[SPARK-1087] Move python traceback utilities into new traceback_utils…

….py file.

python/pyspark/context.py

@@ -33,6 +33,7 @@
 from pyspark.storagelevel import StorageLevel
 from pyspark import rdd
 from pyspark.rdd import RDD
+from pyspark.traceback_utils import extract_concise_traceback
 
 from py4j.java_collections import ListConverter
 
@@ -99,8 +100,8 @@ def __init__(self, master=None, appName=None, sparkHome=None, pyFiles=None,
             ...
         ValueError:...
         """
-        if rdd._extract_concise_traceback() is not None:
-            self._callsite = rdd._extract_concise_traceback()
+        if extract_concise_traceback() is not None:
+            self._callsite = extract_concise_traceback()
         else:
             tempNamedTuple = namedtuple("Callsite", "function file linenum")
             self._callsite = tempNamedTuple(function=None, file=None, linenum=None)

python/pyspark/rdd.py

@@ -18,13 +18,11 @@
 from base64 import standard_b64encode as b64enc
 import copy
 from collections import defaultdict
-from collections import namedtuple
 from itertools import chain, ifilter, imap
 import operator
 import os
 import sys
 import shlex
-import traceback
 from subprocess import Popen, PIPE
 from tempfile import NamedTemporaryFile
 from threading import Thread
@@ -45,6 +43,7 @@
 from pyspark.resultiterable import ResultIterable
 from pyspark.shuffle import Aggregator, InMemoryMerger, ExternalMerger, \
     get_used_memory, ExternalSorter
+from pyspark.traceback_utils import JavaStackTrace
 
 from py4j.java_collections import ListConverter, MapConverter
 
@@ -81,57 +80,6 @@ def portable_hash(x):
     return hash(x)
 
 
-def _extract_concise_traceback():
-    """
-    This function returns the traceback info for a callsite, returns a dict
-    with function name, file name and line number
-    """
-    tb = traceback.extract_stack()
-    callsite = namedtuple("Callsite", "function file linenum")
-    if len(tb) == 0:
-        return None
-    file, line, module, what = tb[len(tb) - 1]
-    sparkpath = os.path.dirname(file)
-    first_spark_frame = len(tb) - 1
-    for i in range(0, len(tb)):
-        file, line, fun, what = tb[i]
-        if file.startswith(sparkpath):
-            first_spark_frame = i
-            break
-    if first_spark_frame == 0:
-        file, line, fun, what = tb[0]
-        return callsite(function=fun, file=file, linenum=line)
-    sfile, sline, sfun, swhat = tb[first_spark_frame]
-    ufile, uline, ufun, uwhat = tb[first_spark_frame - 1]
-    return callsite(function=sfun, file=ufile, linenum=uline)
-
-_spark_stack_depth = 0
-
-
-class _JavaStackTrace(object):
-
-    def __init__(self, sc):
-        tb = _extract_concise_traceback()
-        if tb is not None:
-            self._traceback = "%s at %s:%s" % (
-                tb.function, tb.file, tb.linenum)
-        else:
-            self._traceback = "Error! Could not extract traceback info"
-        self._context = sc
-
-    def __enter__(self):
-        global _spark_stack_depth
-        if _spark_stack_depth == 0:
-            self._context._jsc.setCallSite(self._traceback)
-        _spark_stack_depth += 1
-
-    def __exit__(self, type, value, tb):
-        global _spark_stack_depth
-        _spark_stack_depth -= 1
-        if _spark_stack_depth == 0:
-            self._context._jsc.setCallSite(None)
-
-
 class BoundedFloat(float):
     """
     Bounded value is generated by approximate job, with confidence and low
@@ -704,7 +652,7 @@ def collect(self):
         """
         Return a list that contains all of the elements in this RDD.
         """
-        with _JavaStackTrace(self.context) as st:
+        with JavaStackTrace(self.context) as st:
             bytesInJava = self._jrdd.collect().iterator()
         return list(self._collect_iterator_through_file(bytesInJava))
 
@@ -1515,7 +1463,7 @@ def add_shuffle_key(split, iterator):
 
         keyed = self.mapPartitionsWithIndex(add_shuffle_key)
         keyed._bypass_serializer = True
-        with _JavaStackTrace(self.context) as st:
+        with JavaStackTrace(self.context) as st:
             pairRDD = self.ctx._jvm.PairwiseRDD(
                 keyed._jrdd.rdd()).asJavaPairRDD()
             partitioner = self.ctx._jvm.PythonPartitioner(numPartitions,

python/pyspark/traceback_utils.py

@@ -0,0 +1,80 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+from collections import namedtuple
+import os
+import traceback
+
+
+__all__ = ["extract_concise_traceback", "SparkContext"]
+
+
+def extract_concise_traceback():
+    """
+    This function returns the traceback info for a callsite, returns a dict
+    with function name, file name and line number
+    """
+    tb = traceback.extract_stack()
+    callsite = namedtuple("Callsite", "function file linenum")
+    if len(tb) == 0:
+        return None
+    file, line, module, what = tb[len(tb) - 1]
+    sparkpath = os.path.dirname(file)
+    first_spark_frame = len(tb) - 1
+    for i in range(0, len(tb)):
+        file, line, fun, what = tb[i]
+        if file.startswith(sparkpath):
+            first_spark_frame = i
+            break
+    if first_spark_frame == 0:
+        file, line, fun, what = tb[0]
+        return callsite(function=fun, file=file, linenum=line)
+    sfile, sline, sfun, swhat = tb[first_spark_frame]
+    ufile, uline, ufun, uwhat = tb[first_spark_frame - 1]
+    return callsite(function=sfun, file=ufile, linenum=uline)
+
+
+class JavaStackTrace(object):
+    """
+    Helper for setting the spark context call site.
+
+    Example usage:
+    from pyspark.context import JavaStackTrace
+    with JavaStackTrace(<relevant SparkContext>) as st:
+        <a Spark call>
+    """
+
+    _spark_stack_depth = 0
+
+    def __init__(self, sc):
+        tb = extract_concise_traceback()
+        if tb is not None:
+            self._traceback = "%s at %s:%s" % (
+                tb.function, tb.file, tb.linenum)
+        else:
+            self._traceback = "Error! Could not extract traceback info"
+        self._context = sc
+
+    def __enter__(self):
+        if JavaStackTrace._spark_stack_depth == 0:
+            self._context._jsc.setCallSite(self._traceback)
+        JavaStackTrace._spark_stack_depth += 1
+
+    def __exit__(self, type, value, tb):
+        JavaStackTrace._spark_stack_depth -= 1
+        if JavaStackTrace._spark_stack_depth == 0:
+            self._context._jsc.setCallSite(None)