Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18253
And idle spark-shell should be using 0% of the CPU.
```
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1304 vanzin 20 0 6773996 743104 31468 S 0.3 2.3 0:37.28 java
```
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