[
https://issues.apache.org/jira/browse/SPARK-47740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Maxim Martynov updated SPARK-47740:
-----------------------------------
Description:
{code:python}
from pyspark.sql import SparkSession
spark = SparkSession.builder.config("spark.driver.memory",
"2g").config("spark.another.property", "hi").getOrCreate()
spark.conf.get("spark.driver.memory")
# prints '2g'
spark.conf.get("spark.another.property")
# prints 'hi'
# check for JVM process before and after stop
spark.stop()
# try to recreate Spark session with different driver memory, and no
"spark.another.property" at all
spark = SparkSession.builder.config("spark.driver.memory", "3g").getOrCreate()
spark.conf.get("spark.driver.memory")
# prints '3g'
spark.conf.get("spark.another.property")
# prints 'hi'
# check for JVM process
{code}
After first call of {{.getOrCreate()}} JVM process with following options have
been started:
{code}
maxim 76625 10.9 2.7 7975292 447068 pts/8 Sl+ 16:59 0:11
/home/maxim/.sdkman/candidates/java/current/bin/java -cp
/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/pyspark/conf:/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/pyspark/jars/*
-Xmx2g -XX:+IgnoreUnrecognizedVMOptions
--add-opens=java.base/java.lang=ALL-UNNAMED
--add-opens=java.base/java.lang.invoke=ALL-UNNAMED
--add-opens=java.base/java.lang.reflect=ALL-UNNAMED
--add-opens=java.base/java.io=ALL-UNNAMED
--add-opens=java.base/java.net=ALL-UNNAMED
--add-opens=java.base/java.nio=ALL-UNNAMED
--add-opens=java.base/java.util=ALL-UNNAMED
--add-opens=java.base/java.util.concurrent=ALL-UNNAMED
--add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED
--add-opens=java.base/sun.nio.ch=ALL-UNNAMED
--add-opens=java.base/sun.nio.cs=ALL-UNNAMED
--add-opens=java.base/sun.security.action=ALL-UNNAMED
--add-opens=java.base/sun.util.calendar=ALL-UNNAMED
--add-opens=java.security.jgss/sun.security.krb5=ALL-UNNAMED
-Djdk.reflect.useDirectMethodHandle=false org.apache.spark.deploy.SparkSubmit
--conf spark.driver.memory=2g --conf spark.another.property=hi pyspark-shell
{code}
But it have not been stopped by {{.stop()}} method call. New Spark session
which reports 3Gb of driver memory actually uses the same 2Gb, and config
options from old session which should be closed at this moment.
Summarizing:
* {{spark.stop()}} stops only SparkContext, but not JVM
* {{spark.stop()}} does not clean up session config
This behavior has been observed for a long time, at least since 2.2.0, and
still present in 3.5.1.
This could be solved by stopping JVM after Spark session is stopped.
But just calling {{spark._jvm.System.exit(0)}} fill fail because py4j socket
will be closed, and it will be impossible to start new Spark session:
{code:python}
spark._jvm.System.exit(0)
{code}
{code}
ERROR:root:Exception while sending command.
Traceback (most recent call last):
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/clientserver.py",
line 516, in send_command
raise Py4JNetworkError("Answer from Java side is empty")
py4j.protocol.Py4JNetworkError: Answer from Java side is empty
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/java_gateway.py",
line 1038, in send_command
response = connection.send_command(command)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/clientserver.py",
line 539, in send_command
raise Py4JNetworkError(
py4j.protocol.Py4JNetworkError: Error while sending or receiving
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/java_gateway.py",
line 1322, in __call__
return_value = get_return_value(
^^^^^^^^^^^^^^^^^
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/pyspark/errors/exceptions/captured.py",
line 179, in deco
return f(*a, **kw)
^^^^^^^^^^^
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/protocol.py",
line 334, in get_return_value
raise Py4JError(
py4j.protocol.Py4JError: An error occurred while calling z:java.lang.System.exit
{code}
Here is an article describing the same issue, and also providing a safe way to
stop JVM without breaking py4j (in Russian):
https://habr.com/ru/companies/sberbank/articles/805285/
{code:python}
from pyspark.sql import SparkSession
from pyspark import SparkContext
from threading import RLock
from py4j.protocol import CALL_COMMAND_NAME, END_COMMAND_PART
from pyspark.sql import SparkSession
from pyspark import SparkContext
from threading import RLock
from py4j.protocol import CALL_COMMAND_NAME, END_COMMAND_PART
def stop_spark_session(spark_session: SparkSession):
# stop spark session as usual
spark.stop()
# build command to stop JVM
jvm_sys_exit_obj = spark._jvm.System.exit
jvm_sys_exit_command = jvm_sys_exit_obj.command_header
jvm_sys_exit_args_command = jvm_sys_exit_obj._build_args(0)[0]
command_to_exit_driver_jvm_process = CALL_COMMAND_NAME +
jvm_sys_exit_command + jvm_sys_exit_args_command + END_COMMAND_PART
gateway_connection = jvm_sys_exit_obj.gateway_client._get_connection()
gateway_socket = gateway_connection.socket
# execute it
gateway_socket.sendall(command_to_exit_driver_jvm_process.encode("utf-8"))
# close gateway sockets on Python side
SparkContext._gateway.shutdown()
# reset globals to initial state
SparkContext._next_accum_id = 0
SparkContext._active_spark_context = None
SparkContext._lock = RLock()
SparkContext._jvm = None
SparkContext._gateway = None
SparkContext._python_includes = None
{code}
Calling {{stop_spark_session(spark)}} stops JVM and allows users to create
fresh new Spark session using PySpark. No config pollution.
