[SPARK-5751] [SQL] Sets SPARK_HOME as SPARK_PID_DIR when running Thrift server test suites

This is a follow-up of #4720. By default, `spark-daemon.sh` writes PID files under `/tmp`, which makes it impossible to start multiple server instances simultaneously. This PR sets `SPARK_PID_DIR` to Spark home directory to workaround this problem.

Many thanks to chenghao-intel for pointing out this issue!

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Author: Cheng Lian <lian@databricks.com>

Closes #4758 from liancheng/thriftserver-pid-dir and squashes the following commits:

252fa0f [Cheng Lian] Uses temporary directory as Thrift server PID directory
1b3d1e3 [Cheng Lian] Sets SPARK_HOME as SPARK_PID_DIR when running Thrift server test suites

(cherry picked from commit 8c468a6)
Signed-off-by: Cheng Lian <lian@databricks.com>

Author: liancheng

sql/hive-thriftserver/src/test/scala/org/apache/spark/sql/hive/thriftserver/HiveThriftServer2Suites.scala

@@ -39,6 +39,7 @@ import org.scalatest.{BeforeAndAfterAll, FunSuite}
 import org.apache.spark.Logging
 import org.apache.spark.sql.catalyst.util
 import org.apache.spark.sql.hive.HiveShim
+import org.apache.spark.util.Utils
 
 object TestData {
   def getTestDataFilePath(name: String) = {
@@ -273,6 +274,7 @@ abstract class HiveThriftServer2Test extends FunSuite with BeforeAndAfterAll wit
   private var metastorePath: File = _
   private def metastoreJdbcUri = s"jdbc:derby:;databaseName=$metastorePath;create=true"
 
+  private val pidDir: File = Utils.createTempDir("thriftserver-pid")
   private var logPath: File = _
   private var logTailingProcess: Process = _
   private var diagnosisBuffer: ArrayBuffer[String] = ArrayBuffer.empty[String]
@@ -315,7 +317,14 @@ abstract class HiveThriftServer2Test extends FunSuite with BeforeAndAfterAll wit
 
     logInfo(s"Trying to start HiveThriftServer2: port=$port, mode=$mode, attempt=$attempt")
 
-    logPath = Process(command, None, "SPARK_TESTING" -> "0").lines.collectFirst {
+    val env = Seq(
+      // Disables SPARK_TESTING to exclude log4j.properties in test directories.
+      "SPARK_TESTING" -> "0",
+      // Points SPARK_PID_DIR to SPARK_HOME, otherwise only 1 Thrift server instance can be started
+      // at a time, which is not Jenkins friendly.
+      "SPARK_PID_DIR" -> pidDir.getCanonicalPath)
+
+    logPath = Process(command, None, env: _*).lines.collectFirst {
       case line if line.contains(LOG_FILE_MARK) => new File(line.drop(LOG_FILE_MARK.length))
     }.getOrElse {
       throw new RuntimeException("Failed to find HiveThriftServer2 log file.")
@@ -346,7 +355,7 @@ abstract class HiveThriftServer2Test extends FunSuite with BeforeAndAfterAll wit
 
   private def stopThriftServer(): Unit = {
     // The `spark-daemon.sh' script uses kill, which is not synchronous, have to wait for a while.
-    Process(stopScript, None).run().exitValue()
+    Process(stopScript, None, "SPARK_PID_DIR" -> pidDir.getCanonicalPath).run().exitValue()
     Thread.sleep(3.seconds.toMillis)
 
     warehousePath.delete()