A.Consumers track records by (offset, partition, topic)

B.offset is a String type string

C.Uniquely tag a message

D.The position of each message in the file is called offset

A.After the Loader submits a job to YARN for execution, other jobs cannot be submitted until the job is executed.

B.After the Loader submits the job to YARN for execution, if the Loade phase is abnormal at this time, the job fails to execute.

C.The Loader submits the job to the small YARN for execution. If a Mapper task fails to execute, it can automatically retry

D.After the Loadet job fails to execute, garbage data will be generated, which needs to be cleared manually by the user

A.Each worker can run multiple Executors

B.Each worker can only run Executor for one topology

C.Each Executor can run tasks of different components (spout or bolt)

D.Each Executor can run a task

A.128MB

B.64MB

C.32MB

D.16MB

A.Source

B.Topic

C.Sink

D.Channel