[jira] [Comment Edited] (SPARK-22560) Must create spark session directly to connect to hive

["Ran Mingxuan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-22560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16262093#comment-16262093 ] 

Ran Mingxuan edited comment on SPARK-22560 at 11/22/17 7:47 AM:
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I think the problem is introduced by org.apache.spark.sql.internal.SessionState which will take the option of sparkcontext. That means the `enableHiveSupport()` won't work in this case if spark session is built from spark context.


{code:java}
// enableHiveSupport() will not be able to be got here
  @InterfaceStability.Unstable
  @transient
  lazy val sessionState: SessionState = {
    parentSessionState
      .map(_.clone(this))
      .getOrElse {
        val state = SparkSession.instantiateSessionState(
          SparkSession.sessionStateClassName(sparkContext.conf),
          self)
        initialSessionOptions.foreach { case (k, v) => state.conf.setConfString(k, v) }
        state
      }
  }
{code}



was (Author: ranmx):
I think the problem is introduced by org.apache.spark.sql.internal.SessionState which will take the option of sparkcontext. That means the `enableHiveSupport()` won't work in this case if spark session is built from spark context.

> Must create spark session directly to connect to hive
> -----------------------------------------------------
>
>                 Key: SPARK-22560
>                 URL: https://issues.apache.org/jira/browse/SPARK-22560
>             Project: Spark
>          Issue Type: Bug
>          Components: Java API, SQL
>    Affects Versions: 2.1.0
>            Reporter: Ran Mingxuan
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> In a java project I have to use both JavaSparkContext  and SparkSession. I find the order to create them affect hive connection.
> I have built a spark job like below:
> {code:java}
> // wrong code
> public void main(String[] args)
> {
>     SparkConf sparkConf = new SparkConf().setAppName("testApp");
>     JavaSparkContext sc = new JavaSparkContext(sparkConf);
>     SparkSession spark = SparkSession.builder().sparkContext(sc.sc()).enableHiveSupport().getOrCreate();
>     spark.sql("show databases").show();
> }
> {code}
> and with this code spark job will not be able to find hive meta-store even if it can discover correct warehouse.
> I have to use code like below to make things work:
> {code:java}
> // correct code 
> public String main(String[] args)
> {
>     SparkConf sparkConf = new SparkConf().setAppName("testApp");
>     SparkSession spark = SparkSession.builder().config(sparkConf).enableHiveSupport().getOrCreate();
>     SparkContext sparkContext = spark.sparkContext();
>     JavaSparkContext sc = JavaSparkContext.fromSparkContext(sparkContext);
>     spark.sql("show databases").show();
> }
> {code}



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