Can something like this be added to {{SparkSession.stop()}} implementation?
Only if py4j is used to start up the session, of course.
was:
{code:python}
from pyspark.sql import SparkSession
spark = SparkSession.builder.config("spark.driver.memory",
"2g").config("spark.another.property", "hi").getOrCreate()
spark.conf.get("spark.driver.memory")
# prints '2g'
spark.conf.get("spark.another.property")
# prints 'hi'
# check for JVM process before and after stop
spark.stop()
# try to recreate Spark session with different driver memory, and no
"spark.another.property" at all
spark = SparkSession.builder.config("spark.driver.memory", "3g").getOrCreate()
spark.conf.get("spark.driver.memory")
# prints '3g'
spark.conf.get("spark.another.property")
# prints 'hi'
# check for JVM process
{code}
After first call of {{.getOrCreate()}} JVM process with following options have
been started:
{code}
maxim 76625 10.9 2.7 7975292 447068 pts/8 Sl+ 16:59 0:11
/home/maxim/.sdkman/candidates/java/current/bin/java -cp
/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/pyspark/conf:/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/pyspark/jars/*
-Xmx2g -XX:+IgnoreUnrecognizedVMOptions
--add-opens=java.base/java.lang=ALL-UNNAMED
--add-opens=java.base/java.lang.invoke=ALL-UNNAMED
--add-opens=java.base/java.lang.reflect=ALL-UNNAMED
--add-opens=java.base/java.io=ALL-UNNAMED
--add-opens=java.base/java.net=ALL-UNNAMED
--add-opens=java.base/java.nio=ALL-UNNAMED
--add-opens=java.base/java.util=ALL-UNNAMED
--add-opens=java.base/java.util.concurrent=ALL-UNNAMED
--add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED
--add-opens=java.base/sun.nio.ch=ALL-UNNAMED
--add-opens=java.base/sun.nio.cs=ALL-UNNAMED
--add-opens=java.base/sun.security.action=ALL-UNNAMED
--add-opens=java.base/sun.util.calendar=ALL-UNNAMED
--add-opens=java.security.jgss/sun.security.krb5=ALL-UNNAMED
-Djdk.reflect.useDirectMethodHandle=false org.apache.spark.deploy.SparkSubmit
--conf spark.driver.memory=2g --conf spark.another.property=hi pyspark-shell
{code}
But it have not been stopped by {{.stop()}} method call. New Spark session
which reports 3Gb of driver memory actually uses the same 2Gb, and config
options from old session which should be closed at this moment.
Summarizing:
* {{spark.stop()}} stops only SparkContext, but not JVM
* {{spark.stop()}} does not clean up session config
This behavior has been observed for a long time, at least since 2.2.0, and
still present in 3.5.1.
This could be solved by stopping JVM after Spark session is stopped.
But just calling {{spark._jvm.System.exit(0)}} fill fail because py4j socket
will be closed, and it will be impossible to start new Spark session:
{code:python}
spark._jvm.System.exit(0)
{code}
{code}
ERROR:root:Exception while sending command.
