High CPU due to multiple Java threads accessing TreeMap simultaneously

Solution Verified - Updated -

Issue

  • High cpu.
  • Thread(s) consuming cpu have TreeMap at the top of the stack trace. For example:
    Raw
    "ajp-0.0.0.0-8209-2" daemon prio=10 tid=0x08668800 nid=0x38e runnable [0x4c382000]
   java.lang.Thread.State: RUNNABLE
     at java.util.TreeMap.put(TreeMap.java:552)
...
"ajp-0.0.0.0-8209-3" daemon prio=10 tid=0x08343000 nid=0x3cf runnable [0x4c23e000]
   java.lang.Thread.State: RUNNABLE
     at java.util.TreeMap.getEntry(TreeMap.java:335)
     at java.util.TreeMap.get(TreeMap.java:255)
...
"ajp-0.0.0.0-8209-4" daemon prio=10 tid=0x08409400 nid=0x408 runnable [0x4bee9000]
   java.lang.Thread.State: RUNNABLE
     at java.util.TreeMap.getEntry(TreeMap.java:335)
     at java.util.TreeMap.get(TreeMap.java:255)
...
"ajp-0.0.0.0-8209-5" daemon prio=10 tid=0x089d9c00 nid=0x448 runnable [0x4c28f000]
   java.lang.Thread.State: RUNNABLE
     at java.util.TreeMap.put(TreeMap.java:552)
...

Environment

  • Java

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