| /** |
| * 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.hdfs.tools.offlineEditsViewer; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.hdfs.tools.offlineEditsViewer.OfflineEditsViewer; |
| import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp; |
| |
| import org.apache.hadoop.hdfs.server.namenode.EditLogInputStream; |
| import org.apache.hadoop.io.IOUtils; |
| |
| /** |
| * OfflineEditsBinaryLoader loads edits from a binary edits file |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| class OfflineEditsBinaryLoader implements OfflineEditsLoader { |
| private final OfflineEditsVisitor visitor; |
| private final EditLogInputStream inputStream; |
| private final boolean fixTxIds; |
| private final boolean recoveryMode; |
| private long nextTxId; |
| public static final Log LOG = |
| LogFactory.getLog(OfflineEditsBinaryLoader.class.getName()); |
| |
| /** |
| * Constructor |
| */ |
| public OfflineEditsBinaryLoader(OfflineEditsVisitor visitor, |
| EditLogInputStream inputStream, OfflineEditsViewer.Flags flags) { |
| this.visitor = visitor; |
| this.inputStream = inputStream; |
| this.fixTxIds = flags.getFixTxIds(); |
| this.recoveryMode = flags.getRecoveryMode(); |
| this.nextTxId = -1; |
| } |
| |
| /** |
| * Loads edits file, uses visitor to process all elements |
| */ |
| @Override |
| public void loadEdits() throws IOException { |
| try { |
| visitor.start(inputStream.getVersion(true)); |
| while (true) { |
| try { |
| FSEditLogOp op = inputStream.readOp(); |
| if (op == null) |
| break; |
| if (fixTxIds) { |
| if (nextTxId <= 0) { |
| nextTxId = op.getTransactionId(); |
| if (nextTxId <= 0) { |
| nextTxId = 1; |
| } |
| } |
| op.setTransactionId(nextTxId); |
| nextTxId++; |
| } |
| visitor.visitOp(op); |
| } catch (IOException e) { |
| if (!recoveryMode) { |
| // Tell the visitor to clean up, then re-throw the exception |
| LOG.error("Got IOException at position " + |
| inputStream.getPosition()); |
| visitor.close(e); |
| throw e; |
| } |
| LOG.error("Got IOException while reading stream! Resyncing.", e); |
| inputStream.resync(); |
| } catch (RuntimeException e) { |
| if (!recoveryMode) { |
| // Tell the visitor to clean up, then re-throw the exception |
| LOG.error("Got RuntimeException at position " + |
| inputStream.getPosition()); |
| visitor.close(e); |
| throw e; |
| } |
| LOG.error("Got RuntimeException while reading stream! Resyncing.", e); |
| inputStream.resync(); |
| } |
| } |
| visitor.close(null); |
| } finally { |
| IOUtils.cleanup(LOG, inputStream); |
| } |
| } |
| } |