[DIRMINA-1114] High CPU utilization because of Mina-core jar

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 2.1.2
• Component/s: Core
• Assignee: Jonathan Valliere
• Reporter: Hrushikesh Agrawal
• Created: 24/May/19 12:33
• Updated: 15/Apr/20 14:46
• Resolved: 15/Apr/20 14:46

Description

Hi,

We are have our own product  through which we are trying to communicate with LDAP server by using the mina-core-2.1.2.jar and api-all-1.0.3.jar jars. When we have invalid connection parameter, and tried to get the connection, CPU core utilization is 100%.
Then we have seen in JVisualVM and in Jprofiler that "org.apache.mina.transport.socket.nio.NioSocketConnector" is in CPU more time.

We can see below in thread dump-

"NioSocketConnector-3" #152 prio=5 os_prio=0 tid=0x00007f95940d4000 nid=0x77fb runnable [0x00007f956f1fe000]
   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 <0x00000000ebdf89e8> (a sun.nio.ch.Util$3)
• locked <0x00000000ebdf89d8> (a java.util.Collections$UnmodifiableSet)
• locked <0x00000000ebdf88c0> (a sun.nio.ch.EPollSelectorImpl)
  at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
  at org.apache.mina.transport.socket.nio.NioSocketConnector.select(NioSocketConnector.java:292)
  at org.apache.mina.core.polling.AbstractPollingIoConnector$Connector.run(AbstractPollingIoConnector.java:433)
  at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  at java.lang.Thread.run(Thread.java:748)

We can see same issue with standalone java class and try to get the ldap connection. Attaching couple of snapshot to understand the issue. 
Please note this happens in Ubuntu and Centos. Also found same issue with 2.0.21, 2.0.18 mina core jar.
Can someone please help me on this.
 
Thanks,
Hrushi