Jackie-Jiang commented on code in PR #9180:
URL: https://github.com/apache/pinot/pull/9180#discussion_r940762275


##########
pinot-common/src/test/java/org/apache/pinot/common/utils/LoggerUtilsTest.java:
##########
@@ -0,0 +1,84 @@
+/**
+ * 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.common.utils;
+
+import com.google.common.collect.ImmutableList;
+import java.util.List;
+import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+
+public class LoggerUtilsTest {
+  private static final Logger LOGGER = 
LoggerFactory.getLogger(LoggerUtilsTest.class);
+
+  @Test
+  public void testGetAllLoggers() {
+    List<String> allLoggers = LoggerUtils.getAllLoggers();
+    Assert.assertEquals(allLoggers.size(), 1);
+    Assert.assertEquals(allLoggers.get(0), "root");
+  }
+
+  @Test
+  public void testGetLoggerInfo() {
+    Map<String, Object> rootLoggerInfo = LoggerUtils.getLoggerInfo("root");
+    Assert.assertEquals(rootLoggerInfo.get("name"), "root");
+    Assert.assertEquals(rootLoggerInfo.get("level"), "WARN");
+    Assert.assertNull(rootLoggerInfo.get("filter"));
+
+    Assert.assertNull(LoggerUtils.getLoggerInfo("notExistLogger"));
+  }
+
+  @Test
+  public void testChangeLoggerLevel() {
+    Assert.assertEquals(LoggerUtils.getLoggerInfo("root").get("level"), 
"WARN");
+    for (String level : ImmutableList.of("WARN", "INFO", "DEBUG", "ERROR", 
"WARN")) {
+      LoggerUtils.setLoggerLevel("root", level);
+      System.out.println("Current logger level is " + level);

Review Comment:
   (minor) Remove the console output



##########
pinot-broker/src/main/java/org/apache/pinot/broker/api/resources/PinotBrokerLogger.java:
##########
@@ -0,0 +1,83 @@
+/**
+ * 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.broker.api.resources;
+
+import io.swagger.annotations.Api;
+import io.swagger.annotations.ApiKeyAuthDefinition;
+import io.swagger.annotations.ApiOperation;
+import io.swagger.annotations.ApiParam;
+import io.swagger.annotations.Authorization;
+import io.swagger.annotations.SecurityDefinition;
+import io.swagger.annotations.SwaggerDefinition;
+import java.util.List;
+import java.util.Map;
+import javax.ws.rs.GET;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.HttpHeaders;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import org.apache.pinot.common.utils.LoggerUtils;
+
+import static 
org.apache.pinot.spi.utils.CommonConstants.SWAGGER_AUTHORIZATION_KEY;
+
+
+/**
+ * Logger resource.
+ */
+@Api(tags = "Logger", authorizations = {@Authorization(value = 
SWAGGER_AUTHORIZATION_KEY)})
+@SwaggerDefinition(securityDefinition = 
@SecurityDefinition(apiKeyAuthDefinitions = @ApiKeyAuthDefinition(name =
+    HttpHeaders.AUTHORIZATION, in = 
ApiKeyAuthDefinition.ApiKeyLocation.HEADER, key = SWAGGER_AUTHORIZATION_KEY)))
+@Path("/loggers/")
+public class PinotBrokerLogger {
+
+  @GET
+  @Path("")
+  @Produces(MediaType.APPLICATION_JSON)
+  @ApiOperation(value = "Get all the loggers", notes = "Return all the logger 
names")
+  public List<String> getLoggers(
+      @ApiParam(value = "Name of the table", required = true) 
@PathParam("tableName") String tableNameWithType) {
+    return LoggerUtils.getAllLoggers();
+  }
+
+  @GET
+  @Path("{loggerName}")
+  @Produces(MediaType.APPLICATION_JSON)
+  @ApiOperation(value = "Get logger configs", notes = "Return logger info")
+  public Map<String, Object> getLogger(
+      @ApiParam(value = "Logger name", required = true) 
@PathParam("loggerName") String loggerName) {
+    Map<String, Object> loggerInfo = LoggerUtils.getLoggerInfo(loggerName);
+    if (loggerInfo == null) {
+      throw new WebApplicationException(String.format("Logger %s not found", 
loggerName), Response.Status.NOT_FOUND);
+    }
+    return loggerInfo;
+  }
+
+  @PUT
+  @Path("{loggerName}/level/{logLevel}")
+  @Produces(MediaType.APPLICATION_JSON)
+  @ApiOperation(value = "Set logger level", notes = "Set logger level for a 
given logger")
+  public Map<String, Object> setLoggerLevel(@ApiParam(value = "Logger name") 
@PathParam("loggerName") String loggerName,
+      @ApiParam(value = "Logger level") @PathParam("logLevel") String 
logLevel) {

