| /** |
| * 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.metrics; |
| |
| import static java.net.HttpURLConnection.HTTP_NOT_FOUND; //404 |
| import static java.net.HttpURLConnection.HTTP_BAD_REQUEST; //400 |
| import static java.net.HttpURLConnection.HTTP_INTERNAL_ERROR; //500 |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| |
| import com.microsoft.azure.storage.OperationContext; |
| import com.microsoft.azure.storage.RequestResult; |
| import com.microsoft.azure.storage.ResponseReceivedEvent; |
| import com.microsoft.azure.storage.StorageEvent; |
| |
| |
| /** |
| * An event listener to the ResponseReceived event from Azure Storage that will |
| * update error metrics appropriately when it gets that event. |
| */ |
| @InterfaceAudience.Private |
| public final class ErrorMetricUpdater extends StorageEvent<ResponseReceivedEvent> { |
| private final AzureFileSystemInstrumentation instrumentation; |
| private final OperationContext operationContext; |
| |
| private ErrorMetricUpdater(OperationContext operationContext, |
| AzureFileSystemInstrumentation instrumentation) { |
| this.instrumentation = instrumentation; |
| this.operationContext = operationContext; |
| } |
| |
| /** |
| * Hooks a new listener to the given operationContext that will update the |
| * error metrics for the WASB file system appropriately in response to |
| * ResponseReceived events. |
| * |
| * @param operationContext The operationContext to hook. |
| * @param instrumentation The metrics source to update. |
| */ |
| public static void hook( |
| OperationContext operationContext, |
| AzureFileSystemInstrumentation instrumentation) { |
| ErrorMetricUpdater listener = |
| new ErrorMetricUpdater(operationContext, |
| instrumentation); |
| operationContext.getResponseReceivedEventHandler().addListener(listener); |
| } |
| |
| @Override |
| public void eventOccurred(ResponseReceivedEvent eventArg) { |
| RequestResult currentResult = operationContext.getLastResult(); |
| int statusCode = currentResult.getStatusCode(); |
| // Check if it's a client-side error: a 4xx status |
| // We exclude 404 because it happens frequently during the normal |
| // course of operation (each call to exists() would generate that |
| // if it's not found). |
| if (statusCode >= HTTP_BAD_REQUEST && statusCode < HTTP_INTERNAL_ERROR |
| && statusCode != HTTP_NOT_FOUND) { |
| instrumentation.clientErrorEncountered(); |
| } else if (statusCode >= HTTP_INTERNAL_ERROR) { |
| // It's a server error: a 5xx status. Could be an Azure Storage |
| // bug or (more likely) throttling. |
| instrumentation.serverErrorEncountered(); |
| } |
| } |
| } |