Fix colocate balance endless loop bug

[gengjun-git]

Proposed changes

Fix colocate balance endless loop bug when all be down

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• [] New feature (non-breaking change which adds functionality)
• [] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [] Documentation Update (if none of the other choices apply)
• [] Code refactor (Modify the code structure, format the code, etc...)

Checklist

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• [] I have create an issue on (Fix #ISSUE), and have described the bug/feature there in detail
• Compiling and unit tests pass locally with my changes
• [] I have added tests that prove my fix is effective or that my feature works
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• [] Any dependent changes have been merged

Further comments

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[yangzhg]

you'd better create an issue to describe this problem

[gengjun-git]

Fix #5037

[morningman]

deplicated #5079