Review Comment:
   Consider making level a query param



##########
pinot-common/src/main/java/org/apache/pinot/common/utils/LoggerUtils.java:
##########
@@ -0,0 +1,104 @@
+/**
+ * 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.common.utils;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import javax.annotation.Nullable;
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.config.Configuration;
+import org.apache.logging.log4j.core.config.LoggerConfig;
+
+
+/**
+ * Logger utils for process level logger management.
+ */
+public class LoggerUtils {
+  private static final String ROOT = "root";
+  private static final String NAME = "name";
+  private static final String LEVEL = "level";
+  private static final String FILTER = "filter";
+
+  private LoggerUtils() {
+  }
+
+  /**
+   * Set logger level at runtime.
+   * @param loggerName
+   * @param logLevel
+   * @return logger info
+   */
+  public static Map<String, Object> setLoggerLevel(String loggerName, String 
logLevel) {
+    LoggerContext context = (LoggerContext) LogManager.getContext(false);
+    Configuration config = context.getConfiguration();
+    if (!getAllLoggers().contains(loggerName)) {
+      throw new RuntimeException("Logger - " + loggerName + " not found");
+    }
+    LoggerConfig loggerConfig = getLoggerConfig(config, loggerName);
+    try {
+      loggerConfig.setLevel(Level.valueOf(logLevel));
+    } catch (Exception e) {
+      throw new RuntimeException("Unrecognized logger level - " + logLevel, e);
+    }
+    // This causes all Loggers to re-fetch information from their LoggerConfig.
+    context.updateLoggers();
+    return getLoggerResponse(loggerConfig);
+  }
+
+  /**
+   * Fetch logger info of name, level and filter.
+   * @param loggerName
+   * @return logger info
+   */
+  @Nullable
+  public static Map<String, Object> getLoggerInfo(String loggerName) {
+    LoggerContext context = (LoggerContext) LogManager.getContext(false);
+    Configuration config = context.getConfiguration();
+    if (!getAllLoggers().contains(loggerName)) {
+      return null;
+    }
+    LoggerConfig loggerConfig = getLoggerConfig(config, loggerName);
+    return getLoggerResponse(loggerConfig);
+  }
+
+  /**
+   * @return a list of all the logger names
+   */
+  public static List<String> getAllLoggers() {
+    LoggerContext context = (LoggerContext) LogManager.getContext(false);
+    Configuration config = context.getConfiguration();
+    return 
config.getLoggers().values().stream().map(LoggerConfig::toString).collect(Collectors.toList());

Review Comment:
   What is the key of the `config.getLoggers()`? For the root config, seems the 
key is empty string. What about other logger configs?
   
   Can it ever have duplicate values? If so, should we return a set instead?



##########
pinot-common/src/test/java/org/apache/pinot/common/utils/LoggerUtilsTest.java:
##########
@@ -0,0 +1,84 @@
+/**
+ * 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.common.utils;
+
+import com.google.common.collect.ImmutableList;
+import java.util.List;
+import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+
+public class LoggerUtilsTest {
+  private static final Logger LOGGER = 
LoggerFactory.getLogger(LoggerUtilsTest.class);
+
+  @Test
+  public void testGetAllLoggers() {
+    List<String> allLoggers = LoggerUtils.getAllLoggers();
+    Assert.assertEquals(allLoggers.size(), 1);
+    Assert.assertEquals(allLoggers.get(0), "root");
+  }
+
+  @Test
+  public void testGetLoggerInfo() {
+    Map<String, Object> rootLoggerInfo = LoggerUtils.getLoggerInfo("root");
+    Assert.assertEquals(rootLoggerInfo.get("name"), "root");
+    Assert.assertEquals(rootLoggerInfo.get("level"), "WARN");
+    Assert.assertNull(rootLoggerInfo.get("filter"));
+
+    Assert.assertNull(LoggerUtils.getLoggerInfo("notExistLogger"));
+  }
+
+  @Test
+  public void testChangeLoggerLevel() {
+    Assert.assertEquals(LoggerUtils.getLoggerInfo("root").get("level"), 
"WARN");
+    for (String level : ImmutableList.of("WARN", "INFO", "DEBUG", "ERROR", 
"WARN")) {
+      LoggerUtils.setLoggerLevel("root", level);
+      System.out.println("Current logger level is " + level);
+      loggerAllLevels();

