Spark-Avro学习3之使用AvroCompression存储AVRO文件

更多Spark学习examples代码请见：https://github.com/xubo245/SparkLearning

1.说明：

使用不同的压缩level对avro数据进行压缩

2.代码：

/**
 * @author xubo
 * @time 20160502
 * ref https://github.com/databricks/spark-avro
 */
package org.apache.spark.avro.learning

import org.apache.spark.sql.SQLContext
import org.apache.spark.SparkConf
import org.apache.spark.SparkContext
import java.text.SimpleDateFormat
import java.util.Date
/**
 * Avro Compression different level 
 */
object AvroCompression {
  def main(args: Array[String]) {
    val conf = new SparkConf().setAppName("AvroCompression").setMaster("local")
    val sc = new SparkContext(conf)
    // import needed for the .avro method to be added
    import com.databricks.spark.avro._

    val sqlContext = new SQLContext(sc)
    sqlContext.setConf("spark.sql.avro.compression.codec", "deflate")
    sqlContext.setConf("spark.sql.avro.deflate.level", "5")
    
    // The Avro records get converted to Spark types, filtered, and
    // then written back out as Avro records
    val df = sqlContext.read
      .format("com.databricks.spark.avro")
      .load("file/data/avro/input/episodes.avro")
    df.show

    val iString = new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date())

    df.filter("doctor > 5").write
      .format("com.databricks.spark.avro")
      .save("file/data/avro/output/episodes/AvroCompression" + iString)
    df.filter("doctor > 5").show

  }
}

3.结果：

+--------------------+----------------+------+
|               title|        air_date|doctor|
+--------------------+----------------+------+
|   The Eleventh Hour|    3 April 2010|    11|
|   The Doctor's Wife|     14 May 2011|    11|
| Horror of Fang Rock|3 September 1977|     4|
|  An Unearthly Child|23 November 1963|     1|
|The Mysterious Pl...|6 September 1986|     6|
|                Rose|   26 March 2005|     9|
|The Power of the ...| 5 November 1966|     2|
|          Castrolava|  4 January 1982|     5|
+--------------------+----------------+------+

+--------------------+----------------+------+
|               title|        air_date|doctor|
+--------------------+----------------+------+
|   The Eleventh Hour|    3 April 2010|    11|
|   The Doctor's Wife|     14 May 2011|    11|
|The Mysterious Pl...|6 September 1986|     6|
|                Rose|   26 March 2005|     9|
+--------------------+----------------+------+

4.存储文件：

Obj
avro.codecdeflateavro.schema�{"type":"record","name":"topLevelRecord","fields":[{"name":"title","type":["string","null"]},{"name":"air_date","type":["string","null"]},{"name":"doctor","type":["int","null"]}]}

379bytes

没修改默认压缩level的为391bytes