/*
* 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.accumulo.examples.simple.shard;
import java.util.Map.Entry;
import org.apache.accumulo.core.cli.BatchWriterOpts;
import org.apache.accumulo.core.cli.ClientOpts;
import org.apache.accumulo.core.cli.ScannerOpts;
import org.apache.accumulo.core.client.BatchWriter;
import org.apache.accumulo.core.client.Connector;
import org.apache.accumulo.core.client.Scanner;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Mutation;
import org.apache.accumulo.core.data.Value;
import org.apache.hadoop.io.Text;
import com.beust.jcommander.Parameter;
/**
* The program reads an accumulo table written by {@link Index} and writes out to another table. It writes out a mapping of documents to terms. The document to
* term mapping is used by {@link ContinuousQuery}.
*
* See docs/examples/README.shard for instructions.
*/
public class Reverse {
static class Opts extends ClientOpts {
@Parameter(names="--shardTable")
String shardTable = "shard";
@Parameter(names="--doc2Term")
String doc2TermTable = "doc2Term";
}
public static void main(String[] args) throws Exception {
Opts opts = new Opts();
ScannerOpts scanOpts = new ScannerOpts();
BatchWriterOpts bwOpts = new BatchWriterOpts();
opts.parseArgs(Reverse.class.getName(), args, scanOpts, bwOpts);
Connector conn = opts.getConnector();
Scanner scanner = conn.createScanner(opts.shardTable, opts.auths);
scanner.setBatchSize(scanOpts.scanBatchSize);
BatchWriter bw = conn.createBatchWriter(opts.doc2TermTable, bwOpts.getBatchWriterConfig());
for (Entry<Key,Value> entry : scanner) {
Key key = entry.getKey();
Mutation m = new Mutation(key.getColumnQualifier());
m.put(key.getColumnFamily(), new Text(), new Value(new byte[0]));
bw.addMutation(m);
}
bw.close();
}
}