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feat: Compute head offset for Spark connector micro batch mode. (#439)
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...l-streaming/src/main/java/com/google/cloud/pubsublite/spark/LimitingHeadOffsetReader.java
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|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| /* | ||
| * Copyright 2020 Google LLC | ||
| * | ||
| * Licensed 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 com.google.cloud.pubsublite.spark; | ||
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| import com.github.benmanes.caffeine.cache.AsyncLoadingCache; | ||
| import com.github.benmanes.caffeine.cache.Caffeine; | ||
| import com.github.benmanes.caffeine.cache.Ticker; | ||
| import com.google.api.core.ApiFutureCallback; | ||
| import com.google.api.core.ApiFutures; | ||
| import com.google.cloud.pubsublite.Offset; | ||
| import com.google.cloud.pubsublite.Partition; | ||
| import com.google.cloud.pubsublite.TopicPath; | ||
| import com.google.cloud.pubsublite.internal.TopicStatsClient; | ||
| import com.google.cloud.pubsublite.proto.Cursor; | ||
| import com.google.common.annotations.VisibleForTesting; | ||
| import com.google.common.util.concurrent.MoreExecutors; | ||
| import java.util.HashSet; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.Executor; | ||
| import java.util.concurrent.TimeUnit; | ||
|
|
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| /** | ||
| * Rate limited HeadOffsetReader, utilizing a LoadingCache that refreshes all partitions head | ||
| * offsets for the topic at most once per minute. | ||
| */ | ||
| public class LimitingHeadOffsetReader implements PerTopicHeadOffsetReader { | ||
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| private final TopicStatsClient topicStatsClient; | ||
| private final TopicPath topic; | ||
| private final long topicPartitionCount; | ||
| private final AsyncLoadingCache<Partition, Offset> cachedHeadOffsets; | ||
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| @VisibleForTesting | ||
| public LimitingHeadOffsetReader( | ||
| TopicStatsClient topicStatsClient, TopicPath topic, long topicPartitionCount, Ticker ticker) { | ||
| this.topicStatsClient = topicStatsClient; | ||
| this.topic = topic; | ||
| this.topicPartitionCount = topicPartitionCount; | ||
| this.cachedHeadOffsets = | ||
| Caffeine.newBuilder() | ||
| .ticker(ticker) | ||
| .expireAfterWrite(1, TimeUnit.MINUTES) | ||
| .buildAsync(this::loadHeadOffset); | ||
| } | ||
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| private CompletableFuture<Offset> loadHeadOffset(Partition partition, Executor executor) { | ||
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| CompletableFuture<Offset> result = new CompletableFuture<>(); | ||
| ApiFutures.addCallback( | ||
| topicStatsClient.computeHeadCursor(topic, partition), | ||
| new ApiFutureCallback<Cursor>() { | ||
| @Override | ||
| public void onFailure(Throwable t) { | ||
| result.completeExceptionally(t); | ||
| } | ||
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| @Override | ||
| public void onSuccess(Cursor c) { | ||
| result.complete(Offset.of(c.getOffset())); | ||
| } | ||
| }, | ||
| MoreExecutors.directExecutor()); | ||
| return result; | ||
| } | ||
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| @Override | ||
| public PslSourceOffset getHeadOffset() { | ||
| Set<Partition> keySet = new HashSet<>(); | ||
| for (int i = 0; i < topicPartitionCount; i++) { | ||
| keySet.add(Partition.of(i)); | ||
| } | ||
| CompletableFuture<Map<Partition, Offset>> future = cachedHeadOffsets.getAll(keySet); | ||
| try { | ||
| return PslSourceOffset.builder().partitionOffsetMap(future.get()).build(); | ||
| } catch (Throwable t) { | ||
| throw new IllegalStateException("Unable to compute head offset for topic: " + topic, t); | ||
| } | ||
| } | ||
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| @Override | ||
| public void close() { | ||
| topicStatsClient.close(); | ||
| } | ||
| } |
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