[
https://issues.apache.org/jira/browse/SPARK-35009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Attila Zsolt Piros resolved SPARK-35009.
----------------------------------------
Fix Version/s: 3.2.0
Resolution: Fixed
Issue resolved by pull request 32169
[https://github.com/apache/spark/pull/32169]
> Avoid creating multiple Monitor threads for reused python workers for the
> same TaskContext
> ------------------------------------------------------------------------------------------
>
> Key: SPARK-35009
> URL: https://issues.apache.org/jira/browse/SPARK-35009
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 3.0.3, 3.1.0, 3.1.1, 3.1.2, 3.2.0
> Reporter: Attila Zsolt Piros
> Assignee: Attila Zsolt Piros
> Priority: Major
> Fix For: 3.2.0
>
>
> Currently this code will stop because of the high number of created threads:
> {noformat}
> import pyspark
> conf=pyspark.SparkConf().setMaster("local[64]").setAppName("Test1")
> sc=pyspark.SparkContext.getOrCreate(conf)
> rows=70000
> data=list(range(rows))
> rdd=sc.parallelize(data,rows)
> assert rdd.getNumPartitions()==rows
> rdd0=rdd.filter(lambda x:False)
> assert rdd0.getNumPartitions()==rows
> rdd00=rdd0.coalesce(1)
> data=rdd00.collect()
> assert data==[]
> {noformat}
> The error is:
> {noformat}
> 1/04/08 12:12:26 WARN NativeCodeLoader: Unable to load native-hadoop library
> for your platform... using builtin-java classes where applicable
> 21/04/08 12:12:29 WARN TaskSetManager: Stage 0 contains a task of very large
> size (4732 KiB). The maximum recommended task size is 1000 KiB.
> [Stage 0:> (0 + 1) /
> 1][423.190s][warning][os,thread] Attempt to protect stack guard pages failed
> (0x00007f43d23ff000-0x00007f43d2403000).
> [423.190s][warning][os,thread] Attempt to deallocate stack guard pages failed.
> OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00007f43d300b000,
> 16384, 0) failed; error='Not enough space' (errno=12)
> [423.231s][warning][os,thread] Failed to start thread - pthread_create failed
> (EAGAIN) for attributes: stacksize: 1024k, guardsize: 0k, detached.
> #
> # There is insufficient memory for the Java Runtime Environment to continue.
> # Native memory allocation (mmap) failed to map 16384 bytes for committing
> reserved memory.
> # An error report file with more information is saved as:
> # /home/ubuntu/PycharmProjects/<projekt-dir>/tests/hs_err_pid17755.log
> [thread 17966 also had an error]
> OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00007f4b7bd81000,
> 262144, 0) failed; error='Not enough space' (errno=12)
> ERROR:root:Exception while sending command.
> Traceback (most recent call last):
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 1207, 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 "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 1033, in send_command
> response = connection.send_command(command)
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 1211, in send_command
> raise Py4JNetworkError(
> py4j.protocol.Py4JNetworkError: Error while receiving
> ERROR:py4j.java_gateway:An error occurred while trying to connect to the Java
> server (127.0.0.1:42439)
> Traceback (most recent call last):
> File "/opt/spark/python/pyspark/rdd.py", line 889, in collect
> sock_info = self.ctx._jvm.PythonRDD.collectAndServe(self._jrdd.rdd())
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 1304, in __call__
> return_value = get_return_value(
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/protocol.py", line
> 334, in get_return_value
> raise Py4JError(
> py4j.protocol.Py4JError: An error occurred while calling
> z:org.apache.spark.api.python.PythonRDD.collectAndServe
> During handling of the above exception, another exception occurred:
> Traceback (most recent call last):
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 977, in _get_connection
> connection = self.deque.pop()
> IndexError: pop from an empty deque
> During handling of the above exception, another exception occurred:
> Traceback (most recent call last):
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 1115, in start
> self.socket.connect((self.address, self.port))
> ConnectionRefusedError: [Errno 111] Connection refused
> Traceback (most recent call last):
> File "/opt/spark/python/pyspark/rdd.py", line 889, in collect
> sock_info = self.ctx._jvm.PythonRDD.collectAndServe(self._jrdd.rdd())
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 1304, in __call__
> return_value = get_return_value(
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/protocol.py", line
> 334, in get_return_value
> raise Py4JError(
> py4j.protocol.Py4JError: An error occurred while calling
> z:org.apache.spark.api.python.PythonRDD.collectAndServe
> During handling of the above exception, another exception occurred:
> Traceback (most recent call last):
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 977, in _get_connection
> connection = self.deque.pop()
> IndexError: pop from an empty deque
> During handling of the above exception, another exception occurred:
> Traceback (most recent call last):
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 1115, in start
> self.socket.connect((self.address, self.port))
> ConnectionRefusedError: [Errno 111] Connection refused
> During handling of the above exception, another exception occurred:
> Traceback (most recent call last):
> File "<input>", line 3, in <module>
> File
> "/opt/pycharm-2020.2.3/plugins/python/helpers/pydev/_pydev_bundle/pydev_umd.py",
> line 197, in runfile
> pydev_imports.execfile(filename, global_vars, local_vars) # execute the
> script
> File
> "/opt/pycharm-2020.2.3/plugins/python/helpers/pydev/_pydev_imps/_pydev_execfile.py",
> line 18, in execfile
> exec(compile(contents+"\n", file, 'exec'), glob, loc)
> File
> "/home/ubuntu/PycharmProjects/SPO_as_a_Service/tests/test_modeling_paf.py",
> line 992, in <module>
> test_70000()
> File
> "/home/ubuntu/PycharmProjects/SPO_as_a_Service/tests/test_modeling_paf.py",
> line 974, in test_70000
> data=rdd00.collect()
> File "/opt/spark/python/pyspark/rdd.py", line 889, in collect
> sock_info = self.ctx._jvm.PythonRDD.collectAndServe(self._jrdd.rdd())
> File "/opt/spark/python/pyspark/traceback_utils.py", line 78, in __exit__
> self._context._jsc.setCallSite(None)
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 1303, in __call__
> answer = self.gateway_client.send_command(command)
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 1031, in send_command
> connection = self._get_connection()
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 979, in _get_connection
> connection = self._create_connection()
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 985, in _create_connection
> connection.start()
> File "/opt/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py", line
> 1127, in start
> raise Py4JNetworkError(msg, e)
> py4j.protocol.Py4JNetworkError: An error occurred while trying to connect to
> the Java server (127.0.0.1:42439)
> {noformat}
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