distributed-sql-database

Hi community,

I found shardingsphere-db-discovery-mgr module need to add unit test. it 's task list :

• MGRDatabaseDiscoveryType.startPeriodicalUpdate()
• MGRDatabaseDiscoveryType.updateProperties()

Description

Currently, for e.g. say that out of 3 copies of a tablet, we want to have 2 copies in C1.R1.Z1 and 1 copy in C2.R2.Z2 then we would specify it as below:

./bin/yb-admin \
    -master_addresses $MASTER_RPC_ADDRS \
    modify_placement_info  \
    C1.R1.Z1,C1.R1.Z1,C2.R2.Z2 3

However, this is somewhat complex and hard to follow. We don't need to necessarily r