timothy65535 opened a new issue #940:
URL: https://github.com/apache/incubator-kyuubi/issues/940
### 1. Describe the bug
After several benchmarks in the offline environment, kyuubi consumes a lot
of CPU.
```
[bigdata]$ jps
3188 Main
6036 Jps
4189 KyuubiServer
[bigdata]$ top
top - 09:34:21 up 23 min, 1 user, load average: 10.67, 7.85, 4.98
Tasks: 320 total, 1 running, 319 sleeping, 0 stopped, 0 zombie
%Cpu(s): 48.2 us, 23.9 sy, 0.0 ni, 27.4 id, 0.0 wa, 0.5 hi, 0.0 si, 0.0
st
MiB Mem : 15806.0 total, 4738.4 free, 6085.0 used, 4982.5 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 9306.5 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
4189 bigdata 20 0 10.1g 311272 22484 S 633.3 1.9 48:12.21 java
```
### 2. Environments
#### 2.1 Versions
- Kyuubi
- [x] 1.3.0
- Spark
- [x] 3.1.x
#### 2.2 Kyuubi Configurations
#### 2.3 Spark Configurations
### 3. Steps to reproduce
When more clients connect to kyuubi server with different user, kyuubiserver
consumes more and more cpu.
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