高并发的情况下，线程池中有空闲连接，但是获取连接会很慢

zggg commented 4 years ago

`"http-nio-8080-exec-381" #559 daemon prio=5 os_prio=0 tid=0x00007f9758018800 nid=0x1bd5 waiting on condition [0x00007f9715012000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)

parking to wait for <0x00000007001d8320> (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.doAcquireInterruptibly(AbstractQueuedSynchronizer.java:897) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(AbstractQueuedSynchronizer.java:1222) at java.util.concurrent.locks.ReentrantLock.lockInterruptibly(ReentrantLock.java:335) at com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:1562) at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:1395) at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5059) at com.alibaba.druid.filter.FilterAdapter.dataSource_getConnection(FilterAdapter.java:2756) at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5055) at com.alibaba.druid.filter.stat.StatFilter.dataSource_getConnection(StatFilter.java:680) at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5055) at com.alibaba.druid.filter.FilterAdapter.dataSource_getConnection(FilterAdapter.java:2756) at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5055) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1373) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1365) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:109)`

zggg commented 4 years ago

"http-nio-8080-exec-381" #559 daemon prio=5 os_prio=0 tid=0x00007f9758018800 nid=0x1bd5 waiting on condition [0x00007f9715012000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000007001d8320> (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.doAcquireInterruptibly(AbstractQueuedSynchronizer.java:897) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(AbstractQueuedSynchronizer.java:1222) at java.util.concurrent.locks.ReentrantLock.lockInterruptibly(ReentrantLock.java:335) at com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:1562) at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:1395) at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5059) at com.alibaba.druid.filter.FilterAdapter.dataSource_getConnection(FilterAdapter.java:2756) at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5055) at com.alibaba.druid.filter.stat.StatFilter.dataSource_getConnection(StatFilter.java:680) at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5055) at com.alibaba.druid.filter.FilterAdapter.dataSource_getConnection(FilterAdapter.java:2756) at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5055) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1373) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1365) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:109)

打印线程堆栈，看到很多获取连接的时候在这个地方挂起