flink kafka connector scan.startup.mode 的几个选项

  • 2021-07-13
  • 浏览 (73)

flink kafka创建表样例:

CREATE TABLE KafkaTable (
  `user_id` BIGINT,
  `item_id` BIGINT,
  `behavior` STRING,
  `ts` TIMESTAMP(3) METADATA FROM 'timestamp'
) WITH (
  'connector' = 'kafka',
  'topic' = 'user_behavior',
  'properties.bootstrap.servers' = 'localhost:9092',
  'properties.group.id' = 'testGroup',
  'scan.startup.mode' = 'earliest-offset',
  'format' = 'csv'
)

scan.startup.mode指定了读取kafka的位置,有几个选项:

  • group-offsets: start from committed offsets in ZK / Kafka brokers of a specific consumer group.
  • earliest-offset: start from the earliest offset possible.
  • latest-offset: start from the latest offset.
  • timestamp: start from user-supplied timestamp for each partition.
  • specific-offsets: start from user-supplied specific offsets for each partition.

The default option value is group-offsets which indicates to consume from last committed offsets in ZK / Kafka brokers.

If timestamp is specified, another config option scan.startup.timestamp-millis is required to specify a specific startup timestamp in milliseconds since January 1, 1970 00:00:00.000 GMT.

If specific-offsets is specified, another config option scan.startup.specific-offsets is required to specify specific startup offsets for each partition, e.g. an option value partition:0,offset:42;partition:1,offset:300 indicates offset 42 for partition 0 and offset 300 for partition 1.

官方文档 Start Reading Position

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