Attila Zsolt Piros created SPARK-35009: ------------------------------------------
Summary: 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: 3.1.1, 3.1.0, 3.2.0, 3.1.2, 3.0.3, 3.12 Reporter: Attila Zsolt Piros Assignee: Attila Zsolt Piros 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} -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org