OrcCompactionReducer.java 文件源码

/**
 * {@inheritDoc}
 */
protected void reduce(final Text key, final Iterable<OrcValue> values, final Context context) throws IOException, InterruptedException {
    final Configuration configuration = context.getConfiguration();
    final String sourcePath = configuration.get("compactionSourcePath");
    final String targetPath = configuration.get("compactionTargetPath");

    // Reducer stores data at the target directory retaining the directory structure of files
    String filePath = key.toString().replace(sourcePath, targetPath);
    if (key.toString().endsWith("/")) {
        filePath = filePath.concat("file");
    }

    log.info("Compaction output path {}", filePath);
    final URI uri = URI.create(filePath);
    final MultipleOutputs multipleOutputs = new MultipleOutputs<NullWritable, OrcValue>(context);
    try {
        for (final OrcValue text : values) {
            multipleOutputs.write(NullWritable.get(), text, uri.toString());
        }
    } finally {
        multipleOutputs.close();
    }
}