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supports switching from master observer mode to multi follower mode, and compatible with upgrading from existing master-observers deployment mode to multi-follwers mode
when adding an FE node(add fe cluster, add fe node), there is a 5-minute protection time and the FE node cannot be droped(drop fe cluster, drop fe node)
drop the node. If the node cannot be found, an error will occur and the code will return 404 instead of the previous silent processing
If the MS node starts with 127.0.0.1 IP and the prohibit_use_loopback_addresses is set to true(default), the MS node will not be able to start, ms log will find enable check prohibit use loopback addr, but localhost=127.0.0.1, so exit(-1)
Release note
None
Check List (For Author)
Test
Regression test
Unit Test
Manual test (add detailed scripts or steps below)
No need to test or manual test. Explain why:
This is a refactor/code format and no logic has been changed.
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…ti-follers
What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
IN CLOUD
prohibit_use_loopback_addresses
is set to true(default), the MS node will not be able to start, ms log will findenable check prohibit use loopback addr, but localhost=127.0.0.1, so exit(-1)
Release note
None
Check List (For Author)
Test
Behavior changed:
Does this need documentation?
Check List (For Reviewer who merge this PR)