Storage go crazy while balancing data

[kikimo]

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Describe the bug (required)

Storage go crazy while balancing data. We've describe this problem in #3657 , and we've found the situation: 3000+% cpu usage of storage. To reproduce this problem, besides the steps we described in #3657, we also turn on discruption of network partition.

Your Environments (required)

• OS: uname -a
• Compiler: g++ --version or clang++ --version
• CPU: lscpu
• Commit id (e.g. a3ffc7d8)

How To Reproduce(required)

Steps to reproduce the behavior:

1. Step 1
2. Step 2
3. Step 3

Expected behavior

Additional context

[liwenhui-soul]

fixed in #3668