[Flink] disable operator chaining in validatesRunner

Author: jto

runners/flink/flink_runner.gradle

@@ -266,6 +266,8 @@ def createValidatesRunnerTask(Map m) {
     )
     // maxParallelForks decreased from 4 in order to avoid OOM errors
     maxParallelForks 2
+    def flinkConfDir = System.getProperty("user.dir") + "/runners/flink/src/test/validatesRunnerConfig"
+    environment("FLINK_CONF_DIR", flinkConfDir)
     useJUnit {
       if (config.checkpointing) {
         includeCategories 'org.apache.beam.sdk.testing.UsesBundleFinalizer'

runners/flink/src/test/validatesRunnerConfig/flink-conf.yaml

@@ -0,0 +1,22 @@
+# 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.
+#
+
+#parallelism.default: 23
+taskmanager.memory.network.fraction: 0.2
+taskmanager.memory.network.max: 1gb
+pipeline.operator-chaining.enabled: false