diff --git a/fe/fe-core/src/main/java/org/apache/doris/qe/SimpleScheduler.java b/fe/fe-core/src/main/java/org/apache/doris/qe/SimpleScheduler.java
index 0cafcae58c..cb8a4ecc34 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/qe/SimpleScheduler.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/qe/SimpleScheduler.java
@@ -178,7 +178,8 @@ public class SimpleScheduler {
         }
 
         blacklistBackends.put(backendID, Pair.of(Config.blacklist_duration_second + 1, reason));
-        LOG.warn("add backend {} to black list. reason: {}", backendID, reason);
+        // Should print the exception stack, so that we will know when it is added to blacklist.
+        LOG.warn("add backend {} to black list. reason: {}", backendID, reason, new Exception());
     }
 
     public static boolean isAvailable(Backend backend) {
diff --git a/fe/fe-core/src/main/java/org/apache/doris/system/BeSelectionPolicy.java b/fe/fe-core/src/main/java/org/apache/doris/system/BeSelectionPolicy.java
index f8e4429a16..dd70589f69 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/system/BeSelectionPolicy.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/system/BeSelectionPolicy.java
@@ -237,7 +237,8 @@ public class BeSelectionPolicy {
 
     @Override
     public String toString() {
-        return String.format("computeNode=%s | query=%s | load=%s | schedule=%s | tags=%s(%s) | medium=%s",
+        return String.format("computeNode=%s | query=%s | load=%s | schedule=%s | tags=%s |"
+                + "resource_downgrade=%s | medium=%s",
                 preferComputeNode, needQueryAvailable, needLoadAvailable, needScheduleAvailable,
                 resourceTags.stream().map(tag -> tag.toString()).collect(Collectors.joining(",")),
                 this.allowResourceTagDowngrade, storageMedium);
diff --git a/fe/fe-core/src/main/java/org/apache/doris/system/SystemInfoService.java b/fe/fe-core/src/main/java/org/apache/doris/system/SystemInfoService.java
index 0ca452992f..662455c87d 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/system/SystemInfoService.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/system/SystemInfoService.java
@@ -563,7 +563,7 @@ public class SystemInfoService {
         StringBuilder sb = new StringBuilder(" Backends details: ");
         for (Tag tag : replicaAlloc.getAllocMap().keySet()) {
             sb.append("backends with tag ").append(tag).append(" is ");
-            sb.append(idToBackendRef.values().stream().filter(be -> be.getLocationTag() == tag)
+            sb.append(idToBackendRef.values().stream().filter(be -> be.getLocationTag().equals(tag))
                     .map(Backend::getDetailsForCreateReplica)
                     .collect(Collectors.toList()));
             sb.append(", ");