/entitiy/alarm/DefaultTbAlarmCommentService.java
@@ -43,6 +43,7 @@ public class DefaultTbAlarmCommentService extends AbstractTbEntityService implem
             throw e;
         }
     }
+
     @Override
     public Boolean deleteAlarmComment(Alarm alarm, AlarmComment alarmComment, User user) {
         notificationEntityService.notifyDeleteAlarmComment(alarm, alarmComment, user);
diff --git a/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmCommentOperationResult.java b/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmCommentOperationResult.java
index 3687a03eca..3dc25e02ab 100644
--- a/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmCommentOperationResult.java
+++ b/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmCommentOperationResult.java
@@ -24,7 +24,6 @@ public class AlarmCommentOperationResult {
     private final boolean successful;
     private final boolean created;
 
-
     public AlarmCommentOperationResult(AlarmComment alarmComment, boolean successful) {
         this(alarmComment, successful, false);
     }
diff --git a/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmCommentService.java b/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmCommentService.java
index 3e92871b85..04eac2cc15 100644
--- a/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmCommentService.java
+++ b/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmCommentService.java
@@ -29,7 +29,7 @@ public interface AlarmCommentService {
 
     AlarmCommentOperationResult deleteAlarmComment(TenantId tenantId, AlarmCommentId alarmCommentId);
 
-    ListenableFuture<PageData<AlarmCommentInfo>> findAlarmComments(TenantId tenantId, AlarmId alarmId, PageLink pageLink);
+    PageData<AlarmCommentInfo>findAlarmComments(TenantId tenantId, AlarmId alarmId, PageLink pageLink);
 
     ListenableFuture<AlarmComment> findAlarmCommentByIdAsync(TenantId tenantId, AlarmCommentId alarmCommentId);
 
diff --git a/common/data/src/main/java/org/thingsboard/server/common/data/alarm/AlarmComment.java b/common/data/src/main/java/org/thingsboard/server/common/data/alarm/AlarmComment.java
index 2e3d4eb459..05aecdc7f0 100644
--- a/common/data/src/main/java/org/thingsboard/server/common/data/alarm/AlarmComment.java
+++ b/common/data/src/main/java/org/thingsboard/server/common/data/alarm/AlarmComment.java
@@ -33,13 +33,13 @@ import org.thingsboard.server.common.data.id.UserId;
 @Builder
 @AllArgsConstructor
 public class AlarmComment extends BaseData<AlarmCommentId> implements HasName {
-    @ApiModelProperty(position = 2, value = "JSON object with Alarm id.", accessMode = ApiModelProperty.AccessMode.READ_ONLY)
+    @ApiModelProperty(position = 3, value = "JSON object with Alarm id.", accessMode = ApiModelProperty.AccessMode.READ_ONLY)
     private EntityId alarmId;
-    @ApiModelProperty(position = 3, value = "JSON object with User id.", accessMode = ApiModelProperty.AccessMode.READ_ONLY)
+    @ApiModelProperty(position = 4, value = "JSON object with User id.", accessMode = ApiModelProperty.AccessMode.READ_ONLY)
     private UserId userId;
-    @ApiModelProperty(position = 4, value = "Defines origination of comment", example = "System/Other", accessMode = ApiModelProperty.AccessMode.READ_ONLY)
+    @ApiModelProperty(position = 5, value = "Defines origination of comment", example = "System/Other", accessMode = ApiModelProperty.AccessMode.READ_ONLY)
     private String type;
-    @ApiModelProperty(position = 5, value = "JSON object with text of comment.", dataType = "com.fasterxml.jackson.databind.JsonNode")
+    @ApiModelProperty(position = 6, value = "JSON object with text of comment.", dataType = "com.fasterxml.jackson.databind.JsonNode")
     private transient JsonNode comment;
 
     @ApiModelProperty(position = 1, value = "JSON object with the alarm comment Id. " +
diff --git a/dao/src/main/java/org/thingsboard/server/dao/alarm/BaseAlarmCommentService.java b/dao/src/main/java/org/thingsboard/server/dao/alarm/BaseAlarmCommentService.java
index f55a3564d9..33258f58cd 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/alarm/BaseAlarmCommentService.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/alarm/BaseAlarmCommentService.java
@@ -72,9 +72,8 @@ public class BaseAlarmCommentService extends AbstractEntityService implements Al
     }
 
     @Override
-    public ListenableFuture<PageData<AlarmCommentInfo>> findAlarmComments(TenantId tenantId, AlarmId alarmId, PageLink pageLink) {
-        PageData<AlarmCommentInfo> alarmComments = alarmCommentDao.findAlarmComments(tenantId, alarmId, pageLink);
-        return fetchAlarmCommentUserNames(tenantId, alarmComments);
+    public PageData<AlarmCommentInfo> findAlarmComments(TenantId tenantId, AlarmId alarmId, PageLink pageLink) {
+        return alarmCommentDao.findAlarmComments(tenantId, alarmId, pageLink);
     }
 
     private ListenableFuture<PageData<AlarmCommentInfo>> fetchAlarmCommentUserNames(TenantId tenantId, PageData<AlarmCommentInfo> alarmComments) {
diff --git a/dao/src/main/java/org/thingsboard/server/dao/model/sql/AlarmCommentInfoEntity.java b/dao/src/main/java/org/thingsboard/server/dao/model/sql/AlarmCommentInfoEntity.java
index 3d5dde1fd6..3bcb49f260 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/model/sql/AlarmCommentInfoEntity.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/model/sql/AlarmCommentInfoEntity.java
@@ -19,6 +19,9 @@ import lombok.Data;
 import lombok.EqualsAndHashCode;
 import org.thingsboard.server.common.data.alarm.AlarmCommentInfo;
 
