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feat: Spark micro batch processing (#426)
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30 changes: 30 additions & 0 deletions
30
...spark-sql-streaming/src/main/java/com/google/cloud/pubsublite/spark/HeadOffsetReader.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package com.google.cloud.pubsublite.spark; | ||
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| import com.google.cloud.pubsublite.TopicPath; | ||
| import com.google.cloud.pubsublite.internal.CheckedApiException; | ||
| import java.io.Closeable; | ||
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| public interface HeadOffsetReader extends Closeable { | ||
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| // Gets the head offsets for all partitions in a topic. Blocks. | ||
| PslSourceOffset getHeadOffset(TopicPath topic) throws CheckedApiException; | ||
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| @Override | ||
| void close(); | ||
| } |
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66 changes: 66 additions & 0 deletions
66
...treaming/src/main/java/com/google/cloud/pubsublite/spark/PslMicroBatchInputPartition.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package com.google.cloud.pubsublite.spark; | ||
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| import com.google.cloud.pubsublite.SubscriptionPath; | ||
| import com.google.cloud.pubsublite.cloudpubsub.FlowControlSettings; | ||
| import com.google.cloud.pubsublite.internal.BlockingPullSubscriber; | ||
| import com.google.cloud.pubsublite.internal.BlockingPullSubscriberImpl; | ||
| import com.google.cloud.pubsublite.internal.CheckedApiException; | ||
| import com.google.cloud.pubsublite.internal.wire.SubscriberFactory; | ||
| import com.google.cloud.pubsublite.proto.Cursor; | ||
| import com.google.cloud.pubsublite.proto.SeekRequest; | ||
| import org.apache.spark.sql.catalyst.InternalRow; | ||
| import org.apache.spark.sql.sources.v2.reader.InputPartition; | ||
| import org.apache.spark.sql.sources.v2.reader.InputPartitionReader; | ||
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| public class PslMicroBatchInputPartition implements InputPartition<InternalRow> { | ||
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| private final SubscriberFactory subscriberFactory; | ||
| private final SparkPartitionOffset endOffset; | ||
| private final SubscriptionPath subscriptionPath; | ||
| private final FlowControlSettings flowControlSettings; | ||
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| public PslMicroBatchInputPartition( | ||
| SubscriptionPath subscriptionPath, | ||
| FlowControlSettings flowControlSettings, | ||
| SparkPartitionOffset endOffset, | ||
| SubscriberFactory subscriberFactory) { | ||
| this.endOffset = endOffset; | ||
| this.subscriptionPath = subscriptionPath; | ||
| this.flowControlSettings = flowControlSettings; | ||
| this.subscriberFactory = subscriberFactory; | ||
| } | ||
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| @Override | ||
| public InputPartitionReader<InternalRow> createPartitionReader() { | ||
| BlockingPullSubscriber subscriber; | ||
| try { | ||
| subscriber = | ||
| new BlockingPullSubscriberImpl( | ||
| subscriberFactory, | ||
| flowControlSettings, | ||
| SeekRequest.newBuilder() | ||
| .setCursor(Cursor.newBuilder().setOffset(endOffset.offset()).build()) | ||
| .build()); | ||
| } catch (CheckedApiException e) { | ||
| throw new IllegalStateException( | ||
| "Unable to create PSL subscriber for " + endOffset.partition(), e); | ||
| } | ||
| return new PslMicroBatchInputPartitionReader(subscriptionPath, endOffset, subscriber); | ||
| } | ||
| } |
98 changes: 98 additions & 0 deletions
98
...ng/src/main/java/com/google/cloud/pubsublite/spark/PslMicroBatchInputPartitionReader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package com.google.cloud.pubsublite.spark; | ||
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| import com.google.cloud.pubsublite.SequencedMessage; | ||
| import com.google.cloud.pubsublite.SubscriptionPath; | ||
| import com.google.cloud.pubsublite.internal.BlockingPullSubscriber; | ||
| import com.google.common.annotations.VisibleForTesting; | ||
| import com.google.common.flogger.GoogleLogger; | ||
| import java.time.Duration; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.TimeoutException; | ||
| import javax.annotation.Nullable; | ||
| import org.apache.spark.sql.catalyst.InternalRow; | ||
| import org.apache.spark.sql.sources.v2.reader.InputPartitionReader; | ||
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| public class PslMicroBatchInputPartitionReader implements InputPartitionReader<InternalRow> { | ||
| private static final GoogleLogger log = GoogleLogger.forEnclosingClass(); | ||
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| private static final Duration SUBSCRIBER_PULL_TIMEOUT = Duration.ofSeconds(10); | ||
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| private final SubscriptionPath subscriptionPath; | ||
| private final SparkPartitionOffset endOffset; | ||
| private final BlockingPullSubscriber subscriber; | ||
| @Nullable private SequencedMessage currentMsg = null; | ||
| private boolean batchFulfilled = false; | ||
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| @VisibleForTesting | ||
| PslMicroBatchInputPartitionReader( | ||
| SubscriptionPath subscriptionPath, | ||
| SparkPartitionOffset endOffset, | ||
| BlockingPullSubscriber subscriber) { | ||
| this.subscriptionPath = subscriptionPath; | ||
| this.subscriber = subscriber; | ||
| this.endOffset = endOffset; | ||
| } | ||
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| @Override | ||
| public boolean next() { | ||
| if (batchFulfilled) { | ||
| return false; | ||
| } | ||
| Optional<SequencedMessage> msg; | ||
| while (true) { | ||
| try { | ||
| subscriber.onData().get(SUBSCRIBER_PULL_TIMEOUT.getSeconds(), TimeUnit.SECONDS); | ||
| msg = subscriber.messageIfAvailable(); | ||
| break; | ||
| } catch (TimeoutException e) { | ||
| log.atWarning().log("Unable to get any messages in last " + SUBSCRIBER_PULL_TIMEOUT); | ||
| } catch (Throwable t) { | ||
| throw new IllegalStateException("Failed to retrieve messages.", t); | ||
| } | ||
| } | ||
| // since next() is only called on one thread at a time, we are sure that the message is | ||
| // available to this thread. | ||
| assert msg.isPresent(); | ||
| currentMsg = msg.get(); | ||
| if (currentMsg.offset().value() == endOffset.offset()) { | ||
| // this is the last msg for the batch. | ||
| batchFulfilled = true; | ||
| } else if (currentMsg.offset().value() > endOffset.offset()) { | ||
| batchFulfilled = true; | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
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| @Override | ||
| public InternalRow get() { | ||
| assert currentMsg != null; | ||
| return PslSparkUtils.toInternalRow(currentMsg, subscriptionPath, endOffset.partition()); | ||
| } | ||
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| @Override | ||
| public void close() { | ||
| try { | ||
| subscriber.close(); | ||
| } catch (Exception e) { | ||
| log.atWarning().log("Subscriber failed to close."); | ||
| } | ||
| } | ||
| } |
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