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[Dataflow Streaming] Add Channelz staus page exporting GRPC channelz …
…data (#30211) Co-authored-by: Arun Pandian <pandiana@google.com>
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292
...in/java/org/apache/beam/runners/dataflow/worker/windmill/client/grpc/ChannelzServlet.java
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| /* | ||
| * 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.beam.runners.dataflow.worker.windmill.client.grpc; | ||
|
|
||
| import java.io.IOException; | ||
| import java.io.PrintWriter; | ||
| import java.util.ArrayList; | ||
| import java.util.HashSet; | ||
| import java.util.List; | ||
| import java.util.Set; | ||
| import java.util.stream.Collectors; | ||
| import javax.annotation.Nullable; | ||
| import javax.servlet.ServletException; | ||
| import javax.servlet.http.HttpServletRequest; | ||
| import javax.servlet.http.HttpServletResponse; | ||
| import org.apache.beam.runners.dataflow.worker.options.StreamingDataflowWorkerOptions; | ||
| import org.apache.beam.runners.dataflow.worker.status.BaseStatusServlet; | ||
| import org.apache.beam.runners.dataflow.worker.status.DebugCapture; | ||
| import org.apache.beam.runners.dataflow.worker.windmill.WindmillServerStub; | ||
| import org.apache.beam.sdk.annotations.Internal; | ||
| import org.apache.beam.vendor.grpc.v1p60p1.io.grpc.channelz.v1.*; | ||
| import org.apache.beam.vendor.grpc.v1p60p1.io.grpc.protobuf.services.ChannelzService; | ||
| import org.apache.beam.vendor.grpc.v1p60p1.io.grpc.stub.StreamObserver; | ||
| import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableSet; | ||
| import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.net.HostAndPort; | ||
| import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.util.concurrent.SettableFuture; | ||
|
|
||
| /** Respond to /path with the GRPC channelz data. */ | ||
| @Internal | ||
| public class ChannelzServlet extends BaseStatusServlet implements DebugCapture.Capturable { | ||
|
|
||
| private static final int MAX_TOP_CHANNELS_TO_RETURN = 500; | ||
|
|
||
| private final ChannelzService channelzService; | ||
| private final WindmillServerStub windmillServerStub; | ||
| private final boolean showOnlyWindmillServiceChannels; | ||
|
|
||
| public ChannelzServlet( | ||
| String path, StreamingDataflowWorkerOptions options, WindmillServerStub windmillServerStub) { | ||
| super(path); | ||
| channelzService = ChannelzService.newInstance(MAX_TOP_CHANNELS_TO_RETURN); | ||
| this.windmillServerStub = windmillServerStub; | ||
| showOnlyWindmillServiceChannels = options.getChannelzShowOnlyWindmillServiceChannels(); | ||
| } | ||
|
|
||
| @Override | ||
| protected void doGet(HttpServletRequest request, HttpServletResponse response) | ||
| throws IOException, ServletException { | ||
| response.setStatus(HttpServletResponse.SC_OK); | ||
| PrintWriter writer = response.getWriter(); | ||
| captureData(writer); | ||
| } | ||
|
|
||
| @Override | ||
| public String pageName() { | ||
| return getPath(); | ||
| } | ||
|
|
||
| @Override | ||
| public void captureData(PrintWriter writer) { | ||
| writer.println("<html>"); | ||
| writer.println("<h1>Channelz</h1>"); | ||
| appendTopChannels(writer); | ||
| writer.println("</html>"); | ||
| } | ||
|
|
||
| // channelz proto says there won't be cycles in the ref graph. | ||
| // we track visited ids to be defensive and prevent any accidental cycles. | ||
| private static class VisitedSets { | ||
|
|
||
| Set<Long> channels = new HashSet<>(); | ||
| Set<Long> subchannels = new HashSet<>(); | ||
| } | ||
|
|
||
| private void appendTopChannels(PrintWriter writer) { | ||
| SettableFuture<GetTopChannelsResponse> future = SettableFuture.create(); | ||
| // IDEA: If there are more than MAX_TOP_CHANNELS_TO_RETURN top channels | ||
| // in the worker, we might not return all the windmill channels. If we run into | ||
