[BUG] Druid 连接池ActiveCount大于了poolingCount

[lawmansoft]

Database Type

MySQL

Database Version

MySQL5.7

Druid Version

1.2.6

JDK Version

OpenJDK 8

Error SQL

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Testcase Code

No response

Stacktrace Info

No response

Error Info

No response

[lawmansoft]

线上系统发生了大量的线程卡顿，通过 MAT 分析内存，查看连接池
maxActive=200 activeCount=40 poolingCount=15

大量线程卡在等待连接池的lock.lock()
"http-nio-8089-exec-2380" #4614 daemon prio=5 os_prio=0 tid=0x00007fb0e04cc800 nid=0x789e waiting on condition [0x00007fb07b8f4000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x0000000702050fd0> (a java.util.concurrent.locks.ReentrantLock$FairSync)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
at java.util.concurrent.locks.ReentrantLock$FairSync.lock(ReentrantLock.java:224)
at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
at com.alibaba.druid.pool.DruidDataSource.getConnectCount(DruidDataSource.java:2325)