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docs(thread pool): add note about HikarPool thread pool
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java/basic/java-thread-juc.md

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@@ -261,3 +261,11 @@ JAVA为了优化性能,可能对指令进行重排,这些重排在大部分
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吞吐,指单位时间处理的请求数;
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时延,指单次处理的平均耗时;
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并发,同一时刻可以接入的请求数
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SpringBoot中使用HikariPool线程池,号称最快的,在我们关闭程序是,会打印log:
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```java
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sconnected from the target VM, address: '127.0.0.1:57835', transport: 'socket'
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2020-05-18 21:28:54.525 INFO 15232 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
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2020-05-18 21:28:54.526 INFO 15232 --- [extShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
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2020-05-18 21:28:55.925 INFO 15232 --- [extShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
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```

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