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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7406) Implement Netty receiver incoming pipeline for credit-based
Date Wed, 27 Sep 2017 09:44:01 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182263#comment-16182263

ASF GitHub Bot commented on FLINK-7406:

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

    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/CreditBasedClientHandler.java
    @@ -0,0 +1,283 @@
    + * 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.io.network.netty;
    +import org.apache.flink.core.memory.MemorySegment;
    +import org.apache.flink.core.memory.MemorySegmentFactory;
    +import org.apache.flink.runtime.io.network.buffer.Buffer;
    +import org.apache.flink.runtime.io.network.buffer.FreeingBufferRecycler;
    +import org.apache.flink.runtime.io.network.netty.exception.LocalTransportException;
    +import org.apache.flink.runtime.io.network.netty.exception.RemoteTransportException;
    +import org.apache.flink.runtime.io.network.netty.exception.TransportException;
    +import org.apache.flink.runtime.io.network.partition.PartitionNotFoundException;
    +import org.apache.flink.runtime.io.network.partition.consumer.InputChannelID;
    +import org.apache.flink.runtime.io.network.partition.consumer.RemoteInputChannel;
    +import org.apache.flink.shaded.guava18.com.google.common.collect.Maps;
    +import org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext;
    +import org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +import java.io.IOException;
    +import java.net.SocketAddress;
    +import java.util.concurrent.ConcurrentHashMap;
    +import java.util.concurrent.ConcurrentMap;
    +import java.util.concurrent.atomic.AtomicReference;
    +class CreditBasedClientHandler extends ChannelInboundHandlerAdapter {
    --- End diff --
    I know, the original `PartitionRequestClientHandler` has not been documented, but could
you please add a small description so that we gradually improve the code style / documentation
in this module?

> Implement Netty receiver incoming pipeline for credit-based
> -----------------------------------------------------------
>                 Key: FLINK-7406
>                 URL: https://issues.apache.org/jira/browse/FLINK-7406
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Network
>            Reporter: zhijiang
>            Assignee: zhijiang
>             Fix For: 1.4.0
> This is a part of work for credit-based network flow control.
> Currently {{PartitionRequestClientHandler}} receives and reads {{BufferResponse}} from
producer. It will request buffer from {{BufferPool}} for holding the message. If not got,
the message is staged temporarily and {{autoread}} for channel is set false.
> For credit-based mode, {{PartitionRequestClientHandler}} can always get buffer from {{RemoteInputChannel}}
for reading messages from producer.
> The related works are:
> * Add the backlog of producer in {{BufferResponse}} message structure
> * {{PartitionRequestClientHandler}} requests buffer from {{RemoteInputChannel}} directly
> * {{PartitionRequestClientHandler}} updates backlog for {{RemoteInputChannel}}, and it
may trigger requests of floating buffers from {{BufferPool}}

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