com.facebook.hiveio.output.OutputCmd.java Source code

Introduction

Here is the source code for com.facebook.hiveio.output.OutputCmd.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 com.facebook.hiveio.output;

import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.facebook.hiveio.options.BaseCmd;
import com.facebook.hiveio.record.HiveRecordFactory;
import com.facebook.hiveio.record.HiveWritableRecord;
import io.airlift.command.Command;

import javax.inject.Inject;

/**
 * Command for writing to a table
 */
@Command(name = "output")
public class OutputCmd extends BaseCmd {
    /** Number of columns */
    public static final int NUM_COLUMNS = 4;

    /** Logger */
    private static final Logger LOG = LoggerFactory.getLogger(OutputCmd.class);

    /** Command line args */
    @Inject
    private OutputArgs args = new OutputArgs();

    /**
     * Before running this:
        
     CREATE TABLE IF NOT EXISTS hiveio_output_test(
       i1 BIGINT,
       d2 DOUBLE,
       b3 BOOLEAN,
       s4 STRING
     ) TBLPROPERTIES ('RETENTION_PLATINUM'='90')
        
     CREATE TABLE IF NOT EXISTS hiveio_output_test_partitioned (
       i1 BIGINT,
       d2 DOUBLE,
       b3 BOOLEAN,
       s4 STRING
     )
     PARTITIONED BY (ds STRING)
     TBLPROPERTIES ('RETENTION_PLATINUM'='90')
        
     * @throws Exception
     */
    @Override
    public void execute() throws Exception {
        args.table.process();

        Context context = new Context();
        context.conf.setInt("mapred.task.partition", 1);

        HiveOutputDescription outputDesc = new HiveOutputDescription();
        outputDesc.getTableDesc().setDatabaseName(args.table.database);
        outputDesc.getTableDesc().setTableName(args.table.table);
        outputDesc.getMetastoreDesc().setHost(args.metastore.host);
        outputDesc.getMetastoreDesc().setPort(args.metastore.port);
        if (args.table.partitioned) {
            outputDesc.putPartitionValue("ds", "2013-04-01");
        }

        context.outputFormat = new HiveApiOutputFormat();
        context.outputFormat.init(context.conf, outputDesc);

        PerThread threadLocal = context.perThread.get();
        context.outputFormat.checkOutputSpecs(threadLocal.jobContext());

        HiveApiOutputCommitter outputCommitter = context.outputFormat.getOutputCommitter(threadLocal.taskContext());

        context.schema = context.outputFormat.getTableSchema(context.conf);

        outputCommitter.setupJob(threadLocal.jobContext());

        if (args.multiThread.isMultiThreaded()) {
            multiThreaded(context);
        } else {
            singleThreaded(context);
        }

        outputCommitter.commitJob(threadLocal.jobContext());
    }

    /**
     * Single threaded execution
     *
     * @param context Context
     * @throws Exception
     */
    private void singleThreaded(Context context) throws Exception {
        write(context);
    }

    /**
     * Multi threaded execution
     *
     * @param context Context
     * @throws InterruptedException
     */
    private void multiThreaded(final Context context) throws InterruptedException {
        Thread[] threads = new Thread[args.multiThread.threads];
        for (int i = 0; i < args.multiThread.threads; ++i) {
            final int threadId = i + 1;
            threads[i] = new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        write(context);
                        // CHECKSTYLE: stop IllegalCatch
                    } catch (Exception e) {
                        // CHECKSTYLE: resume IllegalCatch
                        LOG.error("Thread {} failed to write", Thread.currentThread().getId(), e);
                    }
                }
            });
            threads[i].setName("writer-" + threadId);
            threads[i].start();
        }
        for (Thread thread : threads) {
            thread.join();
        }
    }

    /**
     * Write output
     *
     * @param context Context
     * @throws Exception
     */
    public void write(Context context) throws Exception {
        PerThread threadLocal = context.perThread.get();

        HiveApiOutputCommitter outputCommitter = context.outputFormat.getOutputCommitter(threadLocal.taskContext());

        outputCommitter.setupTask(threadLocal.taskContext());

        RecordWriter<WritableComparable, HiveWritableRecord> recordWriter = context.outputFormat
                .getRecordWriter(threadLocal.taskContext());

        HiveWritableRecord record = HiveRecordFactory.newWritableRecord(context.schema);

        // TODO: allow type promotions: see https://github.com/facebook/hive-io-experimental/issues/15
        record.set(0, 11L);
        record.set(1, 22.22);
        record.set(2, true);
        record.set(3, "foo");
        recordWriter.write(NullWritable.get(), record);

        record.set(0, 33L);
        record.set(1, 44.44);
        record.set(2, false);
        record.set(3, "bar");
        recordWriter.write(NullWritable.get(), record);

        recordWriter.close(threadLocal.taskContext());

        if (outputCommitter.needsTaskCommit(threadLocal.taskContext())) {
            outputCommitter.commitTask(threadLocal.taskContext());
        }
    }
}