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https://issues.apache.org/jira/browse/BEAM-10114?focusedWorklogId=522474&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-522474
]
ASF GitHub Bot logged work on BEAM-10114:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Dec/20 23:51
Start Date: 09/Dec/20 23:51
Worklog Time Spent: 10m
Work Description: boyuanzz commented on a change in pull request #13470:
URL: https://github.com/apache/beam/pull/13470#discussion_r539735970
##########
File path:
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsublite/PerPartitionSdf.java
##########
@@ -0,0 +1,139 @@
+/*
+ * 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.sdk.io.gcp.pubsublite;
+
+import com.google.cloud.pubsublite.Offset;
+import com.google.cloud.pubsublite.Partition;
+import com.google.cloud.pubsublite.internal.PullSubscriber;
+import com.google.cloud.pubsublite.internal.wire.Committer;
+import com.google.cloud.pubsublite.proto.SequencedMessage;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Iterables;
+import com.google.common.flogger.GoogleLogger;
+import com.google.protobuf.util.Timestamps;
+import java.util.Collections;
+import java.util.List;
+import org.apache.beam.sdk.io.range.OffsetRange;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.SerializableBiFunction;
+import org.apache.beam.sdk.transforms.SerializableFunction;
+import org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker;
+import org.apache.beam.sdk.util.Sleeper;
+import org.joda.time.Duration;
+import org.joda.time.Instant;
+
+class PerPartitionSdf extends DoFn<Partition, SequencedMessage> {
+ private static final GoogleLogger logger = GoogleLogger.forEnclosingClass();
+ private final Duration maxSleepTime;
+ private final SerializableBiFunction<Partition, Offset,
PullSubscriber<SequencedMessage>>
+ subscriberFactory;
+ private final SerializableFunction<Partition, Committer> committerFactory;
+ private final SerializableSupplier<Sleeper> sleeperSupplier;
+ private final SerializableFunction<Partition, InitialOffsetReader>
offsetReaderFactory;
+ private final SerializableBiFunction<
+ Partition, OffsetRange, RestrictionTracker<OffsetRange,
OffsetByteProgress>>
+ trackerFactory;
+
+ Duration sleepTimeRemaining;
+
+ PerPartitionSdf(
+ Duration maxSleepTime,
+ SerializableBiFunction<Partition, Offset,
PullSubscriber<SequencedMessage>> subscriberFactory,
+ SerializableFunction<Partition, Committer> committerFactory,
+ SerializableSupplier<Sleeper> sleeperSupplier,
+ SerializableFunction<Partition, InitialOffsetReader> offsetReaderFactory,
+ SerializableBiFunction<
+ Partition, OffsetRange, RestrictionTracker<OffsetRange,
OffsetByteProgress>>
+ trackerFactory) {
+ this.maxSleepTime = maxSleepTime;
+ this.sleepTimeRemaining = maxSleepTime;
+ this.subscriberFactory = subscriberFactory;
+ this.committerFactory = committerFactory;
+ this.sleeperSupplier = sleeperSupplier;
+ this.offsetReaderFactory = offsetReaderFactory;
+ this.trackerFactory = trackerFactory;
+ }
+
+ private List<SequencedMessage> doPoll(PullSubscriber<SequencedMessage>
subscriber)
+ throws Exception {
+ Sleeper sleeper = sleeperSupplier.get();
+ while (sleepTimeRemaining.isLongerThan(Duration.ZERO)) {
+ List<SequencedMessage> messages = subscriber.pull();
+ if (!messages.isEmpty()) {
+ return messages;
+ }
+ Duration sleepTime =
+ Collections.min(ImmutableList.of(sleepTimeRemaining,
Duration.millis(50)));
+ sleepTimeRemaining = sleepTimeRemaining.minus(sleepTime);
+ sleeper.sleep(sleepTime.getMillis());
+ }
+ return ImmutableList.of();
+ }
+
+ @ProcessElement
+ public ProcessContinuation processElement(
+ RestrictionTracker<OffsetRange, OffsetByteProgress> tracker,
+ @Element Partition partition,
+ OutputReceiver<SequencedMessage> receiver)
+ throws Exception {
+ logger.atInfo().log("Starting processing for partition " + partition);
+ sleepTimeRemaining = maxSleepTime;
+ Committer committer = committerFactory.apply(partition);
+ committer.startAsync().awaitRunning();
+ try (PullSubscriber<SequencedMessage> subscriber =
+ subscriberFactory.apply(partition,
Offset.of(tracker.currentRestriction().getFrom()))) {
+ while (true) {
+ List<SequencedMessage> messages = doPoll(subscriber);
+ // We polled for as long as possible, yield to the runtime to allow it
to reschedule us on
+ // a new task.
+ if (messages.isEmpty()) {
+ logger.atInfo().log("Yielding due to timeout on partition " +
partition);
+ return ProcessContinuation.resume();
+ }
+ Offset lastOffset =
Offset.of(Iterables.getLast(messages).getCursor().getOffset());
+ long byteSize =
messages.stream().mapToLong(SequencedMessage::getSizeBytes).sum();
+ if (tracker.tryClaim(OffsetByteProgress.of(lastOffset, byteSize))) {
+ messages.forEach(
+ message ->
+ receiver.outputWithTimestamp(
+ message, new
Instant(Timestamps.toMillis(message.getPublishTime()))));
+ committer.commitOffset(Offset.of(lastOffset.value() + 1)).get();
Review comment:
You can either use [bundle
finalization](https://beam.apache.org/documentation/programming-guide/#bundle-finalization)
to commit offsets, which is best-effort. This is similar to how CheckpointMark
of UnboundedSource works. Or you can do something similar to Kafka
[CommitOffset](https://github.com/apache/beam/blob/master/sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaCommitOffset.java)
transform.
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Issue Time Tracking
-------------------
Worklog Id: (was: 522474)
Time Spent: 16h 10m (was: 16h)
> Add Pub/Sub Lite IO to beam builtin
> -----------------------------------
>
> Key: BEAM-10114
> URL: https://issues.apache.org/jira/browse/BEAM-10114
> Project: Beam
> Issue Type: New Feature
> Components: io-java-gcp
> Reporter: Daniel Collins
> Priority: P3
> Time Spent: 16h 10m
> Remaining Estimate: 0h
>
> The IO currently lives [on the pubsub lite
> github|[https://github.com/googleapis/java-pubsublite/tree/master/pubsublite-beam-io]]
> but should be moved to being part of beam.
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