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From uce <...@git.apache.org>
Subject [GitHub] flink pull request #3460: [FLINK-1579] Implement History Server
Date Mon, 06 Mar 2017 15:25:18 GMT
Github user uce commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3460#discussion_r104432833
  
    --- Diff: flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/history/HistoryServer.java
---
    @@ -0,0 +1,411 @@
    +/*
    + * 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.history;
    +
    +import com.fasterxml.jackson.core.JsonFactory;
    +import com.fasterxml.jackson.core.JsonGenerator;
    +import com.fasterxml.jackson.databind.JsonNode;
    +import com.fasterxml.jackson.databind.ObjectMapper;
    +import io.netty.handler.codec.http.router.Router;
    +import org.apache.flink.api.java.utils.ParameterTool;
    +import org.apache.flink.configuration.Configuration;
    +import org.apache.flink.configuration.GlobalConfiguration;
    +import org.apache.flink.configuration.HistoryServerOptions;
    +import org.apache.flink.core.fs.FileStatus;
    +import org.apache.flink.core.fs.FileSystem;
    +import org.apache.flink.core.fs.Path;
    +import org.apache.flink.runtime.filecache.FileCache;
    +import org.apache.flink.runtime.net.SSLUtils;
    +import org.apache.flink.runtime.util.ExecutorThreadFactory;
    +import org.apache.flink.runtime.webmonitor.handlers.CurrentJobsOverviewHandler;
    +import org.apache.flink.runtime.webmonitor.handlers.DashboardConfigHandler;
    +import org.apache.flink.runtime.webmonitor.utils.NettySetup;
    +import org.apache.flink.util.FileUtils;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import javax.net.ssl.SSLContext;
    +import java.io.File;
    +import java.io.FileWriter;
    +import java.io.IOException;
    +import java.nio.file.Files;
    +import java.util.ArrayList;
    +import java.util.Iterator;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.TimerTask;
    +import java.util.UUID;
    +import java.util.concurrent.ConcurrentHashMap;
    +import java.util.concurrent.CountDownLatch;
    +import java.util.concurrent.Executors;
    +import java.util.concurrent.ScheduledExecutorService;
    +import java.util.concurrent.TimeUnit;
    +
    +public class HistoryServer {
    +
    +	private static final Logger LOG = LoggerFactory.getLogger(HistoryServer.class);
    +	private static final JsonFactory jacksonFactory = new JsonFactory();
    +	private static final ObjectMapper mapper = new ObjectMapper();
    +
    +	private static final String OVERVIEWS_FOLDER_NAME = "overviews";
    +
    +	private final String webAddress;
    +	private final int webPort;
    +	private final long webRefreshIntervalMillis;
    +	private final File webDir;
    +
    +	private final long refreshIntervalMillis;
    +	private final List<Path> refreshDirs = new ArrayList<>();
    +
    +	/** Map containing the JobID of all fetched jobs and the refreshDir from with they originate.
*/
    +	private final Map<String, Path> cachedArchives = new ConcurrentHashMap<>();
    +
    +	private final SSLContext serverSSLContext;
    +	private NettySetup netty;
    +	private final Object startupShutdownLock = new Object();
    +
    +	private final ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor(
    +		new ExecutorThreadFactory("Flink-HistoryServer-FileFetcher"));
    +	private final JobArchiveFetcherTask fetcherTask;
    +
    +	public static void main(String[] args) throws Exception {
    +		ParameterTool pt = ParameterTool.fromArgs(args);
    +		String configDir = pt.getRequired("configDir");
    +
    +		LOG.info("Loading configuration from {}", configDir);
    +		Configuration flinkConfig = GlobalConfiguration.loadConfiguration(configDir);
    +
    +		HistoryServer hs = new HistoryServer(flinkConfig);
    +		hs.run();
    +	}
    +
    +	public HistoryServer(Configuration config) throws IOException {
    +		if (config.getBoolean(HistoryServerOptions.HISTORY_SERVER_WEB_SSL_ENABLED) &&
SSLUtils.getSSLEnabled(config)) {
    +			LOG.info("Enabling ssl for the history server.");
    +			try {
    +				this.serverSSLContext = SSLUtils.createSSLServerContext(config);
    +			} catch (Exception e) {
    +				throw new IOException("Failed to initialize SSLContext for the history server.",
e);
    +			}
    +		} else {
    +			this.serverSSLContext = null;
    +		}
    +
    +		webAddress = config.getString(HistoryServerOptions.HISTRY_SERVER_WEB_ADDRESS);
    +		webPort = config.getInteger(HistoryServerOptions.HISTORY_SERVER_WEB_PORT);
    +		webRefreshIntervalMillis = config.getLong(HistoryServerOptions.HISTORY_SERVER_WEB_REFRESH_INTERVAL);
    +
    +		String webDirectory = config.getString(HistoryServerOptions.HISTORY_SERVER_WEB_DIR);
    +		if (webDirectory == null) {
    +			webDirectory = System.getProperty("java.io.tmpdir") + "flink-web-history-" + UUID.randomUUID();
    +		}
    +		webDir = new File(webDirectory);
    +
    +		String refreshDirectories = config.getString(HistoryServerOptions.HISTORY_SERVER_DIR);
