🎉 Snowflake destination: reduce memory footprint

airbyte-integrations/bases/base-java/src/main/java/io/airbyte/integrations/base/IntegrationRunner.java

@@ -85,6 +85,7 @@ public void run(final String[] args) throws Exception {
         integration.getClass().getSimpleName(),
         parsed.getCommand().toString(),
         true);
+    LOGGER.info("Sentry transaction event: {}", transaction.getEventId());
     try {
       runInternal(transaction, parsed);
       transaction.finish(SpanStatus.OK);

airbyte-integrations/bases/base-java/src/main/java/io/airbyte/integrations/destination/buffered_stream_consumer/BufferedStreamConsumer.java

@@ -6,7 +6,6 @@
 
 import com.fasterxml.jackson.databind.JsonNode;
 import com.google.common.base.Preconditions;
-import io.airbyte.commons.bytes.ByteUtils;
 import io.airbyte.commons.concurrency.VoidCallable;
 import io.airbyte.commons.functional.CheckedConsumer;
 import io.airbyte.commons.functional.CheckedFunction;
@@ -85,6 +84,7 @@ public class BufferedStreamConsumer extends FailureTrackingAirbyteMessageConsume
   private final Map<AirbyteStreamNameNamespacePair, Long> streamToIgnoredRecordCount;
   private final Consumer<AirbyteMessage> outputRecordCollector;
   private final long maxQueueSizeInBytes;
+  private final RecordSizeEstimator recordSizeEstimator;
   private long bufferSizeInBytes;
   private Map<AirbyteStreamNameNamespacePair, List<AirbyteRecordMessage>> streamBuffer;
   private String fileName;
@@ -128,6 +128,7 @@ public BufferedStreamConsumer(final Consumer<AirbyteMessage> outputRecordCollect
     this.bufferSizeInBytes = 0;
     this.streamToIgnoredRecordCount = new HashMap<>();
     this.streamBuffer = new HashMap<>();
+    this.recordSizeEstimator = new RecordSizeEstimator();
   }
 
   @Override
@@ -158,13 +159,9 @@ protected void acceptTracked(final AirbyteMessage message) throws Exception {
         return;
       }
 
-      // TODO use a more efficient way to compute bytes that doesn't require double serialization (records
-      // are serialized again when writing to
-      // the destination
-      final long messageSizeInBytes = ByteUtils.getSizeInBytesForUTF8CharSet(Jsons.serialize(recordMessage.getData()));
+      final long messageSizeInBytes = recordSizeEstimator.getEstimatedByteSize(recordMessage);
       if (bufferSizeInBytes + messageSizeInBytes > maxQueueSizeInBytes) {
-        LOGGER.info("Flushing buffer...");
-        flushQueueToDestination(bufferSizeInBytes);
+        flushQueueToDestination();
         bufferSizeInBytes = 0;
       }
 
@@ -180,9 +177,12 @@ protected void acceptTracked(final AirbyteMessage message) throws Exception {
 
   }
 
-  private void flushQueueToDestination(long bufferSizeInBytes) throws Exception {
+  private void flushQueueToDestination() throws Exception {
+    LOGGER.info("Flushing buffer: {} bytes", bufferSizeInBytes);
+
     AirbyteSentry.executeWithTracing("FlushBuffer", () -> {
       for (final Map.Entry<AirbyteStreamNameNamespacePair, List<AirbyteRecordMessage>> entry : streamBuffer.entrySet()) {
+        LOGGER.info("Flushing {}: {} records", entry.getKey().getName(), entry.getValue().size());
         recordWriter.accept(entry.getKey(), entry.getValue());
         if (checkAndRemoveRecordWriter != null) {
           fileName = checkAndRemoveRecordWriter.apply(entry.getKey(), fileName);
@@ -215,7 +215,7 @@ protected void close(final boolean hasFailed) throws Exception {
       LOGGER.error("executing on failed close procedure.");
     } else {
       LOGGER.info("executing on success close procedure.");
-      flushQueueToDestination(bufferSizeInBytes);
+      flushQueueToDestination();
     }
 
