org.apache.tajo.storage.hbase.HFileAppender.java Source code

Introduction

Here is the source code for org.apache.tajo.storage.hbase.HFileAppender.java

Source

/**
 * 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.tajo.storage.hbase;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.mapreduce.HFileOutputFormat2;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.TaskAttemptID;
import org.apache.hadoop.mapreduce.TaskType;
import org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl;
import org.apache.tajo.ExecutionBlockId;
import org.apache.tajo.TaskAttemptId;
import org.apache.tajo.TajoConstants;
import org.apache.tajo.catalog.Schema;
import org.apache.tajo.catalog.TableMeta;
import org.apache.tajo.datum.Datum;
import org.apache.tajo.storage.Tuple;
import org.apache.tajo.util.Bytes;

import java.io.IOException;
import java.util.TreeSet;

public class HFileAppender extends AbstractHBaseAppender {
    private static final Log LOG = LogFactory.getLog(HFileAppender.class);

    private RecordWriter<ImmutableBytesWritable, Cell> writer;
    private TaskAttemptContext writerContext;
    private Path workingFilePath;
    private FileOutputCommitter committer;

    public HFileAppender(Configuration conf, TaskAttemptId taskAttemptId, Schema schema, TableMeta meta,
            Path stagingDir) {
        super(conf, taskAttemptId, schema, meta, stagingDir);
    }

    @Override
    public void init() throws IOException {
        super.init();

        Configuration taskConf = new Configuration();
        Path stagingResultDir = new Path(stagingDir, TajoConstants.RESULT_DIR_NAME);
        taskConf.set(FileOutputFormat.OUTDIR, stagingResultDir.toString());

        ExecutionBlockId ebId = taskAttemptId.getTaskId().getExecutionBlockId();
        writerContext = new TaskAttemptContextImpl(taskConf, new TaskAttemptID(ebId.getQueryId().toString(),
                ebId.getId(), TaskType.MAP, taskAttemptId.getTaskId().getId(), taskAttemptId.getId()));

        HFileOutputFormat2 hFileOutputFormat2 = new HFileOutputFormat2();
        try {
            writer = hFileOutputFormat2.getRecordWriter(writerContext);

            committer = new FileOutputCommitter(FileOutputFormat.getOutputPath(writerContext), writerContext);
            workingFilePath = committer.getWorkPath();
        } catch (InterruptedException e) {
            throw new IOException(e.getMessage(), e);
        }

        LOG.info("Created hbase file writer: " + workingFilePath);
    }

    long totalNumBytes = 0;
    ImmutableBytesWritable keyWritable = new ImmutableBytesWritable();
    boolean first = true;
    TreeSet<KeyValue> kvSet = new TreeSet<KeyValue>(KeyValue.COMPARATOR);

    @Override
    public void addTuple(Tuple tuple) throws IOException {
        Datum datum;

        byte[] rowkey = getRowKeyBytes(tuple);

        if (!first && !Bytes.equals(keyWritable.get(), 0, keyWritable.getLength(), rowkey, 0, rowkey.length)) {
            try {
                for (KeyValue kv : kvSet) {
                    writer.write(keyWritable, kv);
                    totalNumBytes += keyWritable.getLength() + kv.getLength();
                }
                kvSet.clear();
                // Statistical section
                if (enabledStats) {
                    stats.incrementRow();
                }
            } catch (InterruptedException e) {
                LOG.error(e.getMessage(), e);
            }
        }

        first = false;

        keyWritable.set(rowkey);

        readKeyValues(tuple, rowkey);
        if (keyValues != null) {
            for (KeyValue eachKeyVal : keyValues) {
                kvSet.add(eachKeyVal);
            }
        }
    }

    @Override
    public void flush() throws IOException {
    }

    @Override
    public long getEstimatedOutputSize() throws IOException {
        // StoreTableExec uses this value as rolling file length
        // Not rolling
        return 0;
    }

    @Override
    public void close() throws IOException {
        if (!kvSet.isEmpty()) {
            try {
                for (KeyValue kv : kvSet) {
                    writer.write(keyWritable, kv);
                    totalNumBytes += keyWritable.getLength() + keyWritable.getLength();
                }
                kvSet.clear();
                // Statistical section
                if (enabledStats) {
                    stats.incrementRow();
                }
            } catch (InterruptedException e) {
                LOG.error(e.getMessage(), e);
            }
        }

        if (enabledStats) {
            stats.setNumBytes(totalNumBytes);
        }
        if (writer != null) {
            try {
                writer.close(writerContext);
                committer.commitTask(writerContext);
            } catch (InterruptedException e) {
            }
        }
    }
}