Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1790#discussion_r56180094
--- Diff:
flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/handlers/TaskManagerLogHandler.java
---
@@ -0,0 +1,345 @@
+/*
+ * 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.webmonitor.handlers;
+
+/*****************************************************************************
+ * This code is based on the "HttpStaticFileServerHandler" from the
+ * Netty project's HTTP server example.
+ *
+ * See http://netty.io and
+ *
https://github.com/netty/netty/blob/4.0/example/src/main/java/io/netty/example/http/file/HttpStaticFileServerHandler.java
+
*****************************************************************************/
+
+import akka.dispatch.OnComplete;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.DefaultFileRegion;
+import io.netty.channel.SimpleChannelInboundHandler;
+import io.netty.handler.codec.http.DefaultFullHttpResponse;
+import io.netty.handler.codec.http.DefaultHttpResponse;
+import io.netty.handler.codec.http.FullHttpResponse;
+import io.netty.handler.codec.http.HttpHeaders;
+import io.netty.handler.codec.http.HttpRequest;
+import io.netty.handler.codec.http.HttpResponse;
+import io.netty.handler.codec.http.HttpResponseStatus;
+import io.netty.handler.codec.http.LastHttpContent;
+import io.netty.handler.codec.http.router.KeepAliveWrite;
+import io.netty.handler.codec.http.router.Routed;
+import io.netty.util.CharsetUtil;
+import io.netty.util.concurrent.GenericFutureListener;
+import org.apache.flink.runtime.blob.BlobKey;
+import org.apache.flink.runtime.instance.ActorGateway;
+import org.apache.flink.runtime.instance.Instance;
+import org.apache.flink.runtime.instance.InstanceID;
+import org.apache.flink.runtime.messages.JobManagerMessages;
+import org.apache.flink.runtime.messages.TaskManagerMessages;
+import org.apache.flink.runtime.webmonitor.JobManagerRetriever;
+import org.apache.flink.runtime.webmonitor.files.MimeTypes;
+import org.apache.flink.runtime.webmonitor.files.StaticFileServerHandler;
+import org.apache.flink.util.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import scala.Option;
+import scala.Tuple2;
+import scala.concurrent.Await;
+import scala.concurrent.ExecutionContextExecutor;
+import scala.concurrent.Future;
+import scala.concurrent.duration.FiniteDuration;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.util.HashMap;
+import java.util.Map;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;
+import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
+import static
io.netty.handler.codec.http.HttpResponseStatus.INTERNAL_SERVER_ERROR;
+import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
+import static io.netty.handler.codec.http.HttpResponseStatus.OK;
+import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
+
+/**
+ * Request handler that returns the TaskManager log/out files.
+ *
+ * <p>This code is based on the "HttpStaticFileServerHandler" from the
Netty project's HTTP server
+ * example.</p>
+ */
+@ChannelHandler.Sharable
+public class TaskManagerLogHandler extends
SimpleChannelInboundHandler<Routed> {
+
+ /** Default logger, if none is specified */
+ private static final Logger DEFAULT_LOGGER =
LoggerFactory.getLogger(StaticFileServerHandler.class);
+
+ //
------------------------------------------------------------------------
+
+ /** JobManager retriever */
+ private final JobManagerRetriever retriever;
+
+ private final Future<String> localJobManagerAddressFuture;
+
+ private final FiniteDuration timeout;
+
+ /** Keep track of last transmitted log, to clean up old ones */
+ private final HashMap<String, BlobKey> lastSubmittedLog = new
HashMap<>();
+ private final HashMap<String, BlobKey> lastSubmittedStdout = new
HashMap<>();
+
+ /** Keep track of request status, prevents multiple log requests for a
single TM running concurrently */
+ private final HashMap<String, Boolean> lastRequestCompleted = new
HashMap<>();
+
+ /** The log for all error reporting */
+ private final Logger logger;
+
+ /** indicates which log file should be displayed; true indicates .log,
false indicates .out */
+ private final boolean serveLogFile;
