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From Donald Ball <ba...@webslingerZ.com>
Subject couple of problems exposed under heavy load
Date Sun, 01 Jul 2001 20:52:20 GMT
heya. i recently got my tomcat-catalina and my apache talking to each
other, hurrah. i took the opportunity to load test my cocoon webapp.
overall, it held up pretty nicely, but when i cranked up the concurrency,
i started getting some exceptions here and there. one was:

DEBUG   28325   [cocoon  ] (Ajp13Processor[8009][10]): UnnamedSelector:
ComponentSelector could not access the Component for hint: html
java.lang.Exception: Could not create enough Components to service your
request.
        at
org.apache.avalon.excalibur.pool.DefaultPool.get(DefaultPool.java:135)
        at
org.apache.avalon.excalibur.component.PoolableComponentHandler.get(PoolableComponentHandler.java:117)
        at
org.apache.avalon.excalibur.component.ExcaliburComponentSelector.select(ExcaliburComponentSelector.java:246)
        at
org.apache.cocoon.sitemap.SitemapComponentSelector.select(SitemapComponentSelector.java:49)

another was:

WARN    27933   [cocoon  ] (Ajp13Processor[8009][4]): Pool interrupted
while waiting for lock.
java.lang.NullPointerException
        at
com.webslingerZ.cocoon2.transformation.InspectionTransformer.recycle(InspectionTransformer.java:82)
        at
org.apache.avalon.excalibur.pool.DefaultPool.put(DefaultPool.java:169)
        at
org.apache.avalon.excalibur.component.PoolableComponentHandler.put(PoolableComponentHandler.java:131)
        at
org.apache.avalon.excalibur.component.ExcaliburComponentSelector.release(ExcaliburComponentSelector.java:350)

(which is probably my bug, but i thought the 'Pool interrupted while
waiting for lock' message was strange)

and another one of these:

DEBUG   27779   [cocoon  ] (Ajp13Processor[8009][4]): UnnamedSelector:
ComponentSelector could not access the Component for hint: xslt
java.lang.Exception: Could not create enough Components to service your
request.
        at
org.apache.avalon.excalibur.pool.DefaultPool.get(DefaultPool.java:135)
        at
org.apache.avalon.excalibur.component.PoolableComponentHandler.get(PoolableComponentHandler.java:117)
        at
org.apache.avalon.excalibur.component.ExcaliburComponentSelector.select(ExcaliburComponentSelector.java:246)
        at
org.apache.cocoon.sitemap.SitemapComponentSelector.select(SitemapComponentSelector.java:49)

avalon guys, do you have any suggestions for settings i could tweak to try
to make the component handlers scale up a bit more?

- donald


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