org.apache.tez.log.analyzer.StuckTaskAnalyzer.java Source code

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Here is the source code for org.apache.tez.log.analyzer.StuckTaskAnalyzer.java

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/**
 * 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.tez.log.analyzer;

import com.google.common.base.Joiner;
import com.google.common.collect.Maps;
import org.apache.tez.log.IAnalyzer;

import java.io.IOException;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Print all tasks which have started but not finished
 */
public class StuckTaskAnalyzer extends BaseAnalyzer {
    private Map<String, String> startedTasks = Maps.newTreeMap();
    private Map<String, String> finishedTasks = Maps.newTreeMap();

    private static final String TASK_STARTED = "TASK_STARTED";
    private static final String TASK_FINISHED = "TASK_FINISHED";

    private static final Pattern startPattern = Pattern.compile("vertexName=(.*), taskId=(.*), scheduledTime=(.*)");
    private static final Pattern finishPattern = Pattern.compile("vertexName=(.*), taskId=(.*), startTime=(.*)");

    @Override
    public void process(String line) throws IOException {
        if (line.contains(TASK_STARTED)) {
            match(line, startPattern, startedTasks);
        } else if (line.contains(TASK_FINISHED)) {
            match(line, finishPattern, finishedTasks);
        }
    }

    private void match(String line, Pattern pattern, Map<String, String> map) {
        Matcher matcher = pattern.matcher(line);
        while (matcher.find()) {
            String vertexName = matcher.group(1).trim();
            String taskId = matcher.group(2).trim();
            map.put(taskId, vertexName);
        }
    }

    @Override
    public String getAnalysis() throws IOException {
        Map<String, String> diffMap = Maps.newLinkedHashMap();
        for (Map.Entry<String, String> entry : startedTasks.entrySet()) {
            if (finishedTasks.get(entry.getKey()) == null) {
                diffMap.put(entry.getKey(), entry.getValue());
            }
        }
        Joiner.MapJoiner joiner = Joiner.on('\n').withKeyValueSeparator("=");
        return joiner.join(diffMap);
    }

    @Override
    public String getName() {
        return "Stuck Task Analyzer (replace task by attempt & search in "
                + "Task Attempt Started to known node details)";
    }

    @Override
    public Object getResult() {
        return null;
    }
}