In RawKV, compare-and-swap (CAS) is an atomic instruction to achieve synchronization between multiple threads.

Performing CAS is an atomic equivalent of executing the following code:

Make sure that you have installed TiUP, jshell, downloaded tikv-client JAR files, and started a TiKV cluster according to TiKV in 5 Minutes.

Verify CAS

To verify whether CAS works, you can take the following steps.

Step 2: Run the code

The example output is as follows:

As in the example output, after calling compareAndSet, the value CAS is replaced by newValue.

• To guarantee the atomicity of CAS, write operations such as put or delete in atomic mode take more resources.