Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/16272#discussion_r92530788
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingQueryWrapper.scala
---
@@ -0,0 +1,113 @@
+/*
+ * 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.
+ */
+package org.apache.spark.sql.execution.streaming
+
+import java.util.UUID
+
+import org.apache.spark.sql.SparkSession
+import org.apache.spark.sql.streaming.{StreamingQuery,
StreamingQueryException, StreamingQueryProgress, StreamingQueryStatus}
+
+/**
+ * Wrap non-serializable StreamExecution to make the query serializable as
it's easy to for it to
+ * get captured with normal usage. It's safe to capture the query but not
use it in executors.
+ * However, if the user tries to call its methods, it will throw
`IllegalStateException`.
+ */
+class StreamingQueryWrapper(
+ @transient val streamingQuery: StreamExecution) extends StreamingQuery
with Serializable {
--- End diff --
streamingQuery -> @transient private val _streamExecution
def streamExecution: StreamExecution = {
if (_streamExecution == null) {
throw new IllegalStateException("StreamingQuery cannot be used in
executors")
}
_streamExecution
}
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