How is dubbo distributed service load balancing done?

what we know is that consumers go to zk to find provider information, so how does the load balancing of this process do? If a service wants to do grayscale publishing, how to control the traffic.

Mar.05,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3786c-2c0ac.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3786c-2c0ac.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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