The riemann client opened 98 threads and all of them blocked at sun.nio.ch.EPollArrayWrapper.epollWait

[Root-Fang]

Hi developer:

I use riemann-java-client 0.4.3 in my program. And I found there are 98 threads blocked at sun.nio.ch.EPollArrayWrapper.epollWait. The following is the call stack generated by jcmd Thread.print.

"New I/O worker #19172423" #19963249 prio=5 os_prio=0 tid=0x00007f5e70806800 nid=0x11a1a runnable [0x00007f60354d3000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x00000001de60b0c8> (a sun.nio.ch.Util$3)
- locked <0x00000001de60b0b8> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000001de60b070> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.jboss.netty.channel.socket.nio.SelectorUtil.select(SelectorUtil.java:64)
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.select(AbstractNioSelector.java:410)
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:207)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:88)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

[mcorbin]

Hi,

What JVM/Linux version do you use ?

[Root-Fang]

java : openjdk version "1.8.0_161"
Linux: Linux version 3.10.0-514.el7.x86_64
@mcorbin