jiandu created KAFKA-16879:
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Summary: SystemTime should use singleton mode
Key: KAFKA-16879
URL: https://issues.apache.org/jira/browse/KAFKA-16879
Project: Kafka
Issue Type: Improvement
Reporter: jiandu
Currently, the {{SystemTime}} class, which provides system time-related
functionalities such as getting the current timestamp 、sleep、and await can be
instantiated multiple times.
Howerver, system time is unique，In an application, the time obtained in
different places should be consistent, But now the time obtained by using the
Java System class to interact with the underlying layer is the same。
So I suggest changing it to a singleton mode， reflect the uniqueness of system
time in design
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