Package org.apache.flink.streaming.connectors.kafka.internals

Class KafkaTopicPartitionStateSentinel

java.lang.Object
org.apache.flink.streaming.connectors.kafka.internals.KafkaTopicPartitionStateSentinel
@Internal public class KafkaTopicPartitionStateSentinel extends Object
Magic values used to represent special offset states before partitions are actually read.

The values are all negative. Negative offsets are not used by Kafka (invalid), so we pick a number that is probably (hopefully) not used by Kafka as a magic number for anything else.

  • Field Details

    • OFFSET_NOT_SET

      public static final long OFFSET_NOT_SET
      Magic number that defines an unset offset.
      See Also:

    • EARLIEST_OFFSET

      public static final long EARLIEST_OFFSET
      Magic number that defines the partition should start from the earliest offset.

      This is used as a placeholder so that the actual earliest offset can be evaluated lazily when the partition will actually start to be read by the consumer.

      See Also:

    • LATEST_OFFSET

      public static final long LATEST_OFFSET
      Magic number that defines the partition should start from the latest offset.

      This is used as a placeholder so that the actual latest offset can be evaluated lazily when the partition will actually start to be read by the consumer.

      See Also:

    • GROUP_OFFSET

      public static final long GROUP_OFFSET
      Magic number that defines the partition should start from its committed group offset in Kafka.

      This is used as a placeholder so that the actual committed group offset can be evaluated lazily when the partition will actually start to be read by the consumer.

      See Also:

  • Constructor Details

    • KafkaTopicPartitionStateSentinel

      public KafkaTopicPartitionStateSentinel()

  • Method Details

    • isSentinel

      public static boolean isSentinel(long offset)