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From zentol <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-2732] Display TM logs in Dashboard
Date Tue, 15 Mar 2016 15:23:47 GMT
Github user zentol commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1790#discussion_r56181881
  
    --- 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;
    --- End diff --
    
    i think it's overkill for a binary option, and won't make the code more readable.


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