    +		if (refreshDirectories == null) {
    +			throw new IOException(HistoryServerOptions.HISTORY_SERVER_DIR + " was not configured.");
    +		}
    +		for (String refreshDirectory : refreshDirectories.split(",")) {
    +			refreshDirs.add(new Path(refreshDirectory));
    +		}
    +		refreshIntervalMillis = config.getLong(HistoryServerOptions.HISTORY_SERVER_REFRESH_INTERVAL);
    +
    +		this.fetcherTask = new JobArchiveFetcherTask(refreshDirs, cachedArchives, webDir);
    +
    +		// add shutdown hook for deleting the directories and remaining temp files on shutdown
    +		try {
    +			Runtime.getRuntime().addShutdownHook(new Thread() {
    +				@Override
    +				public void run() {
    +					HistoryServer.this.stop();
    +				}
    +			});
    +		} catch (IllegalStateException e) {
    +			// race, JVM is in shutdown already, we can safely ignore this
    +			LOG.debug("Unable to add shutdown hook, shutdown already in progress", e);
    +		} catch (Throwable t) {
    +			// these errors usually happen when the shutdown is already in progress
    +			LOG.warn("Error while adding shutdown hook", t);
    +		}
    +	}
    +
    +	public void run() {
    +		try {
    +			start();
    +			while (true) {
    +				try {
    +					new CountDownLatch(1).await();
    +				} catch (InterruptedException e) {
    +					Thread.currentThread().interrupt();
    +				}
    +			}
    +		} catch (Exception e) {
    +			LOG.error("Failure while running HistoryServer.", e);
    +		} finally {
    +			stop();
    +		}
    +	}
    +
    +	// =================================================================================================================
    +	// Life-cycle
    +	// =================================================================================================================
    +	private void start() throws IOException, InterruptedException {
    +		synchronized (startupShutdownLock) {
    +			LOG.info("Starting history server.");
    +
    +			Files.createDirectories(webDir.toPath());
    +			LOG.info("Using directory {} as local cache.", webDir);
    +			if (LOG.isInfoEnabled()) {
    +				for (Path refreshDir : refreshDirs) {
    +					LOG.info("Monitoring directory {} for archived jobs.", refreshDir);
    +				}
    +			}
    +
    +			Router router = new Router();
    +			router.GET("/:*", new HistoryServerStaticFileServerHandler(webDir, new JobFileFetcher(new
Path(webDir.getAbsolutePath()), cachedArchives)));
    +
    +			netty = new NettySetup(router, LOG, webDir, serverSSLContext, webAddress, webPort);
    +
    +			createDashboardConfigFile();
    +			updateJobOverview(webDir);
    +
    +			executor.scheduleWithFixedDelay(fetcherTask, refreshIntervalMillis, refreshIntervalMillis,
TimeUnit.MILLISECONDS);
    +		}
    +	}
    +
    +	private void stop() {
    +		synchronized (startupShutdownLock) {
    +			LOG.info("Stopping history server.");
    +			netty.shutdown();
    +			shutdownExecutor();
    +			try {
    +				LOG.info("Removing web dashboard root cache directory {}", webDir);
    +				FileUtils.deleteDirectory(webDir);
    +			} catch (Throwable t) {
    +				LOG.warn("Error while deleting web root directory {}", webDir, t);
    +			}
    +
    +			LOG.info("Stopped history server.");
    +		}
    +	}
    +
    +	private void shutdownExecutor() {
    +		if (executor != null) {
    +			executor.shutdown();
    +
    +			try {
    +				if (!executor.awaitTermination(1, TimeUnit.SECONDS)) {
    +					executor.shutdownNow();
    +				}
    +			} catch (InterruptedException ignored) {
    +				executor.shutdownNow();
    +			}
    +		}
    +	}
    +
    +	// =================================================================================================================
    +	// File-fetching
    +	// =================================================================================================================
    +
    +	/**
    +	 * {@link TimerTask} that polls the directories configured as {@link HistoryServerOptions#HISTORY_SERVER_DIR}
for
    +	 * new job archives.
    +	 */
    +	private static class JobArchiveFetcherTask extends TimerTask {
    +		private final List<Path> refreshDirs;
    +		private final Map<String, Path> cachedArchives;
    +		private final File webDir;
    +		private final Path webJobDir;
    +		private final Path webOverviewDir;
    +		
    +		public JobArchiveFetcherTask(List<Path> refreshDirs, Map<String, Path>
cachedArchives, File webDir) {
    +			this.refreshDirs = refreshDirs;
    +			this.cachedArchives = cachedArchives;
    +			this.webDir = webDir;
    +			this.webJobDir = new Path(webDir.getAbsolutePath(), "jobs");
    +			this.webOverviewDir = new Path(webDir.getAbsolutePath(), OVERVIEWS_FOLDER_NAME);
    +		}
    +
    +		@Override
    +		public void run() {
    +			for (Iterator<Path> iterator = refreshDirs.iterator(); iterator.hasNext();)
{
    --- End diff --
    
    The refresh dirs are static but we check them on every periodic invocation 


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