buildlackey

def updateTimeZone(tz: String, sessionTz: String)  = {
    import java.time._
    import java.util.TimeZone
    System.setProperty("user.timezone", tz);
    TimeZone.setDefault(TimeZone.getTimeZone(tz))
    spark.conf.set("spark.sql.session.timeZone", sessionTz)
}

buildlackey

val savedTz = spark.conf.get("spark.sql.session.timeZone")
spark.conf.set("spark.sql.session.timeZone", "GMT")
List("1970-01-01T00:00:00-01:00").toDF("timestr").
        withColumn("ts", col("timestr").cast("timestamp")).
        withColumn("tsAsInt", col("ts").cast("integer")).
        withColumn("asUtc", date_format($"ts", "yyyy-MM-dd'T'HH:mm:ssX")).
        show(false)
spark.conf.set("spark.sql.session.timeZone", savedTz )
// RESULT:
// +-------------------------+-------------------+-------+--------------------+

buildlackey

 // Will work on MacOS and Linux, 
 // but needs slight modification on Windows where noted

 import java.io.{FileOutputStream, PrintWriter}
 import org.apache.spark.sql.types._
 import sys.process._


 System.setProperty("user.timezone", "PST");
 TimeZone.setDefault(TimeZone.getTimeZone("PST"))

buildlackey

import java.util.TimeZone


def updateTimeZone(zone: String)  = {
    System.setProperty("user.timezone", zone);
    TimeZone.setDefault(TimeZone.getTimeZone(zone))
} 

// Set timezone to Pacific Standard, where -- at least for now --
// daylight savings is in effect 

buildlackey

it should "output the result as soon as it arrives without watermark" in {
  val mainEventsStream = new MemoryStream[MainEvent](1, sparkSession.sqlContext)
  val joinedEventsStream = new MemoryStream[JoinedEvent](2, sparkSession.sqlContext)
 
  val stream = mainEventsStream.toDS().join(joinedEventsStream.toDS(), $"mainKey" === $"joinedKey")
 
  val query = stream.writeStream.foreach(RowProcessor).start()
 
  while (!query.isActive) {}
  new Thread(new Runnable() {

buildlackey

[root@RESCUE-master /]# fdisk -l

Disk /dev/xvdc: 2147 MB, 2147483648 bytes
22 heads, 16 sectors/track, 11915 cylinders
Units = cylinders of 352 * 512 = 180224 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0006cf9d

    Device Boot      Start         End      Blocks   Id  System