f7730031b8
This PR is to reduce lock competition by supporting read and write lock in table level. When we modify or read table's meta, we don't need to get database lock, just get table write or read lock. And when we get database lock, that means meta directly in db cannot be modified by other thread. Database lock only protect meta in Database class, while table lock protect meta in Table class. Co-authored-by: caiconghui [蔡聪辉] <caiconghui@xiaomi.com>
# fe-common This module is used to store some common classes of other modules. # spark-dpp This module is Spark DPP program, used for Spark Load function. Depends: fe-common # fe-core This module is the main process module of FE. Depends: fe-common, spark-dpp