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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7040) Flip-6 client-cluster communication
Date Tue, 22 Aug 2017 15:08:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16136912#comment-16136912

ASF GitHub Bot commented on FLINK-7040:

Github user zentol commented on a diff in the pull request:

    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/HandlerResponse.java
    @@ -0,0 +1,121 @@
    + * 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.rest.handler;
    +import org.apache.flink.runtime.rest.messages.ResponseBody;
    +import org.apache.flink.util.Preconditions;
    +import org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponseStatus;
    +import javax.annotation.Nonnull;
    + * Simple container for the response of a handler, that contains either a response of
type {@code P} if the incoming
    + * request was handled successfully, otherwise it contains an error message and an associated
error code.
    + *
    + * @param <P> type of successful response
    + */
    +public final class HandlerResponse<P extends ResponseBody> {
    --- End diff --
    But even if we split this interface a user that gets a `HandlerResponse` still has to
do the same checks as to whether it was successful or not. Unless you suggest to have an empty
`HandlerResponse` interface and force users to do an instanceof+cast every time.

> Flip-6 client-cluster communication
> -----------------------------------
>                 Key: FLINK-7040
>                 URL: https://issues.apache.org/jira/browse/FLINK-7040
>             Project: Flink
>          Issue Type: New Feature
>          Components: Cluster Management, Mesos
>            Reporter: Till Rohrmann
>            Assignee: Chesnay Schepler
>            Priority: Critical
>              Labels: flip-6
> With the new Flip-6 architecture, the client will communicate with the cluster in a RESTful
> The cluster shall support the following REST calls:
> * List jobs (GET): Get list of all running jobs on the cluster
> * Submit job (POST): Submit a job to the cluster (only supported in session mode)
> * Lookup job leader (GET): Gets the JM leader for the given job
> * Get job status (GET): Get the status of an executed job (and maybe the JobExecutionResult)
> * Cancel job (PUT): Cancel the given job
> * Stop job (PUT): Stops the given job
> * Take savepoint (POST): Take savepoint for given job (How to return the savepoint under
which the savepoint was stored? Maybe always having to specify a path)
> * Get KV state (GET): Gets the KV state for the given job and key (Queryable state)
> * Poll/subscribe to notifications for job (GET, WebSocket): Polls new notifications from
the execution of the given job/Opens WebSocket to receive notifications
> The first four REST calls will be served by the REST endpoint running in the application
master/cluster entrypoint. The other calls will be served by a REST endpoint running along
side to the JobManager.
> Detailed information about different implementations and their pros and cons can be found
in this document:
> https://docs.google.com/document/d/1eIX6FS9stwraRdSUgRSuLXC1sL7NAmxtuqIXe_jSi-k/edit?usp=sharing
> The implementation will most likely be Netty based.

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