/*
* 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.chukwa.dataloader;
import java.io.IOException;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.chukwa.conf.ChukwaConfiguration;
import org.apache.hadoop.chukwa.util.ExceptionUtil;
public class MetricDataLoaderPool extends DataLoaderFactory {
private static Log log = LogFactory.getLog(MetricDataLoaderPool.class);
protected MetricDataLoader threads[] = null;
private static String DATA_LOADER_THREAD_LIMIT = "chukwa.data.loader.threads.limit";
private int size = 1;
private static CompletionService completion = null;
private static ExecutorService executor = null;
public MetricDataLoaderPool() {
}
public void load(ChukwaConfiguration conf, FileSystem fs, FileStatus[] fileList) throws IOException {
if(executor==null) {
try {
this.size = Integer.parseInt(conf.get(DATA_LOADER_THREAD_LIMIT));
} catch(Exception e) {
this.size = 1;
}
executor = Executors.newFixedThreadPool(size);
}
if(completion==null) {
completion = new ExecutorCompletionService(executor);
}
try {
for(int i=0;i<fileList.length;i++) {
String filename = fileList[i].getPath().toUri().toString();
log.info("Processing: "+filename);
completion.submit(new MetricDataLoader(conf, fs, filename));
}
for(int i=0;i<fileList.length;i++) {
completion.take().get();
}
} catch(Exception e) {
log.error(ExceptionUtil.getStackTrace(e));
throw new IOException();
} finally {
}
}
public void shutdown() throws InterruptedException {
executor.shutdown();
executor.awaitTermination(30, TimeUnit.SECONDS);
executor.shutdownNow();
}
}