フリー問題

問題文

A team joins a huge fact table with a small lookup table of two thousand rows. They want the small table to be sent to the workers once and reused, instead of being shuffled with the big one. How often is a broadcast variable sent?

選択肢

1. A broadcast variable is shipped once per storage block and reused by every task there.
2. A broadcast variable is shipped once per running executor and reused by every task there.
3. A broadcast variable is shipped once per single task and reused by every task there.
4. A broadcast variable is shipped once per scheduled partition and reused by every task there.