Failed to create session During data import

[nevermore3]

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Describe the bug (required)

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:

This phenomenon will occur when the data is imported too fast and the raft‘s cache is full.

Expected behavior

Additional context

[Sophie-Xie]

We limit the session numbers in #3729. And we will optimize it in 5.x version。