+ private final ExecutionContextExecutor executor;
+
+ private String localJobManagerAddress;
+
+ public TaskManagerLogHandler(
+ JobManagerRetriever retriever,
+ ExecutionContextExecutor executor,
+ Future<String> localJobManagerAddressPromise,
+ FiniteDuration timeout,
+ boolean serveLogFile) throws IOException {
+
+ this(retriever, executor, localJobManagerAddressPromise,
timeout, DEFAULT_LOGGER, serveLogFile);
+ }
+
+ public TaskManagerLogHandler(
+ JobManagerRetriever retriever,
+ ExecutionContextExecutor executor,
+ Future<String> localJobManagerAddressFuture,
+ FiniteDuration timeout,
+ Logger logger, boolean serveLogFile) throws IOException {
+
+ this.retriever = checkNotNull(retriever);
+ this.executor = checkNotNull(executor);
+ this.localJobManagerAddressFuture =
checkNotNull(localJobManagerAddressFuture);
+ this.timeout = checkNotNull(timeout);
+ this.logger = checkNotNull(logger);
+ this.serveLogFile = serveLogFile;
+ }
+
+ //
------------------------------------------------------------------------
+ // Responses to requests
+ //
------------------------------------------------------------------------
+
+ @Override
+ public void channelRead0(ChannelHandlerContext ctx, Routed routed)
throws Exception {
+ if (localJobManagerAddressFuture.isCompleted()) {
+ if (localJobManagerAddress == null) {
+ localJobManagerAddress =
Await.result(localJobManagerAddressFuture, timeout);
+ }
+
+ final HttpRequest request = routed.request();
+
+ Option<Tuple2<ActorGateway, Integer>> jobManager =
retriever.getJobManagerGatewayAndWebPort();
+
+ if (jobManager.isDefined()) {
+ // Redirect to leader if necessary
+ String redirectAddress =
HandlerRedirectUtils.getRedirectAddress(
+ localJobManagerAddress,
jobManager.get());
+
+ if (redirectAddress != null) {
+ HttpResponse redirect =
HandlerRedirectUtils.getRedirectResponse(redirectAddress, "");
+ KeepAliveWrite.flush(ctx,
routed.request(), redirect);
+ } else {
+ respondAsLeader(ctx, request,
routed.pathParams(), jobManager.get()._1());
+ }
+ } else {
+ KeepAliveWrite.flush(ctx, routed.request(),
HandlerRedirectUtils.getUnavailableResponse());
+ }
+ } else {
+ KeepAliveWrite.flush(ctx, routed.request(),
HandlerRedirectUtils.getUnavailableResponse());
+ }
+ }
+
+ /**
+ * Response when running with leading JobManager.
+ */
+ private void respondAsLeader(final ChannelHandlerContext ctx, final
HttpRequest request, final Map<String, String> pathParams, final ActorGateway
jobManager) throws Exception {
+ final String taskManagerID =
pathParams.get(TaskManagersHandler.TASK_MANAGER_ID_KEY);
+
+ boolean fetch;
+ synchronized (lastRequestCompleted) {
+ if (!lastRequestCompleted.containsKey(taskManagerID)) {
+ lastRequestCompleted.put(taskManagerID, true);
+ }
+ fetch = lastRequestCompleted.get(taskManagerID);
+ lastRequestCompleted.put(taskManagerID, false);
+ }
+
+ //fetch taskmanager logs if no other process is currently doing
it
+ if (fetch) {
+ //get taskmanager gateway
+ InstanceID instanceID = new
InstanceID(StringUtils.hexStringToByte(taskManagerID));
+ Future<Object> future = jobManager.ask(new
JobManagerMessages.RequestTaskManagerInstance(instanceID), timeout);
+ JobManagerMessages.TaskManagerInstance instance =
(JobManagerMessages.TaskManagerInstance) Await.result(future, timeout);
+ Instance taskManager = instance.instance().get();
+
+ Future<Object> isBlobServiceDefined =
taskManager.getActorGateway().ask(TaskManagerMessages.getIsBlobServiceDefined(),
timeout);
+
+ if (!(Boolean) Await.result(isBlobServiceDefined,
timeout)) {
+ display(ctx, request, "BlobService unavailable,
cannot upload TaskManager logs.");
+ return;
+ }
+
+ //send log request to taskmanager
+ Future<Object> blobKeyFuture =
taskManager.getActorGateway().ask(serveLogFile ?
TaskManagerMessages.getRequestTaskManagerLog() :
TaskManagerMessages.getRequestTaskManagerStdout(), timeout);
+ blobKeyFuture.onComplete(new OnComplete<Object>() {
+ @Override
+ public void onComplete(Throwable failure,
Object success) throws Throwable {
+ try {
+ BlobKey blobKey = (BlobKey)
success;
--- End diff --
Not if the receiver sent `null` back.
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