+import java.util.HashMap;
+import java.util.Map;
+
 @Data
 @EqualsAndHashCode(callSuper = true)
 public class AlarmCommentInfoEntity extends AbstractAlarmCommentEntity<AlarmCommentInfo> {
@@ -34,6 +37,12 @@ public class AlarmCommentInfoEntity extends AbstractAlarmCommentEntity<AlarmComm
         super(alarmCommentEntity);
     }
 
+    public AlarmCommentInfoEntity(AlarmCommentEntity alarmCommentEntity, String firstName, String lastName) {
+        super(alarmCommentEntity);
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
     @Override
     public AlarmCommentInfo toData() {
         return new AlarmCommentInfo(super.toAlarmComment(), this.firstName, this.lastName);
diff --git a/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/AlarmCommentRepository.java b/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/AlarmCommentRepository.java
index be97cb1ee3..489928e1f7 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/AlarmCommentRepository.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/AlarmCommentRepository.java
@@ -27,7 +27,8 @@ import java.util.UUID;
 
 public interface AlarmCommentRepository extends JpaRepository<AlarmCommentEntity, UUID> {
 
-    @Query(value = "SELECT new org.thingsboard.server.dao.model.sql.AlarmCommentInfoEntity(a) FROM AlarmCommentEntity a " +
+    @Query(value = "SELECT new org.thingsboard.server.dao.model.sql.AlarmCommentInfoEntity(a, u.firstName, u.lastName) FROM AlarmCommentEntity a " +
+            "LEFT JOIN UserEntity u on u.id = a.userId " +
             "WHERE a.alarmId = :alarmId ",
             countQuery = "" +
                     "SELECT count(a) " +
diff --git a/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/JpaAlarmCommentDao.java b/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/JpaAlarmCommentDao.java
index 39524b565f..8b8b845b2e 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/JpaAlarmCommentDao.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/JpaAlarmCommentDao.java
@@ -55,7 +55,7 @@ public class JpaAlarmCommentDao extends JpaAbstractDao<AlarmCommentEntity, Alarm
 
     @Override
     public AlarmComment createAlarmComment(TenantId tenantId, AlarmComment alarmComment){
-        log.debug("Saving entity {}", alarmComment);
+        log.trace("Saving entity {}", alarmComment);
         partitioningRepository.createPartitionIfNotExists(ALARM_COMMENT_COLUMN_FAMILY_NAME, alarmComment.getCreatedTime(), TimeUnit.HOURS.toMillis(partitionSizeInHours));
         AlarmCommentEntity saved = alarmCommentRepository.save(new AlarmCommentEntity(alarmComment));
         return DaoUtil.getData(saved);
@@ -74,7 +74,7 @@ public class JpaAlarmCommentDao extends JpaAbstractDao<AlarmCommentEntity, Alarm
                 alarmCommentRepository.findAllByAlarmId(id.getId(), DaoUtil.toPageable(pageLink)));
     }
 
-
+    @Override
     public AlarmComment findAlarmCommentById(TenantId tenantId, UUID key) {
         return DaoUtil.getData(alarmCommentRepository.findById(key));
     }
diff --git a/dao/src/test/java/org/thingsboard/server/dao/service/BaseAlarmCommentServiceTest.java b/dao/src/test/java/org/thingsboard/server/dao/service/BaseAlarmCommentServiceTest.java
index e879910515..ccdbd08e98 100644
--- a/dao/src/test/java/org/thingsboard/server/dao/service/BaseAlarmCommentServiceTest.java
+++ b/dao/src/test/java/org/thingsboard/server/dao/service/BaseAlarmCommentServiceTest.java
@@ -95,7 +95,7 @@ public abstract class BaseAlarmCommentServiceTest extends AbstractServiceTest {
         AlarmComment fetched = alarmCommentService.findAlarmCommentByIdAsync(tenantId, createdComment.getId()).get();
         Assert.assertEquals(createdComment, fetched);
 
-        PageData<AlarmCommentInfo> alarmComments = alarmCommentService.findAlarmComments(tenantId, alarm.getId(), new PageLink(10, 0)).get();
+        PageData<AlarmCommentInfo> alarmComments = alarmCommentService.findAlarmComments(tenantId, alarm.getId(), new PageLink(10, 0));
         Assert.assertNotNull(alarmComments.getData());
         Assert.assertEquals(1, alarmComments.getData().size());
         Assert.assertEquals(createdComment, alarmComments.getData().get(0));
@@ -131,7 +131,7 @@ public abstract class BaseAlarmCommentServiceTest extends AbstractServiceTest {
         AlarmComment fetched = alarmCommentService.findAlarmCommentByIdAsync(tenantId, createdComment.getId()).get();
         Assert.assertEquals(updatedComment, fetched);
 
-        PageData<AlarmCommentInfo> alarmComments = alarmCommentService.findAlarmComments(tenantId, alarm.getId(), new PageLink(10, 0)).get();
+        PageData<AlarmCommentInfo> alarmComments = alarmCommentService.findAlarmComments(tenantId, alarm.getId(), new PageLink(10, 0));
         Assert.assertNotNull(alarmComments.getData());
         Assert.assertEquals(1, alarmComments.getData().size());
         Assert.assertEquals(new AlarmCommentInfo(updatedComment), alarmComments.getData().get(0));