add missing file

joblibspark/utils.py

@@ -0,0 +1,58 @@
+#
+# 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.
+#
+"""
+The utils functions for joblib spark backend.
+"""
+from packaging.version import Version
+import pyspark
+
+
+# pylint: disable=import-outside-toplevel
+def get_spark_session():
+    """
+    Get the spark session from the active session or create a new one.
+    """
+    from pyspark.sql import SparkSession
+
+    spark_session = SparkSession.getActiveSession()
+    if spark_session is None:
+        spark_session = SparkSession \
+            .builder \
+            .appName("JoblibSparkBackend") \
+            .getOrCreate()
+    return spark_session
+
+
+def create_resource_profile(num_cpus_per_spark_task, num_gpus_per_spark_task):
+    """
+    Create a resource profile for the task.
+    :param num_cpus_per_spark_task: Number of cpus for each Spark task of current spark job stage.
+    :param num_gpus_per_spark_task: Number of gpus for each Spark task of current spark job stage.
+    :return: Spark ResourceProfile
+    """
+    resource_profile = None
+    if Version(pyspark.__version__).release >= (3, 4, 0):
+        try:
+            from pyspark.resource.profile import ResourceProfileBuilder
+            from pyspark.resource.requests import TaskResourceRequests
+        except ImportError:
+            pass
+        task_res_req = TaskResourceRequests().cpus(num_cpus_per_spark_task)
+        if num_gpus_per_spark_task > 0:
+            task_res_req = task_res_req.resource("gpu", num_gpus_per_spark_task)
+        resource_profile = ResourceProfileBuilder().require(task_res_req).build
+    return resource_profile