Jackie-Jiang commented on code in PR #15436:
URL: https://github.com/apache/pinot/pull/15436#discussion_r2036270631


##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/rebalance/TableRebalanceLogger.java:
##########
@@ -0,0 +1,61 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pinot.controller.helix.core.rebalance;
+
+import org.slf4j.Logger;
+import org.slf4j.helpers.MessageFormatter;
+
+
+public class TableRebalanceLogger {
+  private final Logger _logger;
+  private final String _rebalanceJobId;
+
+  public TableRebalanceLogger(Logger baseLogger) {
+    _logger = baseLogger;
+    _rebalanceJobId = "";
+  }
+
+  public TableRebalanceLogger(Logger baseLogger, String rebalanceJobId) {

Review Comment:
   (nit) It is not really used as base logger
   ```suggestion
     public TableRebalanceLogger(Logger logger, String rebalanceJobId) {
   ```



##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/rebalance/TableRebalanceLogger.java:
##########
@@ -0,0 +1,61 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pinot.controller.helix.core.rebalance;
+
+import org.slf4j.Logger;
+import org.slf4j.helpers.MessageFormatter;
+
+
+public class TableRebalanceLogger {
+  private final Logger _logger;
+  private final String _rebalanceJobId;
+
+  public TableRebalanceLogger(Logger baseLogger) {

Review Comment:
   Do we every initiate this logger without an id? The log will be very strange 
without job id.



##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/rebalance/TableRebalanceLogger.java:
##########
@@ -0,0 +1,61 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pinot.controller.helix.core.rebalance;
+
+import org.slf4j.Logger;
+import org.slf4j.helpers.MessageFormatter;
+
+
+public class TableRebalanceLogger {
+  private final Logger _logger;
+  private final String _rebalanceJobId;
+
+  public TableRebalanceLogger(Logger baseLogger) {
+    _logger = baseLogger;
+    _rebalanceJobId = "";
+  }
+
+  public TableRebalanceLogger(Logger baseLogger, String rebalanceJobId) {
+    _logger = baseLogger;
+    _rebalanceJobId = rebalanceJobId;
+  }
+
+  private static String formatMessage(String message, String rebalanceJobId, 
Object... args) {
+    if (args.length == 0) {
+      return "[" + rebalanceJobId + "] " + message;
+    }
+    return "[" + rebalanceJobId + "] " + MessageFormatter.arrayFormat(message, 
args).getMessage();

Review Comment:
   We don't want to pre-format the message because it can add overhead when the 
log level is high (especially for debug info which is almost always skipped). 
Actually always passing `Object... args` is already adding unnecessary overhead.



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