com.ibm.jaql.io.hbase.JaqlTableOutputFormat.java Source code

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Here is the source code for com.ibm.jaql.io.hbase.JaqlTableOutputFormat.java

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/*
 * Copyright (C) IBM Corp. 2008.
 * 
 * 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.ibm.jaql.io.hbase;

import java.io.IOException;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.mapred.TableOutputFormat;
import org.apache.hadoop.mapred.FileAlreadyExistsException;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.InvalidJobConfException;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.util.Progressable;
import org.apache.log4j.Logger;

import com.ibm.jaql.io.hadoop.JsonHolder;
import com.ibm.jaql.json.type.JsonRecord;
import com.ibm.jaql.lang.util.JaqlUtil;

/**
 * 
 */
public class JaqlTableOutputFormat extends FileOutputFormat<JsonHolder, JsonHolder> {

    static final Logger LOG = Logger.getLogger(JaqlTableOutputFormat.class.getName());

    /**
     * 
     */
    public JaqlTableOutputFormat() {
    }

    /**
     * 
     */
    protected class JaqlTableRecordWriter implements RecordWriter<JsonHolder, JsonHolder> {
        private HTable m_table;

        /**
         * @param table
         */
        public JaqlTableRecordWriter(HTable table) {
            m_table = table;
        }

        /*
         * (non-Javadoc)
         * 
         * @see org.apache.hadoop.mapred.RecordWriter#close(org.apache.hadoop.mapred.Reporter)
         */
        public void close(Reporter reporter) {
            if (m_table == null) {
                LOG.info("attempting to close a non-existent table");
            }
        }

        /*
         * (non-Javadoc)
         * 
         * @see org.apache.hadoop.mapred.RecordWriter#write(java.lang.Object,
         *      java.lang.Object)
         */
        public void write(JsonHolder key, JsonHolder value) throws IOException {
            HBaseStore.Util.writeJMapToHBase(key.value, (JsonRecord) JaqlUtil.enforceNonNull(value.value), m_table,
                    true);
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.hadoop.mapred.OutputFormatBase#getRecordWriter(org.apache.hadoop.fs.FileSystem,
     *      org.apache.hadoop.mapred.JobConf, java.lang.String,
     *      org.apache.hadoop.util.Progressable)
     */
    @Override
    public RecordWriter<JsonHolder, JsonHolder> getRecordWriter(FileSystem ignored, JobConf job, String name,
            Progressable progress) throws IOException {

        // expecting exactly one path

        String tableName = job.get(TableOutputFormat.OUTPUT_TABLE);

        HTable table = null;
        try {
            table = new HTable(new HBaseConfiguration(), tableName);
        } catch (Exception e) {
            LOG.error(e);
        }
        return new JaqlTableRecordWriter(table);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.hadoop.mapred.OutputFormatBase#checkOutputSpecs(org.apache.hadoop.fs.FileSystem,
     *      org.apache.hadoop.mapred.JobConf)
     */
    @Override
    public void checkOutputSpecs(FileSystem ignored, JobConf job)
            throws FileAlreadyExistsException, InvalidJobConfException, IOException {

        String tableName = job.get(TableOutputFormat.OUTPUT_TABLE);
        if (tableName == null) {
            throw new IOException("Must specify table name");
        }
    }
}