title: Tomcat stop working: there are no ajp available
body: <p>My Tomcat 7.0.27 running with Liferay 6.1.20-ee-ga2 stop working during high load.
  Running jstack give me a lot of this thread that seems to do nothing and blocking ajp resource.
  The cpu is not in high load (less than 55%).</p>
  
  <p>"ajp-bio-8009-exec-8930" daemon prio=10 tid=0x00007f8a5c12f800 nid=0xcc26 runnable [0x0000000000000000]
         java.lang.Thread.State: RUNNABLE</p>
  
  <pre><code>   Locked ownable synchronizers:
          - None
  
  "ajp-bio-8009-exec-8929" daemon prio=10 tid=0x00007f8a5c12e800 nid=0xcc25 runnable [0x0000000000000000]
     java.lang.Thread.State: RUNNABLE
  
     Locked ownable synchronizers:
          - None
  
  "ajp-bio-8009-exec-8928" daemon prio=10 tid=0x00007f8a5c0eb800 nid=0xcc20 runnable [0x0000000000000000]
     java.lang.Thread.State: RUNNABLE
  
     Locked ownable synchronizers:
          - None
  
  "ajp-bio-8009-exec-8927" daemon prio=10 tid=0x00007f8a5c042800 nid=0xcc1f runnable [0x0000000000000000]
     java.lang.Thread.State: RUNNABLE
  
     Locked ownable synchronizers:
          - None
  </code></pre>
  
  <p>Could someone explain me what these thread are doing? Is it normal that they are in this state?
  Thanks</p>