gobblin.hive.avro.HiveAvroSchemaManager.java Source code

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Here is the source code for gobblin.hive.avro.HiveAvroSchemaManager.java

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/*
 * Copyright (C) 2014-2016 LinkedIn Corp. All rights reserved.
 *
 * 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.
 */

package gobblin.hive.avro;

import java.io.IOException;

import org.apache.avro.Schema;
import org.apache.commons.io.FilenameUtils;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.metastore.api.SerDeInfo;

import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;

import gobblin.annotation.Alpha;
import gobblin.configuration.State;
import gobblin.hive.HiveSchemaManager;
import gobblin.util.AvroUtils;
import gobblin.util.HadoopUtils;
import lombok.extern.slf4j.Slf4j;

/**
 * A {@link HiveSchemaManager} for registering Avro tables and partitions.
 *
 * @author ziliu
 */
@Slf4j
@Alpha
public class HiveAvroSchemaManager extends HiveSchemaManager {

    public static final String SCHEMA_LITERAL = "avro.schema.literal";

    private static final String AVRO = "avro";

    private final FileSystem fs;

    public HiveAvroSchemaManager(State props) throws IOException {
        super(props);
        this.fs = FileSystem.get(HadoopUtils.getConfFromState(props));
    }

    @Override
    public void addSchemaProperties(SerDeInfo si, Path path) {
        Schema schema = getSchema(path);

        Preconditions.checkNotNull(schema);
        si.getParameters().put(SCHEMA_LITERAL, schema.toString());
    }

    @SuppressWarnings("deprecation")
    private Schema getSchema(Path path) {
        try {
            for (FileStatus status : this.fs.listStatus(path)) {
                if (status.isDir()) {
                    Schema schema = getSchema(status.getPath());
                    if (schema != null) {
                        return schema;
                    }
                } else if (FilenameUtils.isExtension(status.getPath().getName().toLowerCase(), AVRO)) {
                    return AvroUtils.getSchemaFromDataFile(status.getPath(), this.fs);
                }
            }
            return null;
        } catch (IOException e) {
            log.error("Unable to get schema from " + path, e);
            throw Throwables.propagate(e);
        }
    }

}