/**
* 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.tajo.engine.planner.physical;
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.fs.Path;
import org.apache.tajo.catalog.statistics.StatisticsUtil;
import org.apache.tajo.catalog.statistics.TableStats;
import org.apache.tajo.datum.Datum;
import org.apache.tajo.engine.planner.logical.StoreTableNode;
import org.apache.tajo.storage.Appender;
import org.apache.tajo.storage.StorageManagerFactory;
import org.apache.tajo.storage.Tuple;
import org.apache.tajo.worker.TaskAttemptContext;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* This class is a physical operator to store at column partitioned table.
*/
public class HashBasedColPartitionStoreExec extends ColPartitionStoreExec {
private static Log LOG = LogFactory.getLog(HashBasedColPartitionStoreExec.class);
private final Map<String, Appender> appenderMap = new HashMap<String, Appender>();
public HashBasedColPartitionStoreExec(TaskAttemptContext context, StoreTableNode plan, PhysicalExec child)
throws IOException {
super(context, plan, child);
}
public void init() throws IOException {
super.init();
}
private Appender getAppender(String partition) throws IOException {
Appender appender = appenderMap.get(partition);
if (appender == null) {
Path dataFile = getDataFile(partition);
FileSystem fs = dataFile.getFileSystem(context.getConf());
if (fs.exists(dataFile.getParent())) {
LOG.info("Path " + dataFile.getParent() + " already exists!");
} else {
fs.mkdirs(dataFile.getParent());
LOG.info("Add subpartition path directory :" + dataFile.getParent());
}
if (fs.exists(dataFile)) {
LOG.info("File " + dataFile + " already exists!");
FileStatus status = fs.getFileStatus(dataFile);
LOG.info("File size: " + status.getLen());
}
appender = StorageManagerFactory.getStorageManager(context.getConf()).getAppender(meta, outSchema, dataFile);
appender.enableStats();
appender.init();
appenderMap.put(partition, appender);
} else {
appender = appenderMap.get(partition);
}
return appender;
}
/* (non-Javadoc)
* @see PhysicalExec#next()
*/
@Override
public Tuple next() throws IOException {
Tuple tuple;
StringBuilder sb = new StringBuilder();
while((tuple = child.next()) != null) {
// set subpartition directory name
sb.delete(0, sb.length());
if (keyIds != null) {
for(int i = 0; i < keyIds.length; i++) {
Datum datum = tuple.get(keyIds[i]);
if(i > 0)
sb.append("/");
sb.append(keyNames[i]).append("=");
sb.append(datum.asChars());
}
}
// add tuple
Appender appender = getAppender(sb.toString());
appender.addTuple(tuple);
}
List<TableStats> statSet = new ArrayList<TableStats>();
for (Map.Entry<String, Appender> entry : appenderMap.entrySet()) {
Appender app = entry.getValue();
app.flush();
app.close();
statSet.add(app.getStats());
}
// Collect and aggregated statistics data
TableStats aggregated = StatisticsUtil.aggregateTableStat(statSet);
context.setResultStats(aggregated);
return null;
}
@Override
public void rescan() throws IOException {
// nothing to do
}
}