Traceback (most recent call last):
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/clientserver.py",
line 516, in send_command
raise Py4JNetworkError("Answer from Java side is empty")
py4j.protocol.Py4JNetworkError: Answer from Java side is empty
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/java_gateway.py",
line 1038, in send_command
response = connection.send_command(command)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/clientserver.py",
line 539, in send_command
raise Py4JNetworkError(
py4j.protocol.Py4JNetworkError: Error while sending or receiving
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/java_gateway.py",
line 1322, in __call__
return_value = get_return_value(
^^^^^^^^^^^^^^^^^
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/pyspark/errors/exceptions/captured.py",
line 179, in deco
return f(*a, **kw)
^^^^^^^^^^^
File
"/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/protocol.py",
line 334, in get_return_value
raise Py4JError(
py4j.protocol.Py4JError: An error occurred while calling z:java.lang.System.exit
{code}
Here is a description of a safe way to stop JVM without breaking py4j (in
Russian):
https://habr.com/ru/companies/sberbank/articles/805285/
{code:python}
from pyspark.sql import SparkSession
from pyspark import SparkContext
from threading import RLock
from py4j.protocol import CALL_COMMAND_NAME, END_COMMAND_PART
from pyspark.sql import SparkSession
from pyspark import SparkContext
from threading import RLock
from py4j.protocol import CALL_COMMAND_NAME, END_COMMAND_PART
def stop_spark_session(spark_session: SparkSession):
# stop spark session as usual
spark.stop()
# build command to stop JVM
jvm_sys_exit_obj = spark._jvm.System.exit
jvm_sys_exit_command = jvm_sys_exit_obj.command_header
jvm_sys_exit_args_command = jvm_sys_exit_obj._build_args(0)[0]
command_to_exit_driver_jvm_process = CALL_COMMAND_NAME +
jvm_sys_exit_command + jvm_sys_exit_args_command + END_COMMAND_PART
gateway_connection = jvm_sys_exit_obj.gateway_client._get_connection()
gateway_socket = gateway_connection.socket
# execute it
gateway_socket.sendall(command_to_exit_driver_jvm_process.encode("utf-8"))
# close gateway sockets on Python side
SparkContext._gateway.shutdown()
# reset globals to initial state
SparkContext._next_accum_id = 0
SparkContext._active_spark_context = None
SparkContext._lock = RLock()
SparkContext._jvm = None
SparkContext._gateway = None
SparkContext._python_includes = None
{code}
Calling {{stop_spark_session(spark)}} stops JVM and allows users to create
fresh new Spark session using PySpark. No config pollution.
Can something like this be added to {{SparkSession.stop()}} implementation?
Only if py4j is used to start up the session, of course.
> Stop JVM by calling SparkSession.stop from PySpark
> --------------------------------------------------
>
> Key: SPARK-47740
> URL: https://issues.apache.org/jira/browse/SPARK-47740
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Affects Versions: 3.5.1
> Reporter: Maxim Martynov
> Priority: Major
>
> {code:python}
> from pyspark.sql import SparkSession
> spark = SparkSession.builder.config("spark.driver.memory",
> "2g").config("spark.another.property", "hi").getOrCreate()
> spark.conf.get("spark.driver.memory")
> # prints '2g'
> spark.conf.get("spark.another.property")
> # prints 'hi'
> # check for JVM process before and after stop
> spark.stop()
> # try to recreate Spark session with different driver memory, and no
> "spark.another.property" at all
> spark = SparkSession.builder.config("spark.driver.memory", "3g").getOrCreate()
> spark.conf.get("spark.driver.memory")
> # prints '3g'
> spark.conf.get("spark.another.property")
> # prints 'hi'
> # check for JVM process
> {code}
> After first call of {{.getOrCreate()}} JVM process with following options
> have been started:
> {code}
> maxim 76625 10.9 2.7 7975292 447068 pts/8 Sl+ 16:59 0:11
> /home/maxim/.sdkman/candidates/java/current/bin/java -cp
> /home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/pyspark/conf:/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/pyspark/jars/*
> -Xmx2g -XX:+IgnoreUnrecognizedVMOptions
> --add-opens=java.base/java.lang=ALL-UNNAMED
> --add-opens=java.base/java.lang.invoke=ALL-UNNAMED
> --add-opens=java.base/java.lang.reflect=ALL-UNNAMED
> --add-opens=java.base/java.io=ALL-UNNAMED
> --add-opens=java.base/java.net=ALL-UNNAMED
> --add-opens=java.base/java.nio=ALL-UNNAMED
> --add-opens=java.base/java.util=ALL-UNNAMED
> --add-opens=java.base/java.util.concurrent=ALL-UNNAMED
> --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED
> --add-opens=java.base/sun.nio.ch=ALL-UNNAMED
> --add-opens=java.base/sun.nio.cs=ALL-UNNAMED
> --add-opens=java.base/sun.security.action=ALL-UNNAMED
> --add-opens=java.base/sun.util.calendar=ALL-UNNAMED
> --add-opens=java.security.jgss/sun.security.krb5=ALL-UNNAMED
> -Djdk.reflect.useDirectMethodHandle=false org.apache.spark.deploy.SparkSubmit
> --conf spark.driver.memory=2g --conf spark.another.property=hi pyspark-shell
> {code}
> But it have not been stopped by {{.stop()}} method call. New Spark session
> which reports 3Gb of driver memory actually uses the same 2Gb, and config
> options from old session which should be closed at this moment.
