HADOOP-11960. Enable Azure-Storage Client Side logging. Contributed by Dushyanth.

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -569,6 +569,9 @@ Release 2.8.0 - UNRELEASED
     HADOOP-11713. ViewFileSystem should support snapshot methods.
     (Rakesh R via cnauroth)
 
+    HADOOP-11960. Enable Azure-Storage Client Side logging.
+    (Dushyanth via cnauroth)
+
   OPTIMIZATIONS
 
     HADOOP-11785. Reduce the number of listStatus operation in distcp

hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/AzureNativeFileSystemStore.java

@@ -148,6 +148,8 @@ public class AzureNativeFileSystemStore implements NativeFileSystemStore {
   private static final String KEY_SELF_THROTTLE_READ_FACTOR = "fs.azure.selfthrottling.read.factor";
   private static final String KEY_SELF_THROTTLE_WRITE_FACTOR = "fs.azure.selfthrottling.write.factor";
 
+  private static final String KEY_ENABLE_STORAGE_CLIENT_LOGGING = "fs.azure.storage.client.logging";
+
   private static final String PERMISSION_METADATA_KEY = "hdi_permission";
   private static final String OLD_PERMISSION_METADATA_KEY = "asv_permission";
   private static final String IS_FOLDER_METADATA_KEY = "hdi_isfolder";
@@ -681,6 +683,9 @@ private void configureAzureStorageSession() throws AzureException {
     selfThrottlingWriteFactor = sessionConfiguration.getFloat(
         KEY_SELF_THROTTLE_WRITE_FACTOR, DEFAULT_SELF_THROTTLE_WRITE_FACTOR);
 
+    OperationContext.setLoggingEnabledByDefault(sessionConfiguration.
+        getBoolean(KEY_ENABLE_STORAGE_CLIENT_LOGGING, false));
+
     if (LOG.isDebugEnabled()) {
       LOG.debug(String
           .format(

hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azure/TestNativeAzureFileSystemClientLogging.java

@@ -0,0 +1,130 @@
+/**
+ * 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.hadoop.fs.azure;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.net.URI;
+import java.util.StringTokenizer;
+
+import org.apache.commons.logging.impl.Log4JLogger;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.test.GenericTestUtils.LogCapturer;
+import org.apache.log4j.Logger;
+import org.junit.Test;
+
+/**
+ * Test to validate Azure storage client side logging. Tests works only when
+ * testing with Live Azure storage because Emulator does not have support for
+ * client-side logging.
+ *
+ */
+public class TestNativeAzureFileSystemClientLogging extends
+    NativeAzureFileSystemBaseTest {
+
+  private AzureBlobStorageTestAccount testAccount;
+
+  // Core-site config controlling Azure Storage Client logging
+  private static final String KEY_LOGGING_CONF_STRING = "fs.azure.storage.client.logging";
+
+  // Temporary directory created using WASB.
+  private static final String TEMP_DIR = "tempDir";
+
+  /*
+   * Helper method to verify the client logging is working. This check primarily
+   * checks to make sure we see a line in the logs corresponding to the entity
+   * that is created during test run.
+   */
+  private boolean verifyStorageClientLogs(String capturedLogs, String entity)
+      throws Exception {
+
+    URI uri = testAccount.getRealAccount().getBlobEndpoint();
+    String container = testAccount.getRealContainer().getName();
+    String validateString = uri + Path.SEPARATOR + container + Path.SEPARATOR
+        + entity;
+    boolean entityFound = false;
+
+    StringTokenizer tokenizer = new StringTokenizer(capturedLogs, "\n");
+
+    while (tokenizer.hasMoreTokens()) {
+      String token = tokenizer.nextToken();
+      if (token.contains(validateString)) {
+        entityFound = true;
+        break;
+      }
+    }
+    return entityFound;
+  }
+
+  /*
+   * Helper method that updates the core-site config to enable/disable logging.
+   */
+  private void updateFileSystemConfiguration(Boolean loggingFlag)
+      throws Exception {
+
+    Configuration conf = fs.getConf();
+    conf.set(KEY_LOGGING_CONF_STRING, loggingFlag.toString());
+    URI uri = fs.getUri();
+    fs.initialize(uri, conf);
+  }
+
+  // Using WASB code to communicate with Azure Storage.
+  private void performWASBOperations() throws Exception {
+
+    Path tempDir = new Path(Path.SEPARATOR + TEMP_DIR);
+    fs.mkdirs(tempDir);
+    fs.delete(tempDir, true);
+  }
+
+  @Test
+  public void testLoggingEnabled() throws Exception {
+
+    LogCapturer logs = LogCapturer.captureLogs(new Log4JLogger(Logger
+        .getRootLogger()));
+
+    // Update configuration based on the Test.
+    updateFileSystemConfiguration(true);
+
+    performWASBOperations();
+
+    assertTrue(verifyStorageClientLogs(logs.getOutput(), TEMP_DIR));
+  }
+
+  @Test
+  public void testLoggingDisabled() throws Exception {
+
+    LogCapturer logs = LogCapturer.captureLogs(new Log4JLogger(Logger
+        .getRootLogger()));
+
+    // Update configuration based on the Test.
+    updateFileSystemConfiguration(false);
+
+    performWASBOperations();
+
+    assertFalse(verifyStorageClientLogs(logs.getOutput(), TEMP_DIR));
+  }
+
+  @Override
+  protected AzureBlobStorageTestAccount createTestAccount() throws Exception {
+    testAccount = AzureBlobStorageTestAccount.create();
+    return testAccount;
+  }
+}