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From GitBox <...@apache.org>
Subject [GitHub] [datafu] rjurney commented on a change in pull request #15: Add Spark functionality to DataFu, datafu-spark
Date Sun, 14 Jul 2019 15:04:37 GMT
rjurney commented on a change in pull request #15: Add Spark functionality to DataFu, datafu-spark
URL: https://github.com/apache/datafu/pull/15#discussion_r303248340
 
 

 ##########
 File path: datafu-spark/src/main/resources/pyspark_utils/bridge_utils.py
 ##########
 @@ -0,0 +1,72 @@
+# 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.
+
+import os
+
+from py4j.java_gateway import JavaGateway, GatewayClient
+from pyspark.conf import SparkConf
+from pyspark.context import SparkContext
+from pyspark.sql import SparkSession
+
+# use jvm gateway to create a java class instance by full-qualified class name
+def _getjvm_class(gateway, fullClassName):
+    return gateway.jvm.java.lang.Thread.currentThread().getContextClassLoader().loadClass(fullClassName).newInstance()
+
+
+class Context(object):
+
+    def __init__(self):
+        from py4j.java_gateway import java_import
+        """When running a Python script from Scala - this function is called
+        by the script to initialize the connection to the Java Gateway and get the spark
context.
+        code is basically copied from: 
+         https://github.com/apache/zeppelin/blob/master/spark/interpreter/src/main/resources/python/zeppelin_pyspark.py#L30
 
 Review comment:
   url is uneven with rest of comment. Should it be even?

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