Review Comment:
   We should verify whether the log has the certain level enabled, e.g. 
`assertTrue(LOGGER.isWarnEnabled())`



##########
pinot-broker/src/main/java/org/apache/pinot/broker/api/resources/PinotBrokerLogger.java:
##########
@@ -0,0 +1,83 @@
+/**
+ * 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.broker.api.resources;
+
+import io.swagger.annotations.Api;
+import io.swagger.annotations.ApiKeyAuthDefinition;
+import io.swagger.annotations.ApiOperation;
+import io.swagger.annotations.ApiParam;
+import io.swagger.annotations.Authorization;
+import io.swagger.annotations.SecurityDefinition;
+import io.swagger.annotations.SwaggerDefinition;
+import java.util.List;
+import java.util.Map;
+import javax.ws.rs.GET;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.HttpHeaders;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import org.apache.pinot.common.utils.LoggerUtils;
+
+import static 
org.apache.pinot.spi.utils.CommonConstants.SWAGGER_AUTHORIZATION_KEY;
+
+
+/**
+ * Logger resource.
+ */
+@Api(tags = "Logger", authorizations = {@Authorization(value = 
SWAGGER_AUTHORIZATION_KEY)})
+@SwaggerDefinition(securityDefinition = 
@SecurityDefinition(apiKeyAuthDefinitions = @ApiKeyAuthDefinition(name =
+    HttpHeaders.AUTHORIZATION, in = 
ApiKeyAuthDefinition.ApiKeyLocation.HEADER, key = SWAGGER_AUTHORIZATION_KEY)))
+@Path("/loggers/")
+public class PinotBrokerLogger {
+
+  @GET
+  @Path("")
+  @Produces(MediaType.APPLICATION_JSON)
+  @ApiOperation(value = "Get all the loggers", notes = "Return all the logger 
names")
+  public List<String> getLoggers(
+      @ApiParam(value = "Name of the table", required = true) 
@PathParam("tableName") String tableNameWithType) {

Review Comment:
   Why taking a table name?



##########
pinot-broker/src/main/java/org/apache/pinot/broker/api/resources/PinotBrokerLogger.java:
##########
@@ -0,0 +1,83 @@
+/**
+ * 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.broker.api.resources;
+
+import io.swagger.annotations.Api;
+import io.swagger.annotations.ApiKeyAuthDefinition;
+import io.swagger.annotations.ApiOperation;
+import io.swagger.annotations.ApiParam;
+import io.swagger.annotations.Authorization;
+import io.swagger.annotations.SecurityDefinition;
+import io.swagger.annotations.SwaggerDefinition;
+import java.util.List;
+import java.util.Map;
+import javax.ws.rs.GET;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.HttpHeaders;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import org.apache.pinot.common.utils.LoggerUtils;
+
+import static 
org.apache.pinot.spi.utils.CommonConstants.SWAGGER_AUTHORIZATION_KEY;
+
+
+/**
+ * Logger resource.
+ */
+@Api(tags = "Logger", authorizations = {@Authorization(value = 
SWAGGER_AUTHORIZATION_KEY)})
+@SwaggerDefinition(securityDefinition = 
@SecurityDefinition(apiKeyAuthDefinitions = @ApiKeyAuthDefinition(name =
+    HttpHeaders.AUTHORIZATION, in = 
ApiKeyAuthDefinition.ApiKeyLocation.HEADER, key = SWAGGER_AUTHORIZATION_KEY)))
+@Path("/loggers/")

Review Comment:
   (minor) Not sure if this works as expected. I remember running into some 
issues before, and we changed all of the root path as `"/"`



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