Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/2915#discussion_r90664759
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/overlays/HadoopUserOverlay.java
---
@@ -0,0 +1,83 @@
+/*
+ * 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.flink.runtime.clusterframework.overlays;
+
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.runtime.clusterframework.ContainerSpecification;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nullable;
+import java.io.IOException;
+
+/**
+ * Overlays a Hadoop user context into a container.
+ *
+ * The overlay essentially configures Hadoop's {@link
UserGroupInformation} class,
+ * establishing the effective username for filesystem calls to HDFS in
non-secure clusters.
+ *
+ * In secure clusters, the configured keytab establishes the effective
user.
+ *
+ * The following environment variables are set in the container:
+ * - HADOOP_USER_NAME
+ */
+public class HadoopUserOverlay implements ContainerOverlay {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(HadoopUserOverlay.class);
+
+ private final UserGroupInformation ugi;
+
+ public HadoopUserOverlay(@Nullable UserGroupInformation ugi) {
+ this.ugi = ugi;
+ }
+
+ @Override
+ public void configure(ContainerSpecification container) throws
IOException {
+ if(ugi != null) {
+ // overlay the Hadoop user identity (w/ tokens)
+
container.getEnvironmentVariables().put("HADOOP_USER_NAME", ugi.getUserName());
+ }
+ }
+
+ public static Builder newBuilder() {
+ return new Builder();
+ }
+
+ /**
+ * A builder for the {@link HadoopUserOverlay}.
+ */
+ public static class Builder {
+
+ UserGroupInformation ugi;
+
+ /**
+ * Configures the overlay using the current Hadoop user
information (from {@link UserGroupInformation}).
+ */
--- End diff --
indention is off here
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
