[SNOW-943288] Do not skip records when we're expecting the offset to …

…be reset (snowflakedb#729)

src/main/java/com/snowflake/kafka/connector/internal/SnowflakeConnectionServiceV1.java

@@ -488,7 +488,8 @@ public boolean hasSchemaEvolutionPermission(String tableName, String role) {
   public void appendColumnsToTable(String tableName, Map<String, String> columnToType) {
     checkConnection();
     InternalUtils.assertNotEmpty("tableName", tableName);
-    StringBuilder appendColumnQuery = new StringBuilder("alter table identifier(?) add column if not exists ");
+    StringBuilder appendColumnQuery =
+        new StringBuilder("alter table identifier(?) add column if not exists ");
     boolean first = true;
     StringBuilder logColumn = new StringBuilder("[");
     for (String columnName : columnToType.keySet()) {

src/main/java/com/snowflake/kafka/connector/internal/streaming/TopicPartitionChannel.java

@@ -112,7 +112,9 @@ public class TopicPartitionChannel {
    *   <li>If channel fails to fetch offsetToken from Snowflake, we reopen the channel and try to
    *       fetch offset from Snowflake again
    *   <li>If channel fails to ingest a buffer(Buffer containing rows/offsets), we reopen the
-   *       channel and try to fetch offset from Snowflake again
+   *       channel and try to fetch offset from Snowflake again. Schematization purposefully fails
+   *       the first buffer insert in order to alter the table, and then expects Kafka to resend
+   *       data
    * </ol>
    *
    * <p>In both cases above, we ask Kafka to send back offsets, strictly from offset number after
@@ -124,7 +126,7 @@ public class TopicPartitionChannel {
    * <p>This boolean is used to indicate that we reset offset in kafka and we will only buffer once
    * we see the offset which is one more than an offset present in Snowflake.
    */
-  private boolean isOffsetResetInKafka;
+  private boolean isOffsetResetInKafka = false;
 
   private final SnowflakeStreamingIngestClient streamingIngestClient;
 
@@ -391,14 +393,13 @@ public void insertRecordToBuffer(SinkRecord kafkaSinkRecord) {
    *
    * @param kafkaSinkRecord Record to check for above condition only in case of failures
    *     (isOffsetResetInKafka = true)
+   * @param currentProcessedOffset The current processed offset
    * @return true if this record can be skipped to add into buffer, false otherwise.
    */
   private boolean shouldIgnoreAddingRecordToBuffer(
-      SinkRecord kafkaSinkRecord, long currentProcessedOffset) {
-    // Don't skip rows if there is no offset reset or there is no offset token information in the
-    // channel
-    if (!isOffsetResetInKafka
-        || currentProcessedOffset == NO_OFFSET_TOKEN_REGISTERED_IN_SNOWFLAKE) {
+      SinkRecord kafkaSinkRecord, final long currentProcessedOffset) {
+    // Don't skip rows if there is no offset reset
+    if (!isOffsetResetInKafka) {
       return false;
     }
 

src/test/java/com/snowflake/kafka/connector/internal/streaming/TopicPartitionChannelIT.java