> Summarizing:
> * {{spark.stop()}} stops only SparkContext, but not JVM
> * {{spark.stop()}} does not clean up session config
> This behavior has been observed for a long time, at least since 2.2.0, and
> still present in 3.5.1.
> This could be solved by stopping JVM after Spark session is stopped.
> But just calling {{spark._jvm.System.exit(0)}} fill fail because py4j socket
> will be closed, and it will be impossible to start new Spark session:
> {code:python}
> spark._jvm.System.exit(0)
> {code}
> {code}
> ERROR:root:Exception while sending command.
> Traceback (most recent call last):
> File
> "/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/clientserver.py",
> line 516, in send_command
> raise Py4JNetworkError("Answer from Java side is empty")
> py4j.protocol.Py4JNetworkError: Answer from Java side is empty
> During handling of the above exception, another exception occurred:
> Traceback (most recent call last):
> File
> "/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/java_gateway.py",
> line 1038, in send_command
> response = connection.send_command(command)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> File
> "/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/clientserver.py",
> line 539, in send_command
> raise Py4JNetworkError(
> py4j.protocol.Py4JNetworkError: Error while sending or receiving
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File
> "/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/java_gateway.py",
> line 1322, in __call__
> return_value = get_return_value(
> ^^^^^^^^^^^^^^^^^
> File
> "/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/pyspark/errors/exceptions/captured.py",
> line 179, in deco
> return f(*a, **kw)
> ^^^^^^^^^^^
> File
> "/home/maxim/Repo/devdocs/DataLineage/0-RnD/marquez/venv/lib/python3.11/site-packages/py4j/protocol.py",
> line 334, in get_return_value
> raise Py4JError(
> py4j.protocol.Py4JError: An error occurred while calling
> z:java.lang.System.exit
> {code}
> Here is an article describing the same issue, and also providing a safe way
> to stop JVM without breaking py4j (in Russian):
> https://habr.com/ru/companies/sberbank/articles/805285/
> {code:python}
> from pyspark.sql import SparkSession
> from pyspark import SparkContext
> from threading import RLock
> from py4j.protocol import CALL_COMMAND_NAME, END_COMMAND_PART
> from pyspark.sql import SparkSession
> from pyspark import SparkContext
> from threading import RLock
> from py4j.protocol import CALL_COMMAND_NAME, END_COMMAND_PART
> def stop_spark_session(spark_session: SparkSession):
> # stop spark session as usual
> spark.stop()
> # build command to stop JVM
> jvm_sys_exit_obj = spark._jvm.System.exit
> jvm_sys_exit_command = jvm_sys_exit_obj.command_header
> jvm_sys_exit_args_command = jvm_sys_exit_obj._build_args(0)[0]
> command_to_exit_driver_jvm_process = CALL_COMMAND_NAME +
> jvm_sys_exit_command + jvm_sys_exit_args_command + END_COMMAND_PART
> gateway_connection = jvm_sys_exit_obj.gateway_client._get_connection()
> gateway_socket = gateway_connection.socket
> # execute it
> gateway_socket.sendall(command_to_exit_driver_jvm_process.encode("utf-8"))
> # close gateway sockets on Python side
> SparkContext._gateway.shutdown()
> # reset globals to initial state
> SparkContext._next_accum_id = 0
> SparkContext._active_spark_context = None
> SparkContext._lock = RLock()
> SparkContext._jvm = None
> SparkContext._gateway = None
> SparkContext._python_includes = None
> {code}
> Calling {{stop_spark_session(spark)}} stops JVM and allows users to create
> fresh new Spark session using PySpark. No config pollution.
> Can something like this be added to {{SparkSession.stop()}} implementation?
> Only if py4j is used to start up the session, of course.
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