io.gzet.community.accumulo.AccumuloGraphxInputFormat.java Source code

Introduction

Here is the source code for io.gzet.community.accumulo.AccumuloGraphxInputFormat.java

Source

/*
 * Licensed 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 io.gzet.community.accumulo;

import org.apache.accumulo.core.client.mapreduce.InputFormatBase;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.util.format.DefaultFormatter;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

import java.io.IOException;
import java.util.Map.Entry;

public class AccumuloGraphxInputFormat extends InputFormatBase<NullWritable, EdgeWritable> {
    @Override
    public RecordReader<NullWritable, EdgeWritable> createRecordReader(InputSplit split, TaskAttemptContext context)
            throws IOException, InterruptedException {
        log.setLevel(getLogLevel(context));
        return new RecordReaderBase<NullWritable, EdgeWritable>() {
            @Override
            public boolean nextKeyValue() throws IOException, InterruptedException {
                if (scannerIterator.hasNext()) {
                    ++numKeysRead;

                    Entry<Key, Value> entry = scannerIterator.next();
                    EdgeWritable edge = new EdgeWritable();
                    edge.setSourceVertex(entry.getKey().getRow().toString());
                    edge.setDestVertex(entry.getKey().getColumnQualifier().toString());
                    edge.setCount(Long.parseLong(entry.getValue().toString()));

                    currentK = NullWritable.get();
                    currentKey = entry.getKey();
                    currentV = edge;
                    if (log.isTraceEnabled())
                        log.trace("Processing key/value pair: " + DefaultFormatter.formatEntry(entry, true));
                    return true;
                }
                return false;
            }
        };
    }
}