[SPARK-3073] [PySpark] use external sort in sortBy() and sortByKey()

Using external sort to support sort large datasets in reduce stage.

Author: Davies Liu <[email protected]>

Closes apache#1978 from davies/sort and squashes the following commits:

bbcd9ba [Davies Liu] check spilled bytes in tests
b125d2f [Davies Liu] add test for external sort in rdd
eae0176 [Davies Liu] choose different disks from different processes and instances
1f075ed [Davies Liu] Merge branch 'master' into sort
eb53ca6 [Davies Liu] Merge branch 'master' into sort
644abaf [Davies Liu] add license in LICENSE
19f7873 [Davies Liu] improve tests
55602ee [Davies Liu] use external sort in sortBy() and sortByKey()

.rat-excludes

@@ -31,6 +31,7 @@ sorttable.js
 .*data
 .*log
 cloudpickle.py
+heapq3.py
 join.py
 SparkExprTyper.scala
 SparkILoop.scala

LICENSE

@@ -338,6 +338,289 @@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+========================================================================
+For heapq (pyspark/heapq3.py):
+========================================================================
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+# A. HISTORY OF THE SOFTWARE
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+# 0.9.0 thru 1.2              1991-1995   CWI         yes
+# 1.3 thru 1.5.2  1.2         1995-1999   CNRI        yes
+# 1.6             1.5.2       2000        CNRI        no
+# 2.0             1.6         2000        BeOpen.com  no
+# 1.6.1           1.6         2001        CNRI        yes (2)
+# 2.1             2.0+1.6.1   2001        PSF         no
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+# 2.2.3           2.2.2       2003        PSF         yes
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+# 2.3.1           2.3         2002-2003   PSF         yes
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+# 2.3.3           2.3.2       2002-2003   PSF         yes
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 ========================================================================
 For sorttable (core/src/main/resources/org/apache/spark/ui/static/sorttable.js):