diff --git a/fe/src/main/java/org/apache/doris/alter/SchemaChangeJob.java b/fe/src/main/java/org/apache/doris/alter/SchemaChangeJob.java
index e11575b526..5dbdfd55c7 100644
--- a/fe/src/main/java/org/apache/doris/alter/SchemaChangeJob.java
+++ b/fe/src/main/java/org/apache/doris/alter/SchemaChangeJob.java
@@ -704,7 +704,9 @@ public class SchemaChangeJob extends AlterJob {
                                 }
 
                                 if (replica.getLastFailedVersion() > 0) {
-                                    -- healthNum;
+                                    LOG.warn("replica {} of tablet {} last failed version > 0, set it as bad",
+                                            replica, tablet.getId());
+                                    --healthNum;
                                     continue;
                                 }
                             }
diff --git a/fe/src/main/java/org/apache/doris/catalog/BrokerMgr.java b/fe/src/main/java/org/apache/doris/catalog/BrokerMgr.java
index 9f68c26d3e..8ef0e5d4dc 100644
--- a/fe/src/main/java/org/apache/doris/catalog/BrokerMgr.java
+++ b/fe/src/main/java/org/apache/doris/catalog/BrokerMgr.java
@@ -324,7 +324,7 @@ public class BrokerMgr {
                         row.add(String.valueOf(broker.isAlive));
                         row.add(TimeUtils.longToTimeString(broker.lastStartTime));
                         row.add(TimeUtils.longToTimeString(broker.lastUpdateTime));
-                        row.add(broker.msg);
+                        row.add(broker.heartbeatErrMsg);
                         result.addRow(row);
                     }
                 }
diff --git a/fe/src/main/java/org/apache/doris/catalog/FsBroker.java b/fe/src/main/java/org/apache/doris/catalog/FsBroker.java
index a8b00436ec..56f81d219c 100644
--- a/fe/src/main/java/org/apache/doris/catalog/FsBroker.java
+++ b/fe/src/main/java/org/apache/doris/catalog/FsBroker.java
@@ -30,7 +30,7 @@ public class FsBroker implements Writable, Comparable<FsBroker> {
     public String ip;
     public int port;
     // msg for ping result
-    public String msg;
+    public String heartbeatErrMsg = "";
     public long lastUpdateTime;
     public long lastStartTime = -1;
 
@@ -59,13 +59,13 @@ public class FsBroker implements Writable, Comparable<FsBroker> {
                 lastStartTime = hbResponse.getHbTime();
             }
             lastUpdateTime = hbResponse.getHbTime();
-            msg = "";
+            heartbeatErrMsg = "";
         } else {
             if (isAlive) {
                 isAlive = false;
                 isChanged = true;
             }
-            msg = hbResponse.getMsg();
+            heartbeatErrMsg = hbResponse.getMsg() == null ? "Unknown error" : hbResponse.getMsg();
         }
 
         return isChanged;
diff --git a/fe/src/main/java/org/apache/doris/catalog/Replica.java b/fe/src/main/java/org/apache/doris/catalog/Replica.java
index 2ef2233125..f65267f54f 100644
--- a/fe/src/main/java/org/apache/doris/catalog/Replica.java
+++ b/fe/src/main/java/org/apache/doris/catalog/Replica.java
@@ -349,7 +349,7 @@ public class Replica implements Writable {
     
     @Override
     public String toString() {
-        StringBuffer strBuffer = new StringBuffer("replicaId=");
+        StringBuffer strBuffer = new StringBuffer("[replicaId=");
         strBuffer.append(id);
         strBuffer.append(", BackendId=");
         strBuffer.append(backendId);
@@ -373,6 +373,7 @@ public class Replica implements Writable {
         strBuffer.append(lastFailedTimestamp);
         strBuffer.append(", schemaHash");
         strBuffer.append(schemaHash);
+        strBuffer.append("]");
         return strBuffer.toString();
     }
 
diff --git a/fe/src/main/java/org/apache/doris/common/Config.java b/fe/src/main/java/org/apache/doris/common/Config.java
index 6247bf1f1c..f2d05de68b 100644
--- a/fe/src/main/java/org/apache/doris/common/Config.java
+++ b/fe/src/main/java/org/apache/doris/common/Config.java
@@ -743,6 +743,6 @@ public class Config extends ConfigBase {
      * if set to true, TabletScheduler will not do balance.
      */
     @ConfField(mutable = true, masterOnly = true)
-    public static boolean disable_balance = false; // 10%
+    public static boolean disable_balance = false;
 }
 
diff --git a/fe/src/main/java/org/apache/doris/common/proc/FrontendsProcNode.java b/fe/src/main/java/org/apache/doris/common/proc/FrontendsProcNode.java
index 45bf349083..b2043427c2 100644
--- a/fe/src/main/java/org/apache/doris/common/proc/FrontendsProcNode.java
+++ b/fe/src/main/java/org/apache/doris/common/proc/FrontendsProcNode.java
@@ -108,7 +108,7 @@ public class FrontendsProcNode implements ProcNodeInterface {
             
             info.add(String.valueOf(isHelperNode(helperNodes, fe)));
 
-            info.add(fe.getMsg());
+            info.add(fe.getHeartbeatErrMsg());
 
             infos.add(info);
         }
diff --git a/fe/src/main/java/org/apache/doris/system/Backend.java b/fe/src/main/java/org/apache/doris/system/Backend.java
index c214183b38..901bf15439 100644
--- a/fe/src/main/java/org/apache/doris/system/Backend.java
+++ b/fe/src/main/java/org/apache/doris/system/Backend.java
@@ -566,7 +566,7 @@ public class Backend implements Writable {
                 LOG.info("{} is dead,", this.toString());
             }
 
-            heartbeatErrMsg = hbResponse.getMsg();
+            heartbeatErrMsg = hbResponse.getMsg() == null ? "Unknown error" : hbResponse.getMsg();
         }
 
         return isChanged;
diff --git a/fe/src/main/java/org/apache/doris/system/Frontend.java b/fe/src/main/java/org/apache/doris/system/Frontend.java
index d6ae74da8a..0a315c8ce4 100644
--- a/fe/src/main/java/org/apache/doris/system/Frontend.java
+++ b/fe/src/main/java/org/apache/doris/system/Frontend.java
@@ -40,7 +40,7 @@ public class Frontend implements Writable {
 
     private long replayedJournalId;
     private long lastUpdateTime;
-    private String msg = "";
+    private String heartbeatErrMsg = "";
 
     private boolean isAlive = false;
 
@@ -101,8 +101,8 @@ public class Frontend implements Writable {
         return replayedJournalId;
     }
 
-    public String getMsg() {
-        return msg;
+    public String getHeartbeatErrMsg() {
+        return heartbeatErrMsg;
     }
 
     public long getLastUpdateTime() {
@@ -123,14 +123,14 @@ public class Frontend implements Writable {
             rpcPort = hbResponse.getRpcPort();
             replayedJournalId = hbResponse.getReplayedJournalId();
             lastUpdateTime = hbResponse.getHbTime();
-            msg = "";
+            heartbeatErrMsg = "";
             isChanged = true;
         } else {
             if (isAlive) {
                 isAlive = false;
                 isChanged = true;
             }
-            msg = hbResponse.getMsg();
+            heartbeatErrMsg = hbResponse.getMsg() == null ? "Unknown error" : hbResponse.getMsg();
         }
         return isChanged;
     }