[jira] [Created] (SPARK-17467) Spark SQL: Return incorrect result for the data files on Swift

["Kevin Huang (JIRA)" <ji...@apache.org>]

Kevin Huang created SPARK-17467:
-----------------------------------

             Summary: Spark SQL: Return incorrect result for the data files on Swift
                 Key: SPARK-17467
                 URL: https://issues.apache.org/jira/browse/SPARK-17467
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 1.6.2
            Reporter: Kevin Huang


I have an AVRO file on Swift(awclassic.avro). I ran Spark SQL to count its records, but got incorrect result. The file has 60855 records, but I got 42451.

The following is the sample code I used:
{code:java}
public class SparkTest {
    
    public static void main(String[] args) throws InterruptedException, IOException {
        SparkConf sparkConf = new SparkConf()
                .setAppName("Spark-Swift-App")
                .setMaster("local[8]");
        JavaSparkContext sparkContext = new JavaSparkContext(sparkConf);
        Configuration hadoopConf = sparkContext.hadoopConfiguration();

        Configuration extraHadoopConf = new Configuration(false);
        extraHadoopConf.addResource("swift-site.xml"); // swift-site.xml is a customized file which is to store Swift configurations.
        hadoopConf.addResource(extraHadoopConf);

        SQLContext sqlContext = new SQLContext(sparkContext);
        DataFrame df = sqlContext.read().format("com.databricks.spark.avro").load("swift://bdd-edp.bddcs/awclassic/awclassic.avro");
        df.registerTempTable("awclassic");
        DataFrame result = sqlContext.sql("SELECT COUNT(*) FROM awclassic");
        result.show();
    }
}
{code}

I also found an interesting thing: if I changed the value of fs.swift.blocksize, I got different results. For details, please see the following table.
||fs.swift.blocksize ||SELECT COUNT\(*\) FROM awclassic ||
|16384(16M) | 51683|
|32768(32M) - default | 42451|
|65536(64M) | 30459|



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