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commit 8f6a3a50b4b86bed008250824b0c304df9952762
Author: Ivan Sadikov <ivan.sadi...@databricks.com>
AuthorDate: Tue May 3 08:30:05 2022 +0900
[SPARK-39084][PYSPARK] Fix df.rdd.isEmpty() by using TaskContext to stop
iterator on task completion
This PR fixes the issue described in
https://issues.apache.org/jira/browse/SPARK-39084 where calling
`df.rdd.isEmpty()` on a particular dataset could result in a JVM crash and/or
executor failure.
The issue was due to Python iterator not being synchronised with Java
iterator so when the task is complete, the Python iterator continues to process
data. We have introduced ContextAwareIterator as part of
https://issues.apache.org/jira/browse/SPARK-33277 but we did not fix all of the
places where this should be used.
Fixes the JVM crash when checking isEmpty() on a dataset.
No.
I added a test case that reproduces the issue 100%. I confirmed that the
test fails without the fix and passes with the fix.
Closes #36425 from sadikovi/fix-pyspark-iter-2.
Authored-by: Ivan Sadikov <ivan.sadi...@databricks.com>
Signed-off-by: Hyukjin Kwon <gurwls...@apache.org>
(cherry picked from commit 9305cc744d27daa6a746d3eb30e7639c63329072)
Signed-off-by: Hyukjin Kwon <gurwls...@apache.org>
---
python/pyspark/sql/tests/test_dataframe.py | 36 ++++++++++++++++++++++
.../sql/execution/python/EvaluatePython.scala | 3 +-
2 files changed, 38 insertions(+), 1 deletion(-)
diff --git a/python/pyspark/sql/tests/test_dataframe.py
b/python/pyspark/sql/tests/test_dataframe.py
index e3977e81851..6b9ac24d8c1 100644
--- a/python/pyspark/sql/tests/test_dataframe.py
+++ b/python/pyspark/sql/tests/test_dataframe.py
@@ -21,6 +21,7 @@ import shutil
import tempfile
import time
import unittest
+import uuid
from pyspark.sql import SparkSession, Row
from pyspark.sql.types import StringType, IntegerType, DoubleType, StructType,
StructField, \
@@ -837,6 +838,41 @@ class DataFrameTests(ReusedSQLTestCase):
finally:
shutil.rmtree(tpath)
+ def test_df_is_empty(self):
+ # SPARK-39084: Fix df.rdd.isEmpty() resulting in JVM crash.
+
+ # This particular example of DataFrame reproduces an issue in isEmpty
call
+ # which could result in JVM crash.
+ data = []
+ for t in range(0, 10000):
+ id = str(uuid.uuid4())
+ if t == 0:
+ for i in range(0, 99):
+ data.append((id,))
+ elif t < 10:
+ for i in range(0, 75):
+ data.append((id,))
+ elif t < 100:
+ for i in range(0, 50):
+ data.append((id,))
+ elif t < 1000:
+ for i in range(0, 25):
+ data.append((id,))
+ else:
+ for i in range(0, 10):
+ data.append((id,))
+
+ tmpPath = tempfile.mkdtemp()
+ shutil.rmtree(tmpPath)
+ try:
+ df = self.spark.createDataFrame(data, ["col"])
+ df.coalesce(1).write.parquet(tmpPath)
+
+ res = self.spark.read.parquet(tmpPath).groupBy("col").count()
+ self.assertFalse(res.rdd.isEmpty())
+ finally:
+ shutil.rmtree(tmpPath)
+
class QueryExecutionListenerTests(unittest.TestCase, SQLTestUtils):
# These tests are separate because it uses
'spark.sql.queryExecutionListeners' which is
diff --git
a/sql/core/src/main/scala/org/apache/spark/sql/execution/python/EvaluatePython.scala
b/sql/core/src/main/scala/org/apache/spark/sql/execution/python/EvaluatePython.scala
index 7fe32636308..ca33f6951e1 100644
---
a/sql/core/src/main/scala/org/apache/spark/sql/execution/python/EvaluatePython.scala
+++
b/sql/core/src/main/scala/org/apache/spark/sql/execution/python/EvaluatePython.scala
@@ -24,6 +24,7 @@ import scala.collection.JavaConverters._
import net.razorvine.pickle.{IObjectPickler, Opcodes, Pickler}
+import org.apache.spark.{ContextAwareIterator, TaskContext}
import org.apache.spark.api.python.SerDeUtil
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.catalyst.InternalRow
@@ -300,7 +301,7 @@ object EvaluatePython {
def javaToPython(rdd: RDD[Any]): RDD[Array[Byte]] = {
rdd.mapPartitions { iter =>
registerPicklers() // let it called in executor
- new SerDeUtil.AutoBatchedPickler(iter)
+ new SerDeUtil.AutoBatchedPickler(new
ContextAwareIterator(TaskContext.get, iter))
}
}
}
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