| // such situations, this logic can be modified to loop till we see an empty | ||
| // GetTopChannelsResponse response with the end bit set. | ||
| channelzService.getTopChannels( | ||
| GetTopChannelsRequest.newBuilder().build(), getStreamObserver(future)); | ||
| GetTopChannelsResponse topChannelsResponse; | ||
| try { | ||
| topChannelsResponse = future.get(); | ||
| } catch (Exception e) { | ||
| String msg = "Failed to get channelz: " + e.getMessage(); | ||
| writer.println(msg); | ||
| return; | ||
| } | ||
|
|
||
| List<Channel> topChannels = topChannelsResponse.getChannelList(); | ||
| if (showOnlyWindmillServiceChannels) { | ||
| topChannels = filterWindmillChannels(topChannels); | ||
| } | ||
| writer.println("<h2>Top Level Channels</h2>"); | ||
| writer.println("<table border='1'>"); | ||
| VisitedSets visitedSets = new VisitedSets(); | ||
| for (Channel channel : topChannels) { | ||
| writer.println("<tr>"); | ||
| writer.println("<td>"); | ||
| writer.println("TopChannelId: " + channel.getRef().getChannelId()); | ||
| writer.println("</td>"); | ||
| writer.println("<td>"); | ||
| appendChannel(channel, writer, visitedSets); | ||
| writer.println("</td>"); | ||
| writer.println("</tr>"); | ||
| } | ||
| writer.println("</table>"); | ||
| } | ||
|
|
||
| private List<Channel> filterWindmillChannels(List<Channel> channels) { | ||
| ImmutableSet<HostAndPort> windmillServiceEndpoints = | ||
| windmillServerStub.getWindmillServiceEndpoints(); | ||
| Set<String> windmillServiceHosts = | ||
| windmillServiceEndpoints.stream().map(HostAndPort::getHost).collect(Collectors.toSet()); | ||
| List<Channel> windmillChannels = new ArrayList<>(); | ||
| for (Channel channel : channels) { | ||
| for (String windmillServiceHost : windmillServiceHosts) { | ||
| if (channel.getData().getTarget().contains(windmillServiceHost)) { | ||
| windmillChannels.add(channel); | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| return windmillChannels; | ||
| } | ||
|
|
||
| private void appendChannels( | ||
| List<ChannelRef> channelRefs, PrintWriter writer, VisitedSets visitedSets) { | ||
| for (ChannelRef channelRef : channelRefs) { | ||
| writer.println("<tr>"); | ||
| writer.println("<td>"); | ||
| writer.println("Channel: " + channelRef.getChannelId()); | ||
| writer.println("</td>"); | ||
| writer.println("<td>"); | ||
| appendChannel(channelRef, writer, visitedSets); | ||
| writer.println("</td>"); | ||
| writer.println("</tr>"); | ||
| } | ||
| } | ||
|
|
||
| private void appendChannel(ChannelRef channelRef, PrintWriter writer, VisitedSets visitedSets) { | ||
| if (visitedSets.channels.contains(channelRef.getChannelId())) { | ||
| String msg = "Duplicate Channel Id: " + channelRef; | ||
| writer.println(msg); | ||
| return; | ||
| } | ||
| visitedSets.channels.add(channelRef.getChannelId()); | ||
| SettableFuture<GetChannelResponse> future = SettableFuture.create(); | ||
| channelzService.getChannel( | ||
| GetChannelRequest.newBuilder().setChannelId(channelRef.getChannelId()).build(), | ||
| getStreamObserver(future)); | ||
| Channel channel; | ||
| try { | ||
| channel = future.get().getChannel(); | ||
| } catch (Exception e) { | ||
| String msg = "Failed to get Channel: " + channelRef; | ||
| writer.println(msg + " Exception: " + e.getMessage()); | ||
| return; | ||
| } | ||
| appendChannel(channel, writer, visitedSets); | ||
| } | ||
|
|
||
| private void appendChannel(Channel channel, PrintWriter writer, VisitedSets visitedSets) { | ||
| writer.println("<table border='1'>"); | ||
| writer.println("<tr>"); | ||
| writer.println("<td>"); | ||
| writer.println("ChannelId: " + channel.getRef().getChannelId()); | ||
| writer.println("</td>"); | ||
| writer.println("<td><pre>" + channel); | ||
| writer.println("</pre></td>"); | ||
| writer.println("</tr>"); | ||
| appendChannels(channel.getChannelRefList(), writer, visitedSets); | ||
