/**
* 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.blur.mapreduce.lib;
import java.io.IOException;
import org.apache.blur.thrift.generated.TableDescriptor;
import org.apache.blur.utils.BlurUtil;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
public class CheckOutputSpecs {
public static void checkOutputSpecs(Configuration config, int reducers) throws IOException, InterruptedException {
TableDescriptor tableDescriptor = BlurOutputFormat.getTableDescriptor(config);
if (tableDescriptor == null) {
throw new IOException("setTableDescriptor needs to be called first.");
}
Path outputPath = BlurOutputFormat.getOutputPath(config);
if (outputPath == null) {
throw new IOException("Output path is not set.");
}
BlurUtil.validateWritableDirectory(outputPath.getFileSystem(config), outputPath);
int shardCount = tableDescriptor.getShardCount();
int reducerMultiplier = BlurOutputFormat.getReducerMultiplier(config);
int validNumberOfReducers = reducerMultiplier * shardCount;
if (reducers > 0 && reducers != validNumberOfReducers) {
throw new IllegalArgumentException("Invalid number of reducers [ " + reducers + " ]."
+ " Number of Reducers should be [ " + validNumberOfReducers + " ].");
}
}
}