| /** |
| * 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 java.io.OutputStream; |
| import java.io.OutputStreamWriter; |
| import java.io.PrintWriter; |
| import java.util.Map; |
| import java.util.HashMap; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp; |
| import org.apache.hadoop.hdfs.server.namenode.FSEditLogOpCodes; |
| |
| import com.google.common.base.Charsets; |
| |
| /** |
| * StatisticsEditsVisitor implements text version of EditsVisitor |
| * that aggregates counts of op codes processed |
| * |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public class StatisticsEditsVisitor implements OfflineEditsVisitor { |
| final private PrintWriter out; |
| |
| private int version = -1; |
| private final Map<FSEditLogOpCodes, Long> opCodeCount = |
| new HashMap<FSEditLogOpCodes, Long>(); |
| |
| /** |
| * Create a processor that writes to the file named and may or may not |
| * also output to the screen, as specified. |
| * |
| * @param filename Name of file to write output to |
| * @param tokenizer Input tokenizer |
| * @param printToScreen Mirror output to screen? |
| */ |
| public StatisticsEditsVisitor(OutputStream out) throws IOException { |
| this.out = new PrintWriter(new OutputStreamWriter(out, Charsets.UTF_8)); |
| } |
| |
| /** Start the visitor */ |
| @Override |
| public void start(int version) throws IOException { |
| this.version = version; |
| } |
| |
| /** Close the visitor */ |
| @Override |
| public void close(Throwable error) throws IOException { |
| out.print(getStatisticsString()); |
| if (error != null) { |
| out.print("EXITING ON ERROR: " + error.toString() + "\n"); |
| } |
| out.close(); |
| } |
| |
| @Override |
| public void visitOp(FSEditLogOp op) throws IOException { |
| incrementOpCodeCount(op.opCode); |
| } |
| |
| /** |
| * Increment the op code counter |
| * |
| * @param opCode opCode for which to increment count |
| */ |
| private void incrementOpCodeCount(FSEditLogOpCodes opCode) { |
| if(!opCodeCount.containsKey(opCode)) { |
| opCodeCount.put(opCode, 0L); |
| } |
| Long newValue = opCodeCount.get(opCode) + 1; |
| opCodeCount.put(opCode, newValue); |
| } |
| |
| /** |
| * Get statistics |
| * |
| * @return statistics, map of counts per opCode |
| */ |
| public Map<FSEditLogOpCodes, Long> getStatistics() { |
| return opCodeCount; |
| } |
| |
| /** |
| * Get the statistics in string format, suitable for printing |
| * |
| * @return statistics in in string format, suitable for printing |
| */ |
| public String getStatisticsString() { |
| StringBuffer sb = new StringBuffer(); |
| sb.append(String.format( |
| " %-30.30s : %d%n", |
| "VERSION", version)); |
| for(FSEditLogOpCodes opCode : FSEditLogOpCodes.values()) { |
| sb.append(String.format( |
| " %-30.30s (%3d): %d%n", |
| opCode.toString(), |
| opCode.getOpCode(), |
| opCodeCount.get(opCode))); |
| } |
| return sb.toString(); |
| } |
| } |