@@ -18,6 +18,9 @@
 import net.snowflake.ingest.streaming.OpenChannelRequest;
 import net.snowflake.ingest.streaming.SnowflakeStreamingIngestClient;
 import org.apache.kafka.common.TopicPartition;
+import org.apache.kafka.connect.data.Schema;
+import org.apache.kafka.connect.data.SchemaAndValue;
+import org.apache.kafka.connect.json.JsonConverter;
 import org.apache.kafka.connect.sink.SinkRecord;
 import org.junit.After;
 import org.junit.Assert;
@@ -485,4 +488,78 @@ public void testSimpleInsertRowsFailureWithArrowBDECFormat() throws Exception {
     service.insert(records);
     service.closeAll();
   }
+
+  @Test
+  public void testPartialBatchChannelInvalidationIngestion_schematization() throws Exception {
+    Map<String, String> config = TestUtils.getConfForStreaming();
+    config.put(
+        SnowflakeSinkConnectorConfig.BUFFER_COUNT_RECORDS, "500"); // we want to flush on record
+    config.put(SnowflakeSinkConnectorConfig.BUFFER_FLUSH_TIME_SEC, "500000");
+    config.put(SnowflakeSinkConnectorConfig.BUFFER_SIZE_BYTES, "500000");
+    config.put(
+        SnowflakeSinkConnectorConfig.ENABLE_SCHEMATIZATION_CONFIG,
+        "true"); // using schematization to invalidate
+
+    // setup
+    InMemorySinkTaskContext inMemorySinkTaskContext =
+        new InMemorySinkTaskContext(Collections.singleton(topicPartition));
+    SnowflakeSinkService service =
+        SnowflakeSinkServiceFactory.builder(conn, IngestionMethodConfig.SNOWPIPE_STREAMING, config)
+            .setRecordNumber(1)
+            .setErrorReporter(new InMemoryKafkaRecordErrorReporter())
+            .setSinkTaskContext(inMemorySinkTaskContext)
+            .addTask(testTableName, topicPartition)
+            .build();
+
+    final long firstBatchCount = 18;
+    final long secondBatchCount = 500;
+
+    // create 18 blank records that do not kick off schematization
+    JsonConverter converter = new JsonConverter();
+    HashMap<String, String> converterConfig = new HashMap<>();
+    converterConfig.put("schemas.enable", "false");
+    converter.configure(converterConfig, false);
+    SchemaAndValue schemaInputValue = converter.toConnectData("test", null);
+
+    List<SinkRecord> firstBatch = new ArrayList<>();
+    for (int i = 0; i < firstBatchCount; i++) {
+      firstBatch.add(
+          new SinkRecord(
+              topic,
+              PARTITION,
+              Schema.STRING_SCHEMA,
+              "test",
+              schemaInputValue.schema(),
+              schemaInputValue.value(),
+              i));
+    }
+
+    service.insert(firstBatch);
+
+    // send batch with 500, should kick off a record based flush and schematization on record 19,
+    // which will fail the batches
+    List<SinkRecord> secondBatch =
+        TestUtils.createNativeJsonSinkRecords(firstBatchCount, secondBatchCount, topic, PARTITION);
+    service.insert(secondBatch);
+
+    // resend batch 1 and 2 because 2 failed for schematization
+    service.insert(firstBatch);
+    service.insert(secondBatch);
+
+    // ensure all data was ingested
+    TestUtils.assertWithRetry(
+        () ->
+            service.getOffset(new TopicPartition(topic, PARTITION))
+                == firstBatchCount + secondBatchCount,
+        20,
+        5);
+    assert TestUtils.tableSize(testTableName) == firstBatchCount + secondBatchCount
+        : "expected: "
+            + firstBatchCount
+            + secondBatchCount
+            + " actual: "
+            + TestUtils.tableSize(testTableName);
+
+    service.closeAll();
+  }
 }

src/test/java/com/snowflake/kafka/connector/internal/streaming/TopicPartitionChannelTest.java

@@ -397,15 +397,24 @@ public void testFetchOffsetTokenWithRetry_RuntimeException() {
   /* Only SFExceptions goes into fallback -> reopens channel, fetch offsetToken and throws Appropriate exception */
   @Test
   public void testInsertRows_SuccessAfterReopenChannel() throws Exception {
+    final int noOfRecords = 5;
+    int expectedInsertRowsCount = 0;
+    int expectedOpenChannelCount = 0;
+    int expectedGetOffsetCount = 0;
+
+    // setup mocks to fail first insert and return two null snowflake offsets (open channel and
+    // failed insert) before succeeding
     Mockito.when(
             mockStreamingChannel.insertRows(
                 ArgumentMatchers.any(Iterable.class), ArgumentMatchers.any(String.class)))
-        .thenThrow(SF_EXCEPTION);
-
-    // get null from snowflake first time it is called and null for second time too since insert
-    // rows was failure
-    Mockito.when(mockStreamingChannel.getLatestCommittedOffsetToken()).thenReturn(null);
+        .thenThrow(SF_EXCEPTION)
+        .thenReturn(new InsertValidationResponse());
+    Mockito.when(mockStreamingChannel.getLatestCommittedOffsetToken())
+        .thenReturn(null)
+        .thenReturn(null)
+        .thenReturn(Long.toString(noOfRecords - 1));
 
+    // create tpchannel
     TopicPartitionChannel topicPartitionChannel =
         new TopicPartitionChannel(
             mockStreamingClient,
@@ -417,37 +426,47 @@ public void testInsertRows_SuccessAfterReopenChannel() throws Exception {
             mockKafkaRecordErrorReporter,
             mockSinkTaskContext,
             mockTelemetryService);
-    final int noOfRecords = 5;
-    // Since record 0 was not able to ingest, all records in this batch will not be added into the
-    // buffer.
+    expectedOpenChannelCount++;
+    expectedGetOffsetCount++;
+
+    // verify initial mock counts after tpchannel creation
+    Mockito.verify(topicPartitionChannel.getChannel(), Mockito.times(expectedInsertRowsCount))
+        .insertRows(ArgumentMatchers.any(Iterable.class), ArgumentMatchers.any(String.class));
+    Mockito.verify(mockStreamingClient, Mockito.times(expectedOpenChannelCount))
+        .openChannel(ArgumentMatchers.any());
+    Mockito.verify(topicPartitionChannel.getChannel(), Mockito.times(expectedGetOffsetCount))
+        .getLatestCommittedOffsetToken();
+
+    // Test inserting record 0, which should fail to ingest so the other records are ignored
     List<SinkRecord> records =
         TestUtils.createJsonStringSinkRecords(0, noOfRecords, TOPIC, PARTITION);
-
     records.forEach(topicPartitionChannel::insertRecordToBuffer);
+    expectedInsertRowsCount++;
+    expectedOpenChannelCount++;
+    expectedGetOffsetCount++;
 
