Java Fetcher.seek示例

  @Override
  public void seekFetcherToInitialOffsets(
      List<KafkaTopicPartitionLeader> partitions, Fetcher fetcher) throws Exception {
    for (KafkaTopicPartitionLeader tp : partitions) {
      long offset =
          getOffsetFromZooKeeper(
              curatorClient,
              groupId,
              tp.getTopicPartition().getTopic(),
              tp.getTopicPartition().getPartition());

      if (offset != OFFSET_NOT_SET) {
        LOG.info(
            "Offset for partition {} was set to {} in ZooKeeper. Seeking fetcher to that position.",
            tp.getTopicPartition().getPartition(),
            offset);

        // the offset in Zookeeper was the last read offset, seek is accepting the
        // next-to-read-offset.
        fetcher.seek(tp.getTopicPartition(), offset + 1);
      }
    }
  }