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複数の Java スレッドが HashMap に同時にアクセスするため CPU が高くなる

Solution Verified - Updated -

Issue

  • スタックトレースの最上部を確認すると見つかる HashMapにアクセスしているスレッド群が、CPU やスレッド使用率の多くを占有しています。たとえば、以下のようなスタックトレースです。
"RMI TCP Connection(4468)-160.57.110.76" daemon prio=6 tid=0x5a436400 nid=0x9e4 runnable [0x6068d000]
   java.lang.Thread.State:RUNNABLE
     at java.util.HashMap.get(HashMap.java:303)
     at com.example.service.getWidget(Component.java:796)
...

"WorkManager(3)-122" daemon prio=6 tid=0x5b496000 nid=0x18fc runnable [0x70b2e000]
   java.lang.Thread.State:RUNNABLE
     at java.util.HashMap.get(HashMap.java:303)
     at com.example.service.getWidget(Component.java:796)
...

Environment

  • Java
  • JBoss Enterprise Application Platform (EAP)

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