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[FLINK-2358] [dashboard] First part dashboard server backend
- Adds a separate Maven project for easier maintenance. Also allows users to refer to runtime without web libraries. - Simple HTTP server based on Netty HTTP (slim dependency, since we use netty anyways) - REST URL parsing via Netty Router - Abstract stubs for handlers that deal with errors and request/response - First set of URL request handlers that produce JSON responses This closes #677 This closes #623 This closes #297
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| <?xml version="1.0" encoding="UTF-8"?> | |||
| <!-- | |||
| 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. | |||
| --> | |||
| <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |||
| xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> | |||
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| <modelVersion>4.0.0</modelVersion> | |||
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| <parent> | |||
| <groupId>org.apache.flink</groupId> | |||
| <artifactId>flink-parent</artifactId> | |||
| <version>0.10-SNAPSHOT</version> | |||
| <relativePath>..</relativePath> | |||
| </parent> | |||
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| <artifactId>flink-runtime-web</artifactId> | |||
| <name>flink-runtime-web</name> | |||
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| <packaging>jar</packaging> | |||
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| <dependencies> | |||
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| <!-- =================================================== | |||
| Flink Dependencies | |||
| =================================================== --> | |||
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| <dependency> | |||
| <groupId>org.apache.flink</groupId> | |||
| <artifactId>flink-runtime</artifactId> | |||
| <version>${project.version}</version> | |||
| </dependency> | |||
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| <dependency> | |||
| <groupId>org.apache.flink</groupId> | |||
| <artifactId>flink-test-utils</artifactId> | |||
| <version>${project.version}</version> | |||
| </dependency> | |||
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| <dependency> | |||
| <groupId>org.apache.flink</groupId> | |||
| <artifactId>flink-java-examples</artifactId> | |||
| <version>${project.version}</version> | |||
| </dependency> | |||
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| <!-- =================================================== | |||
| Dependencies for the Web Server | |||
| =================================================== --> | |||
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| <dependency> | |||
| <groupId>tv.cntt</groupId> | |||
| <artifactId>netty-router</artifactId> | |||
| <version>1.10</version> | |||
| </dependency> | |||
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| <dependency> | |||
| <groupId>org.javassist</groupId> | |||
| <artifactId>javassist</artifactId> | |||
| <version>3.18.2-GA</version> | |||
| </dependency> | |||
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| <!-- =================================================== | |||
| Dependencies for Actor Calls | |||
| =================================================== --> | |||
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| <dependency> | |||
| <groupId>org.scala-lang</groupId> | |||
| <artifactId>scala-library</artifactId> | |||
| </dependency> | |||
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| <dependency> | |||
| <groupId>com.typesafe.akka</groupId> | |||
| <artifactId>akka-actor_${scala.binary.version}</artifactId> | |||
| </dependency> | |||
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| <dependency> | |||
| <groupId>com.typesafe.akka</groupId> | |||
| <artifactId>akka-remote_${scala.binary.version}</artifactId> | |||
| </dependency> | |||
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| <!-- =================================================== | |||
| Utilities | |||
| =================================================== --> | |||
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| <dependency> | |||
| <groupId>com.google.guava</groupId> | |||
| <artifactId>guava</artifactId> | |||
| <version>${guava.version}</version> | |||
| </dependency> | |||
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| </dependencies> | |||
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| </project> | |||
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...k-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/ExecutionGraphHolder.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. | |||
| */ | |||
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| package org.apache.flink.runtime.webmonitor; | |||
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| import akka.actor.ActorRef; | |||
| import akka.pattern.Patterns; | |||
| import akka.util.Timeout; | |||
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| import org.apache.flink.api.common.JobID; | |||
| import org.apache.flink.runtime.executiongraph.ExecutionGraph; | |||
| import org.apache.flink.runtime.messages.JobManagerMessages; | |||
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| import scala.concurrent.Await; | |||
| import scala.concurrent.Future; | |||
| import scala.concurrent.duration.FiniteDuration; | |||
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| import java.util.WeakHashMap; | |||
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| /** | |||
| * Gateway to obtaining an {@link ExecutionGraph} from a source, like JobManager or Archiver. | |||
| * <p> | |||
| * The holder will cache the ExecutionGraph behind a weak reference, which will be cleared | |||
| * at some point once no one else is pointing to the ExecutionGraph. | |||
| * Note that while the holder runs in the same JVM as the JobManager or Archive, the reference should | |||
| * stay valid. | |||
| */ | |||
| public class ExecutionGraphHolder { | |||
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| private final ActorRef source; | |||
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| private final FiniteDuration timeout; | |||
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| private final WeakHashMap<JobID, ExecutionGraph> cache = new WeakHashMap<JobID, ExecutionGraph>(); | |||
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| public ExecutionGraphHolder(ActorRef source) { | |||
| this(source, WebRuntimeMonitor.DEFAULT_REQUEST_TIMEOUT); | |||
| } | |||
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| public ExecutionGraphHolder(ActorRef source, FiniteDuration timeout) { | |||
| if (source == null || timeout == null) { | |||
| throw new NullPointerException(); | |||
| } | |||
| this.source = source; | |||
| this.timeout = timeout; | |||
| } | |||
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| public ExecutionGraph getExecutionGraph(JobID jid) { | |||
| ExecutionGraph cached = cache.get(jid); | |||
| if (cached != null) { | |||
| return cached; | |||
| } | |||
|
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| try { | |||
| Timeout to = new Timeout(timeout); | |||
| Future<Object> future = Patterns.ask(source, new JobManagerMessages.RequestJob(jid), to); | |||
| Object result = Await.result(future, timeout); | |||
| if (result instanceof JobManagerMessages.JobNotFound) { | |||
| return null; | |||
| } | |||
| else if (result instanceof JobManagerMessages.JobFound) { | |||
| ExecutionGraph eg = ((JobManagerMessages.JobFound) result).executionGraph(); | |||
| cache.put(jid, eg); | |||
| return eg; | |||
| } | |||
| else { | |||
| throw new RuntimeException("Unknown response from JobManager / Archive: " + result); | |||
| } | |||
| } | |||
| catch (Exception e) { | |||
| throw new RuntimeException("Error requesting execution graph", e); | |||
| } | |||
| } | |||
| } | |||
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