[jira] [Created] (SLING-11031) Registration of DisposalCallback is prone to lock contention

["Joerg Hoh (Jira)" <ji...@apache.org>]

Joerg Hoh created SLING-11031:
---------------------------------

             Summary: Registration of DisposalCallback is prone to lock contention
                 Key: SLING-11031
                 URL: https://issues.apache.org/jira/browse/SLING-11031
             Project: Sling
          Issue Type: Improvement
          Components: Sling Models
            Reporter: Joerg Hoh


Under load the registration of the DisposalCallback for a Sling Model can block:

{noformat}
"80.187.114.130 [1639483979813] GET /content/foobar.html HTTP/1.1" #304 prio=5 os_prio=0 cpu=6511.55ms elapsed=150.62s tid=0x00005617e1dc0800 nid=0x1d75 waiting for monitor entry  [0x00007ff060073000]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at org.apache.sling.models.impl.ModelAdapterFactory$RequestDisposalCallbacks.put(ModelAdapterFactory.java:180)
        - waiting to lock <0x0000000669b01360> (a java.util.concurrent.ConcurrentHashMap)
        at org.apache.sling.models.impl.ModelAdapterFactory.registerRequestCallbackRegistry(ModelAdapterFactory.java:679)
        at org.apache.sling.models.impl.ModelAdapterFactory.createObject(ModelAdapterFactory.java:747)
        at org.apache.sling.models.impl.ModelAdapterFactory.internalCreateModel(ModelAdapterFactory.java:428)
        at org.apache.sling.models.impl.ModelAdapterFactory.getAdapter(ModelAdapterFactory.java:270)
        at org.apache.sling.adapter.internal.AdapterManagerImpl.getAdapter(AdapterManagerImpl.java:143)
        at org.apache.sling.engine.impl.SlingMainServlet.adaptTo(SlingMainServlet.java:625)
{noformat}

We should check if it's possible to make the synchronized block smaller



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