Aliyun E-MapReduce External LogService Support 2.2.0 API

__PROJECT__

LoghubSourceProvider

__SEQUENCE_NUMBER__

LoghubSourceProvider

__SHARD__

LoghubSourceProvider

__SOURCE__

LoghubSourceProvider

__STORE__

LoghubSourceProvider

__TIME__

LoghubSourceProvider

__TOPIC__

LoghubSourceProvider

__VALUE__

LoghubSourceProvider