     try {

airbyte-integrations/bases/base-java/src/main/java/io/airbyte/integrations/destination/buffered_stream_consumer/RecordSizeEstimator.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2021 Airbyte, Inc., all rights reserved.
+ */
+
+package io.airbyte.integrations.destination.buffered_stream_consumer;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.google.common.annotations.VisibleForTesting;
+import io.airbyte.commons.json.Jsons;
+import io.airbyte.protocol.models.AirbyteRecordMessage;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * This class estimate the byte size of the record message. To reduce memory footprint, 1) it
+ * assumes that a character is always four bytes, and 2) it only performs a sampling every N
+ * records. The size of the samples are averaged together to protect the estimation against
+ * outliers.
+ */
+public class RecordSizeEstimator {
+
+  // by default, perform one estimation for every 20 records
+  private static final int DEFAULT_SAMPLE_BATCH_SIZE = 20;
+
+  // latest estimated record message size for each stream
+  private final Map<String, Long> streamRecordSizeEstimation;
+  // number of record messages until next real sampling for each stream
+  private final Map<String, Integer> streamSampleCountdown;
+  // number of record messages
+  private final int sampleBatchSize;
+
+  /**
+   * The estimator will perform a real calculation once per sample batch. The size of the batch is
+   * determined by {@code sampleBatchSize}.
+   */
+  public RecordSizeEstimator(final int sampleBatchSize) {
+    this.streamRecordSizeEstimation = new HashMap<>();
+    this.streamSampleCountdown = new HashMap<>();
+    this.sampleBatchSize = sampleBatchSize;
+  }
+
+  public RecordSizeEstimator() {
+    this(DEFAULT_SAMPLE_BATCH_SIZE);
+  }
+
+  public long getEstimatedByteSize(final AirbyteRecordMessage recordMessage) {
+    final String stream = recordMessage.getStream();
+    final Integer countdown = streamSampleCountdown.get(stream);
+
+    // this is a new stream; initialize its estimation
+    if (countdown == null) {
+      final long byteSize = getStringByteSize(recordMessage.getData());
+      streamRecordSizeEstimation.put(stream, byteSize);
+      streamSampleCountdown.put(stream, sampleBatchSize - 1);
+      return byteSize;
+    }
+
+    // this stream needs update; compute a new estimation
+    if (countdown <= 0) {
+      final long prevMeanByteSize = streamRecordSizeEstimation.get(stream);
+      final long currentByteSize = getStringByteSize(recordMessage.getData());
+      final long newMeanByteSize = prevMeanByteSize / 2 + currentByteSize / 2;
+      streamRecordSizeEstimation.put(stream, newMeanByteSize);
+      streamSampleCountdown.put(stream, sampleBatchSize - 1);
+      return newMeanByteSize;
+    }
+
+    // this stream does not need update; return current estimation
+    streamSampleCountdown.put(stream, countdown - 1);
+    return streamRecordSizeEstimation.get(stream);
+  }
+
+  @VisibleForTesting
+  static long getStringByteSize(final JsonNode data) {
+    // assume UTF-8 encoding, and each char is 4 bytes long
+    return Jsons.serialize(data).length() * 4L;
+  }
+
+}

airbyte-integrations/bases/base-java/src/test/java/io/airbyte/integrations/destination/buffered_stream_consumer/BufferedStreamConsumerTest.java

@@ -16,7 +16,6 @@
 import com.fasterxml.jackson.databind.JsonNode;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Lists;
-import io.airbyte.commons.bytes.ByteUtils;
 import io.airbyte.commons.concurrency.VoidCallable;
 import io.airbyte.commons.functional.CheckedConsumer;
 import io.airbyte.commons.functional.CheckedFunction;
@@ -316,7 +315,7 @@ private static List<AirbyteMessage> generateRecords(final long targetSizeInBytes
     long bytesCounter = 0;
     for (int i = 0;; i++) {
       JsonNode payload = Jsons.jsonNode(ImmutableMap.of("id", RandomStringUtils.randomAlphabetic(7), "name", "human " + String.format("%8d", i)));
-      long sizeInBytes = ByteUtils.getSizeInBytesForUTF8CharSet(Jsons.serialize(payload));
+      long sizeInBytes = RecordSizeEstimator.getStringByteSize(payload);
       bytesCounter += sizeInBytes;
       AirbyteMessage airbyteMessage = new AirbyteMessage()
           .withType(Type.RECORD)

