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https://issues.apache.org/jira/browse/DRILL-5485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16022409#comment-16022409
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ASF GitHub Bot commented on DRILL-5485:
---------------------------------------
Github user sohami commented on a diff in the pull request:
https://github.com/apache/drill/pull/829#discussion_r118160653
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/rpc/UserClientConnection.java
---
@@ -0,0 +1,69 @@
+/*
+ * 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.drill.exec.rpc;
+
+import io.netty.channel.ChannelFuture;
+import org.apache.drill.exec.physical.impl.materialize.QueryWritableBatch;
+import org.apache.drill.exec.proto.GeneralRPCProtos;
+import org.apache.drill.exec.proto.UserBitShared;
+import org.apache.drill.exec.rpc.user.UserSession;
+
+import java.net.SocketAddress;
+
+/**
+ * Interface for getting user session properties and interacting with user
connection. Separating this interface from
+ * {@link AbstractRemoteConnection} implementation for user connection:
+ * <p><ul>
+ * <li> Connection is passed to Foreman and Screen operators. Instead
passing this interface exposes few details.
+ * <li> Makes it easy to have wrappers around user connection which can be
helpful to tap the messages and data
+ * going to the actual client.
+ * </ul>
+ */
+public interface UserClientConnection {
+ /**
+ * @return User session object.
+ */
+ UserSession getSession();
+
+ /**
+ * Send query result outcome to client. Outcome is returned through
<code>listener</code>
+ *
+ * @param listener
+ * @param result
+ */
+ void sendResult(RpcOutcomeListener<GeneralRPCProtos.Ack> listener,
UserBitShared.QueryResult result);
--- End diff --
Fixed.
> Remove WebServer dependency on DrillClient
> ------------------------------------------
>
> Key: DRILL-5485
> URL: https://issues.apache.org/jira/browse/DRILL-5485
> Project: Apache Drill
> Issue Type: Improvement
> Components: Web Server
> Reporter: Sorabh Hamirwasia
> Fix For: 1.11.0
>
>
> With encryption support using SASL, client's won't be able to authenticate
> using PLAIN mechanism when encryption is enabled on the cluster. Today
> WebServer which is embedded inside Drillbit creates a DrillClient instance
> for each WebClient session. And the WebUser is authenticated as part of
> authentication between DrillClient instance and Drillbit using PLAIN
> mechanism. But with encryption enabled this will fail since encryption
> doesn't support authentication using PLAN mechanism, hence no WebClient can
> connect to a Drillbit. There are below issues as well with this approach:
> 1) Since DrillClient is used per WebUser session this is expensive as it has
> heavyweight RPC layer for DrillClient and all it's dependencies.
> 2) If the Foreman for a WebUser is also selected to be a different node then
> there will be extra hop of transferring data back to WebClient.
> To resolve all the above issue it would be better to authenticate the WebUser
> locally using the Drillbit on which WebServer is running without creating
> DrillClient instance. We can use the local PAMAuthenticator to authenticate
> the user. After authentication is successful the local Drillbit can also
> serve as the Foreman for all the queries submitted by WebUser. This can be
> achieved by submitting the query to the local Drillbit Foreman work queue.
> This will also remove the requirement to encrypt the channel opened between
> WebServer (DrillClient) and selected Drillbit since with this approach there
> won't be any physical channel opened between them.
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