-    Mockito.verify(topicPartitionChannel.getChannel(), Mockito.times(noOfRecords))
+    // verify mocks only tried ingesting once
+    Mockito.verify(topicPartitionChannel.getChannel(), Mockito.times(expectedInsertRowsCount))
         .insertRows(ArgumentMatchers.any(Iterable.class), ArgumentMatchers.any(String.class));
-    Mockito.verify(mockStreamingClient, Mockito.times(noOfRecords + 1))
+    Mockito.verify(mockStreamingClient, Mockito.times(expectedOpenChannelCount))
         .openChannel(ArgumentMatchers.any());
-    Mockito.verify(topicPartitionChannel.getChannel(), Mockito.times(noOfRecords + 1))
+    Mockito.verify(topicPartitionChannel.getChannel(), Mockito.times(expectedGetOffsetCount))
         .getLatestCommittedOffsetToken();
 
-    // Now, it should be successful
-    Mockito.when(
-            mockStreamingChannel.insertRows(
-                ArgumentMatchers.any(Iterable.class), ArgumentMatchers.any(String.class)))
-        .thenReturn(new InsertValidationResponse());
-
-    Mockito.when(mockStreamingChannel.getLatestCommittedOffsetToken())
-        .thenReturn(Long.toString(noOfRecords - 1));
-
     // Retry the insert again, now everything should be ingested and the offset token should be
     // noOfRecords-1
     records.forEach(topicPartitionChannel::insertRecordToBuffer);
-    Mockito.verify(topicPartitionChannel.getChannel(), Mockito.times(noOfRecords * 2))
-        .insertRows(ArgumentMatchers.any(Iterable.class), ArgumentMatchers.any(String.class));
-
     Assert.assertEquals(noOfRecords - 1, topicPartitionChannel.fetchOffsetTokenWithRetry());
+    expectedInsertRowsCount += noOfRecords;
+    expectedGetOffsetCount++;
+
+    // verify mocks ingested each record
+    Mockito.verify(topicPartitionChannel.getChannel(), Mockito.times(expectedInsertRowsCount))
+        .insertRows(ArgumentMatchers.any(Iterable.class), ArgumentMatchers.any(String.class));
+    Mockito.verify(mockStreamingClient, Mockito.times(expectedOpenChannelCount))
+        .openChannel(ArgumentMatchers.any());
+    Mockito.verify(topicPartitionChannel.getChannel(), Mockito.times(expectedGetOffsetCount))
+        .getLatestCommittedOffsetToken();
   }
 
   @Test

test/rest_request_template/test_schema_evolution_w_random_row_count.json

@@ -0,0 +1,28 @@
+{
+  "name": "SNOWFLAKE_CONNECTOR_NAME",
+  "config": {
+    "connector.class": "com.snowflake.kafka.connector.SnowflakeSinkConnector",
+    "topics": "SNOWFLAKE_TEST_TOPIC0,SNOWFLAKE_TEST_TOPIC1",
+    "snowflake.topic2table.map": "SNOWFLAKE_TEST_TOPIC0:SNOWFLAKE_CONNECTOR_NAME,SNOWFLAKE_TEST_TOPIC1:SNOWFLAKE_CONNECTOR_NAME",
+    "tasks.max": "1",
+    "buffer.flush.time": "60",
+    "buffer.count.records": "300",
+    "buffer.size.bytes": "5000000",
+    "snowflake.url.name": "SNOWFLAKE_HOST",
+    "snowflake.user.name": "SNOWFLAKE_USER",
+    "snowflake.private.key": "SNOWFLAKE_PRIVATE_KEY",
+    "snowflake.database.name": "SNOWFLAKE_DATABASE",
+    "snowflake.schema.name": "SNOWFLAKE_SCHEMA",
+    "snowflake.role.name": "SNOWFLAKE_ROLE",
+    "snowflake.ingestion.method": "SNOWPIPE_STREAMING",
+    "key.converter": "org.apache.kafka.connect.storage.StringConverter",
+    "value.converter": "org.apache.kafka.connect.json.JsonConverter",
+    "value.converter.schemas.enable": "false",
+    "jmx": "true",
+    "errors.tolerance": "all",
+    "errors.log.enable": true,
+    "errors.deadletterqueue.topic.name": "DLQ_TOPIC",
+    "errors.deadletterqueue.topic.replication.factor": 1,
+    "snowflake.enable.schematization": true
+  }
+}

test/rest_request_template/travis_correct_schema_evolution_w_auto_table_creation_avro_sr.json

