com.marklogic.mapreduce.NodeOutputFormat Maven / Gradle / Ivy
/*
* Copyright (c) 2019 MarkLogic Corporation
*
* 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 com.marklogic.mapreduce;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.DefaultStringifier;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import com.marklogic.mapreduce.utilities.InternalUtilities;
import com.marklogic.mapreduce.utilities.TextArrayWritable;
import com.marklogic.xcc.ContentSource;
/**
* MarkLogicOutputFormat for Node.
*
*
* Use this class to store MapReduce results as XML nodes in a MarkLogic
* database. Use this class with output key-value pairs where the key is
* {@link NodePath} and the value is a {@link MarkLogicNode} to be
* inserted into the database relative to the node path in the key.
*
*
* Where the node is inserted relative to the path is controlled by the
* {@link MarkLogicConstants#NODE_OPERATION_TYPE output.node.optype} configuration
* property. You must set this property when using {@link NodeOutputFormat}.
*
*
* @see NodeOpType
* @see MarkLogicConstants#NODE_OPERATION_TYPE
* @author jchen
*/
public class NodeOutputFormat
extends MarkLogicOutputFormat {
public static final Log LOG =
LogFactory.getLog(NodeOutputFormat.class);
@Override
public RecordWriter getRecordWriter(
TaskAttemptContext context) throws IOException, InterruptedException {
Configuration conf = context.getConfiguration();
TextArrayWritable hosts = getHosts(conf);
String host = InternalUtilities.getHost(hosts);
return new NodeWriter(conf, host);
}
@Override
public void checkOutputSpecs(Configuration conf, ContentSource cs)
throws IOException {
// warn against unsupported configuration
if (conf.get(BATCH_SIZE) != null) {
LOG.warn("Config entry for " +
"\"mapreduce.marklogic.output.batchsize\" is not " +
"supported for " + this.getClass().getName() +
" and will be ignored.");
}
// store hosts into config system
DefaultStringifier.store(conf, queryHosts(cs), OUTPUT_FOREST_HOST);
}
}