| appendSubChannels(channel.getSubchannelRefList(), writer, visitedSets); | ||
| appendSockets(channel.getSocketRefList(), writer); | ||
| writer.println("</table>"); | ||
| } | ||
|
|
||
| private void appendSubChannels( | ||
| List<SubchannelRef> subchannelRefList, PrintWriter writer, VisitedSets visitedSets) { | ||
| for (SubchannelRef subchannelRef : subchannelRefList) { | ||
| writer.println("<tr>"); | ||
| writer.println("<td>"); | ||
| writer.println("Sub Channel: " + subchannelRef.getSubchannelId()); | ||
| writer.println("</td>"); | ||
| writer.println("<td>"); | ||
| appendSubchannel(subchannelRef, writer, visitedSets); | ||
| writer.println("</td>"); | ||
| writer.println("</tr>"); | ||
| } | ||
| } | ||
|
|
||
| private void appendSubchannel( | ||
| SubchannelRef subchannelRef, PrintWriter writer, VisitedSets visitedSets) { | ||
| if (visitedSets.subchannels.contains(subchannelRef.getSubchannelId())) { | ||
| String msg = "Duplicate Subchannel Id: " + subchannelRef; | ||
| writer.println(msg); | ||
| return; | ||
| } | ||
| visitedSets.subchannels.add(subchannelRef.getSubchannelId()); | ||
| SettableFuture<GetSubchannelResponse> future = SettableFuture.create(); | ||
| channelzService.getSubchannel( | ||
| GetSubchannelRequest.newBuilder().setSubchannelId(subchannelRef.getSubchannelId()).build(), | ||
| getStreamObserver(future)); | ||
| Subchannel subchannel; | ||
| try { | ||
| subchannel = future.get().getSubchannel(); | ||
| } catch (Exception e) { | ||
| String msg = "Failed to get Subchannel: " + subchannelRef; | ||
| writer.println(msg + " Exception: " + e.getMessage()); | ||
| return; | ||
| } | ||
|
|
||
| writer.println("<table border='1'>"); | ||
| writer.println("<tr>"); | ||
| writer.println("<td>SubchannelId: " + subchannelRef.getSubchannelId()); | ||
| writer.println("</td>"); | ||
| writer.println("<td><pre>" + subchannel.toString()); | ||
| writer.println("</pre></td>"); | ||
| writer.println("</tr>"); | ||
| appendChannels(subchannel.getChannelRefList(), writer, visitedSets); | ||
| appendSubChannels(subchannel.getSubchannelRefList(), writer, visitedSets); | ||
| appendSockets(subchannel.getSocketRefList(), writer); | ||
| writer.println("</table>"); | ||
| } | ||
|
|
||
| private void appendSockets(List<SocketRef> socketRefList, PrintWriter writer) { | ||
| for (SocketRef socketRef : socketRefList) { | ||
| writer.println("<tr>"); | ||
| writer.println("<td>"); | ||
| writer.println("Socket: " + socketRef.getSocketId()); | ||
| writer.println("</td>"); | ||
| writer.println("<td>"); | ||
| appendSocket(socketRef, writer); | ||
| writer.println("</td>"); | ||
| writer.println("</tr>"); | ||
| } | ||
| } | ||
|
|
||
| private void appendSocket(SocketRef socketRef, PrintWriter writer) { | ||
| SettableFuture<GetSocketResponse> future = SettableFuture.create(); | ||
| channelzService.getSocket( | ||
| GetSocketRequest.newBuilder().setSocketId(socketRef.getSocketId()).build(), | ||
| getStreamObserver(future)); | ||
| Socket socket; | ||
| try { | ||
| socket = future.get().getSocket(); | ||
| } catch (Exception e) { | ||
| String msg = "Failed to get Socket: " + socketRef; | ||
| writer.println(msg + " Exception: " + e.getMessage()); | ||
| return; | ||
| } | ||
| writer.println("<pre>" + socket + "</pre>"); | ||
| } | ||
|
|
||
| private <T> StreamObserver<T> getStreamObserver(SettableFuture<T> future) { | ||
| return new StreamObserver<T>() { | ||
| @Nullable T response = null; | ||
|
|
||
| @Override | ||
| public void onNext(T message) { | ||
| response = message; | ||
| } | ||
|
|
||
| @Override | ||
| public void onError(Throwable throwable) { | ||
| future.setException(throwable); | ||
| } | ||
|
|
||
| @Override | ||
| public void onCompleted() { | ||
| future.set(response); | ||
| } | ||
| }; | ||
| } | ||
| } |
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