@@ -5,8 +5,8 @@
     "topics": "SNOWFLAKE_TEST_TOPIC0,SNOWFLAKE_TEST_TOPIC1",
     "snowflake.topic2table.map": "SNOWFLAKE_TEST_TOPIC0:SNOWFLAKE_CONNECTOR_NAME,SNOWFLAKE_TEST_TOPIC1:SNOWFLAKE_CONNECTOR_NAME",
     "tasks.max": "1",
-    "buffer.flush.time": "10",
-    "buffer.count.records": "100",
+    "buffer.flush.time": "60",
+    "buffer.count.records": "300",
     "buffer.size.bytes": "5000000",
     "snowflake.url.name": "SNOWFLAKE_HOST",
     "snowflake.user.name": "SNOWFLAKE_USER",

test/rest_request_template/travis_correct_schema_evolution_w_auto_table_creation_json.json

@@ -5,8 +5,8 @@
     "topics": "SNOWFLAKE_TEST_TOPIC0,SNOWFLAKE_TEST_TOPIC1",
     "snowflake.topic2table.map": "SNOWFLAKE_TEST_TOPIC0:SNOWFLAKE_CONNECTOR_NAME,SNOWFLAKE_TEST_TOPIC1:SNOWFLAKE_CONNECTOR_NAME",
     "tasks.max": "1",
-    "buffer.flush.time": "10",
-    "buffer.count.records": "100",
+    "buffer.flush.time": "60",
+    "buffer.count.records": "300",
     "buffer.size.bytes": "5000000",
     "snowflake.url.name": "SNOWFLAKE_HOST",
     "snowflake.user.name": "SNOWFLAKE_USER",

test/test_suit/test_schema_evolution_w_auto_table_creation_avro_sr.py

@@ -12,7 +12,11 @@ def __init__(self, driver, nameSalt):
         self.fileName = "travis_correct_schema_evolution_w_auto_table_creation_avro_sr"
         self.topics = []
         self.table = self.fileName + nameSalt
-        self.recordNum = 100
+
+        # records
+        self.initialRecordCount = 12
+        self.flushRecordCount = 300
+        self.recordNum = self.initialRecordCount + self.flushRecordCount
 
         for i in range(2):
             self.topics.append(self.table + str(i))
@@ -78,8 +82,15 @@ def getConfigFileName(self):
 
     def send(self):
         for i, topic in enumerate(self.topics):
+            # send initial batch
+            value = []
+            for _ in range(self.initialRecordCount):
+                value.append(self.records[i])
+            self.driver.sendAvroSRData(topic, value, self.valueSchema[i], key=[], key_schema="", partition=0)
+
+            # send second batch that should flush
             value = []
-            for _ in range(self.recordNum):
+            for _ in range(self.flushRecordCount):
                 value.append(self.records[i])
             self.driver.sendAvroSRData(topic, value, self.valueSchema[i], key=[], key_schema="", partition=0)
 

test/test_suit/test_schema_evolution_w_auto_table_creation_json.py

@@ -13,7 +13,11 @@ def __init__(self, driver, nameSalt):
         self.fileName = "travis_correct_schema_evolution_w_auto_table_creation_json"
         self.topics = []
         self.table = self.fileName + nameSalt
-        self.recordNum = 100
+
+        # records
+        self.initialRecordCount = 12
+        self.flushRecordCount = 300
+        self.recordNum = self.initialRecordCount + self.flushRecordCount
 
         for i in range(2):
             self.topics.append(self.table + str(i))
@@ -48,9 +52,18 @@ def getConfigFileName(self):
 
     def send(self):
         for i, topic in enumerate(self.topics):
+            # send initial batch
+            key = []
+            value = []
+            for e in range(self.initialRecordCount):
+                key.append(json.dumps({'number': str(e)}).encode('utf-8'))
+                value.append(json.dumps(self.records[i]).encode('utf-8'))
+            self.driver.sendBytesData(topic, value, key)
+
+            # send second batch that should flush
             key = []
             value = []
-            for e in range(self.recordNum):
+            for e in range(self.flushRecordCount):
                 key.append(json.dumps({'number': str(e)}).encode('utf-8'))
                 value.append(json.dumps(self.records[i]).encode('utf-8'))
             self.driver.sendBytesData(topic, value, key)