ecyuan opened a new issue #8342:
URL: https://github.com/apache/dubbo/issues/8342
### Environment
* Dubbo version: 2.7.5 / 2.7.12
* Java version: JDK1.8
### my dubbo config
```
dubbo.protocol.threads=5
dubbo.protocol.corethreads=2
dubbo.protocol.alive=15000
dubbo.protocol.threadpool=cached
```
I hope idle thread will be recycle after 15 seconds.
```
Invoke some service, jstack java process show as follow, 5 thread idle:
"Dubbo-thread-5" #108 daemon prio=5 os_prio=0 tid=0x0000000033e54000
nid=0x2410 waiting on condition [0x000000004761e000]
at
org.apache.dubbo.common.threadlocal.InternalRunnable.run(InternalRunnable.java:41)
"Dubbo-thread-4" #107 daemon prio=5 os_prio=0 tid=0x0000000033e53800
nid=0x395c waiting on condition [0x000000004751f000]
at
org.apache.dubbo.common.threadlocal.InternalRunnable.run(InternalRunnable.java:41)
"Dubbo-thread-3" #106 daemon prio=5 os_prio=0 tid=0x0000000033e51000
nid=0x3858 waiting on condition [0x000000004741e000]
at
org.apache.dubbo.common.threadlocal.InternalRunnable.run(InternalRunnable.java:41)
"Dubbo-thread-2" #97 daemon prio=5 os_prio=0 tid=0x0000000033e4c800
nid=0x2210 waiting on condition [0x000000004637f000]
at
org.apache.dubbo.common.threadlocal.InternalRunnable.run(InternalRunnable.java:41)
"Dubbo-thread-1" #96 daemon prio=5 os_prio=0 tid=0x0000000033e47800
nid=0x12e8 waiting on condition [0x000000004526e000]
```
But after 15 seconds or more, these idle thread still alive, unexpectedly
been recycled.
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