airbyte-integrations/bases/base-java/src/test/java/io/airbyte/integrations/destination/buffered_stream_consumer/RecordSizeEstimatorTest.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2021 Airbyte, Inc., all rights reserved.
+ */
+
+package io.airbyte.integrations.destination.buffered_stream_consumer;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import io.airbyte.commons.json.Jsons;
+import io.airbyte.protocol.models.AirbyteRecordMessage;
+import org.junit.jupiter.api.Test;
+
+class RecordSizeEstimatorTest {
+
+  private static final JsonNode DATA_0 = Jsons.deserialize("{}");
+  private static final JsonNode DATA_1 = Jsons.deserialize("{ \"field1\": true }");
+  private static final JsonNode DATA_2 = Jsons.deserialize("{ \"field1\": 10000 }");
+  private static final long DATA_0_SIZE = RecordSizeEstimator.getStringByteSize(DATA_0);
+  private static final long DATA_1_SIZE = RecordSizeEstimator.getStringByteSize(DATA_1);
+  private static final long DATA_2_SIZE = RecordSizeEstimator.getStringByteSize(DATA_2);
+
+  @Test
+  public void testPeriodicSampling() {
+    // the estimate performs a size sampling every 3 records
+    final RecordSizeEstimator sizeEstimator = new RecordSizeEstimator(3);
+    final String stream = "stream";
+    final AirbyteRecordMessage record0 = new AirbyteRecordMessage().withStream(stream).withData(DATA_0);
+    final AirbyteRecordMessage record1 = new AirbyteRecordMessage().withStream(stream).withData(DATA_1);
+    final AirbyteRecordMessage record2 = new AirbyteRecordMessage().withStream(stream).withData(DATA_2);
+
+    // sample record message 1
+    final long firstEstimation = DATA_1_SIZE;
+    assertEquals(firstEstimation, sizeEstimator.getEstimatedByteSize(record1));
+    // next two calls return the first sampling result
+    assertEquals(firstEstimation, sizeEstimator.getEstimatedByteSize(record0));
+    assertEquals(firstEstimation, sizeEstimator.getEstimatedByteSize(record0));
+
+    // sample record message 2
+    final long secondEstimation = firstEstimation / 2 + DATA_2_SIZE / 2;
+    assertEquals(secondEstimation, sizeEstimator.getEstimatedByteSize(record2));
+    // next two calls return the second sampling result
+    assertEquals(secondEstimation, sizeEstimator.getEstimatedByteSize(record0));
+    assertEquals(secondEstimation, sizeEstimator.getEstimatedByteSize(record0));
+
+    // sample record message 1
+    final long thirdEstimation = secondEstimation / 2 + DATA_1_SIZE / 2;
+    assertEquals(thirdEstimation, sizeEstimator.getEstimatedByteSize(record1));
+    // next two calls return the first sampling result
+    assertEquals(thirdEstimation, sizeEstimator.getEstimatedByteSize(record0));
+    assertEquals(thirdEstimation, sizeEstimator.getEstimatedByteSize(record0));
+  }
+
+  @Test
+  public void testDifferentEstimationPerStream() {
+    final RecordSizeEstimator sizeEstimator = new RecordSizeEstimator();
+    final AirbyteRecordMessage record0 = new AirbyteRecordMessage().withStream("stream1").withData(DATA_0);
+    final AirbyteRecordMessage record1 = new AirbyteRecordMessage().withStream("stream2").withData(DATA_1);
+    final AirbyteRecordMessage record2 = new AirbyteRecordMessage().withStream("stream3").withData(DATA_2);
+    assertEquals(DATA_0_SIZE, sizeEstimator.getEstimatedByteSize(record0));
+    assertEquals(DATA_1_SIZE, sizeEstimator.getEstimatedByteSize(record1));
+    assertEquals(DATA_2_SIZE, sizeEstimator.getEstimatedByteSize(record2));
+  }
+
+}

airbyte-integrations/connectors/destination-snowflake/Dockerfile

@@ -18,8 +18,8 @@ COPY build/distributions/${APPLICATION}*.tar ${APPLICATION}.tar
 
 RUN tar xf ${APPLICATION}.tar --strip-components=1
 
-ENV APPLICATION_VERSION 0.4.12
+ENV APPLICATION_VERSION 0.4.13
 ENV ENABLE_SENTRY true
 
-LABEL io.airbyte.version=0.4.12
+LABEL io.airbyte.version=0.4.13
 LABEL io.airbyte.name=airbyte/destination-snowflake

airbyte-integrations/connectors/destination-snowflake/src/main/java/io/airbyte/integrations/destination/snowflake/SnowflakeStagingSqlOperations.java

@@ -26,7 +26,7 @@ public void insertRecordsInternal(final JdbcDatabase database,
                                     final List<AirbyteRecordMessage> records,
                                     final String schemaName,
                                     final String stage) {
-    LOGGER.info("actual size of batch for staging: {}", records.size());
+    LOGGER.info("Writing {} records to {}", records.size(), stage);
 
     if (records.isEmpty()) {
       return;

airbyte-workers/src/main/java/io/airbyte/workers/DefaultReplicationWorker.java

@@ -301,6 +301,7 @@ private static Runnable getReplicationRunnable(final AirbyteSource source,
             }
           }
         }
+        LOGGER.info("Total records read: {}", recordsRead);
         try {
           destination.notifyEndOfStream();
         } catch (final Exception e) {

airbyte-workers/src/main/java/io/airbyte/workers/process/DockerProcessFactory.java

@@ -101,6 +101,7 @@ public Process create(final String jobId,
         IOs.writeFile(jobRoot, file.getKey(), file.getValue());
       }
 
+      LOGGER.info("Creating docker job ID: {}", jobId);
       final List<String> cmd = Lists.newArrayList(
           "docker",
           "run",

docs/integrations/destinations/snowflake.md

@@ -224,6 +224,7 @@ Finally, you need to add read/write permissions to your bucket with that email.
 
 | Version | Date       | Pull Request | Subject |
 |:--------|:-----------| :-----       | :------ |
+| 0.4.13  | 2022-02-16 | [\#10394](https://github.com/airbytehq/airbyte/pull/10394) | Reduce memory footprint. |
 | 0.4.12  | 2022-02-15 | [\#10342](https://github.com/airbytehq/airbyte/pull/10342) | Use connection pool, and fix connection leak. |
 | 0.4.11  | 2022-02-14 | [\#9920](https://github.com/airbytehq/airbyte/pull/9920) | Updated the size of staging files for S3 staging. Also, added closure of S3 writers to staging files when data has been written to an staging file. |
 | 0.4.10  | 2022-02-14 | [\#10297](https://github.com/airbytehq/airbyte/pull/10297) | Halve the record buffer size to reduce memory consumption. |