| /** |
| * 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 |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * 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.aliyun.oss; |
| |
| import org.apache.hadoop.io.IOUtils; |
| import org.apache.hadoop.io.retry.RetryPolicies; |
| import org.apache.hadoop.io.retry.RetryPolicy; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Used by {@link AliyunOSSInputStream} as an task that submitted |
| * to the thread pool. |
| * Each AliyunOSSFileReaderTask reads one part of the file so that |
| * we can accelerate the sequential read. |
| */ |
| public class AliyunOSSFileReaderTask implements Runnable { |
| public static final Logger LOG = |
| LoggerFactory.getLogger(AliyunOSSFileReaderTask.class); |
| |
| private String key; |
| private AliyunOSSFileSystemStore store; |
| private ReadBuffer readBuffer; |
| private static final int MAX_RETRIES = 3; |
| private RetryPolicy retryPolicy; |
| |
| public AliyunOSSFileReaderTask(String key, AliyunOSSFileSystemStore store, |
| ReadBuffer readBuffer) { |
| this.key = key; |
| this.store = store; |
| this.readBuffer = readBuffer; |
| RetryPolicy defaultPolicy = |
| RetryPolicies.retryUpToMaximumCountWithFixedSleep( |
| MAX_RETRIES, 3, TimeUnit.SECONDS); |
| Map<Class<? extends Exception>, RetryPolicy> policies = new HashMap<>(); |
| policies.put(IOException.class, defaultPolicy); |
| policies.put(IndexOutOfBoundsException.class, |
| RetryPolicies.TRY_ONCE_THEN_FAIL); |
| policies.put(NullPointerException.class, |
| RetryPolicies.TRY_ONCE_THEN_FAIL); |
| |
| this.retryPolicy = RetryPolicies.retryByException(defaultPolicy, policies); |
| } |
| |
| @Override |
| public void run() { |
| int retries = 0; |
| readBuffer.lock(); |
| try { |
| while (true) { |
| try (InputStream in = store.retrieve( |
| key, readBuffer.getByteStart(), readBuffer.getByteEnd())) { |
| IOUtils.readFully(in, readBuffer.getBuffer(), |
| 0, readBuffer.getBuffer().length); |
| readBuffer.setStatus(ReadBuffer.STATUS.SUCCESS); |
| break; |
| } catch (Exception e) { |
| LOG.warn("Exception thrown when retrieve key: " |
| + this.key + ", exception: " + e); |
| try { |
| RetryPolicy.RetryAction rc = retryPolicy.shouldRetry( |
| e, retries++, 0, true); |
| if (rc.action == RetryPolicy.RetryAction.RetryDecision.RETRY) { |
| Thread.sleep(rc.delayMillis); |
| } else { |
| //should not retry |
| break; |
| } |
| } catch (Exception ex) { |
| //FAIL |
| LOG.warn("Exception thrown when call shouldRetry, exception " + ex); |
| break; |
| } |
| } |
| } |
| |
| if (readBuffer.getStatus() != ReadBuffer.STATUS.SUCCESS) { |
| readBuffer.setStatus(ReadBuffer.STATUS.ERROR); |
| } |
| |
| //notify main thread which wait for this buffer |
| readBuffer.signalAll(); |
| } finally { |
| readBuffer.unlock(); |
| } |
| } |
| } |