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https://issues.apache.org/jira/browse/BEAM-3327?focusedWorklogId=93493&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-93493
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ASF GitHub Bot logged work on BEAM-3327:
----------------------------------------
Author: ASF GitHub Bot
Created on: 20/Apr/18 23:29
Start Date: 20/Apr/18 23:29
Worklog Time Spent: 10m
Work Description: tgroh commented on a change in pull request #5189:
[BEAM-3327] Basic Docker environment factory
URL: https://github.com/apache/beam/pull/5189#discussion_r183187927
##########
File path:
runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/control/MapControlClientPool.java
##########
@@ -0,0 +1,99 @@
+/*
+ * 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.fnexecution.control;
+
+import com.google.common.collect.Maps;
+import java.time.Duration;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import javax.annotation.concurrent.GuardedBy;
+
+/**
+ * A {@link ControlClientPool} backed by a client map. It is expected that a
given client id will be
+ * requested at most once.
+ */
+public class MapControlClientPool implements ControlClientPool {
+
+ /** Creates a {@link MapControlClientPool} with an unspecified timeout. */
+ public static MapControlClientPool create() {
+ return withTimeout(Duration.ofSeconds(Long.MAX_VALUE));
+ }
+
+ /**
+ * Creates a {@link MapControlClientPool} with the given timeout. Timeouts
only apply to source
+ * requests.
+ */
+ public static MapControlClientPool withTimeout(Duration timeout) {
+ return new MapControlClientPool(timeout);
+ }
+
+ private final Duration timeout;
+ private final Object lock = new Object();
+
+ @GuardedBy("lock")
+ private final Map<String, CompletableFuture<InstructionRequestHandler>>
clients =
+ Maps.newHashMap();
+
+ private MapControlClientPool(Duration timeout) {
+ this.timeout = timeout;
+ }
+
+ @Override
+ public Source getSource() {
+ return this::getClient;
+ }
+
+ @Override
+ public Sink getSink() {
+ return this::putClient;
+ }
+
+ private void putClient(String workerId, InstructionRequestHandler client) {
+ synchronized (lock) {
+ CompletableFuture<InstructionRequestHandler> future =
+ clients.computeIfAbsent(workerId,
MapControlClientPool::createClientFuture);
+ boolean success = future.complete(client);
+ if (!success) {
+ throw new IllegalStateException(
+ String.format("Control client for worker id %s failed to compete",
workerId));
+ }
+ }
+ }
+
+ private InstructionRequestHandler getClient(String workerId)
+ throws ExecutionException, InterruptedException, TimeoutException {
+ CompletableFuture<InstructionRequestHandler> future;
+ synchronized (lock) {
+ future = clients.computeIfAbsent(workerId,
MapControlClientPool::createClientFuture);
Review comment:
e.g. everyone who gets the future calls `ConcurrentMap.computeIfAbsent(id,
createClientFuture)`, and just uses the returned value every time. Removes all
of the associated synchronization.
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Issue Time Tracking
-------------------
Worklog Id: (was: 93493)
Time Spent: 16.5h (was: 16h 20m)
> Add abstractions to manage Environment Instance lifecycles.
> -----------------------------------------------------------
>
> Key: BEAM-3327
> URL: https://issues.apache.org/jira/browse/BEAM-3327
> Project: Beam
> Issue Type: New Feature
> Components: runner-core
> Reporter: Thomas Groh
> Assignee: Ben Sidhom
> Priority: Major
> Labels: portability
> Time Spent: 16.5h
> Remaining Estimate: 0h
>
> This permits remote stage execution for arbitrary environments
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