[Opensymphony-oscache] OSCache taglib blocking.

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Hi.

We use oscache taglib sorrounding  apache:io-tags in order to include content from other systems in our homepage,

The code looks like this (with debug-comments)
<!-- ec 2 : <%= System.currentTimeMillis() %>  -->
<oscache:cache duration="${externalcontent.cachetime}"  key="${externalcontent.cachekey}">
<!-- ec 3 : <%= System.currentTimeMillis() %>  -->
<io:http url="${externalcontent.externalurl}" action="GET" encoding="${externalcontent.encoding}" />
<!-- ec 4 : <%= System.currentTimeMillis() %>  -->
</oscache:cache>
<!-- ec 5 : <%= System.currentTimeMillis() %>  -->

This jsp has been running for a long time, but last week it started to behave bad.

occationally the timestamp ec2 and ec3 differs my many seconds (from 20 up to several hundreds)

I have a stacktrace from when one of these problems occur. It seems like many threads are waiting for com.opensymphony.oscache.base.EntryUpdateState.
The file is too large to attach.

Many of the resin-threads is in the state of the one below.
the oscache.properties-file is pretty much default. it is attatched

Can someone help me resolving these issues.

Nils Otto

"resin-tcp-connection-*:18126-24679" daemon prio=1 tid=0x2e4391e8 nid=0x4be7 in Object.wait() [14b44000..14b4522c]
	at java.lang.Object.wait(Native Method)
	- waiting on <0x47da2680> (a com.opensymphony.oscache.base.EntryUpdateState)
	at java.lang.Object.wait(Object.java:429)
	at com.opensymphony.oscache.base.Cache.getFromCache(Cache.java:260)
	- locked <0x47da2680> (a com.opensymphony.oscache.base.EntryUpdateState)
	at com.opensymphony.oscache.web.tag.CacheTag.doStartTag(CacheTag.java:486)
	at _jsp._common._level4._externalcontent__jsp._jspService(_externalcontent__jsp.java:70)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:175)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
	at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:926)
	at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:863)
	at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:101)
	at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:137)
	at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:758)
	at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:890)
	at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:460)
	at no.nrk.cm.render.tags.NRKInsertTag.doEndTag(NRKInsertTag.java:153)
	at _jsp._frontpage._level3._frontpage__jsp._jspService(_frontpage__jsp.java:557)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:175)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
	at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:926)
	at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:863)
	at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:101)
	at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:137)
	at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:758)
	at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:890)
	at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:460)
	at _jsp._magazine._level2._main__jsp._jspService(_main__jsp.java:40)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:175)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
	at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:926)
	at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:863)
	at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:101)
	at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:137)
	at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:758)
	at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:890)
	at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:460)
	at _jsp._common._level1._magazine__jsp._jspService(_magazine__jsp.java:76)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:175)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:106)
	at no.nrk.cm.render.filter.TemplateArbitratorFilter.filter(TemplateArbitratorFilter.java:87)
	at no.nrk.cm.render.filter.BaseFilter.doFilter(BaseFilter.java:89)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at no.nrk.cm.render.filter.BaseFilter.doFilter(BaseFilter.java:90)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at no.nrk.cm.render.filter.BaseFilter.doFilter(BaseFilter.java:90)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at no.nrk.cm.render.filter.BaseFilter.doFilter(BaseFilter.java:90)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at com.polopoly.cm.servlet.RequestPreparator.doFilter(RequestPreparator.java:260)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:178)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:268)
	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:389)
	- locked <0x86a83970> (a java.lang.Object)
	at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:507)
	at com.caucho.util.ThreadPool.run(ThreadPool.java:433)
	at java.lang.Thread.run(Thread.java:534)
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# CACHE IN MEMORY
#
# If you want to disable memory caching, just uncomment this line.
#
# cache.memory=false


# CACHE KEY
#
# This is the key that will be used to store the cache in the application
# and session scope.
#
# If you want to set the cache key to anything other than the default
# uncomment this line and change the cache.key
#
# cache.key=__oscache_cache


# USE HOST DOMAIN NAME IN KEY
#
# Servers for multiple host domains may wish to add host name info to
# the generation of the key.  If this is true, then uncomment the
# following line.
#
# cache.use.host.domain.in.key=true


# CACHE LISTENERS
#
# These hook OSCache events and perform various actions such as logging
# cache hits and misses, or broadcasting to other cache instances across a cluster.
# See the documentation for further information.
#
# cache.event.listeners=com.opensymphony.oscache.plugins.clustersupport.JMSBroadcastingListener,  \
#                       com.opensymphony.oscache.extra.CacheEntryEventListenerImpl,               \
#                       com.opensymphony.oscache.extra.CacheMapAccessEventListenerImpl,           \
#                       com.opensymphony.oscache.extra.ScopeEventListenerImpl


# CACHE PERSISTENCE CLASS
#
# Specify the class to use for persistence. If you use the supplied DiskPersistenceListener,
# don't forget to supply the cache.path property to specify the location of the cache
# directory.
# 
# If a persistence class is not specified, OSCache will use memory caching only.
#
# cache.persistence.class=com.opensymphony.oscache.plugins.diskpersistence.DiskPersistenceListener

# CACHE OVERFLOW PERSISTENCE
# Use persistent cache in overflow or not. The default value is false, which means
# the persistent cache will be used at all times for every entry.  true is the recommended setting.
#
# cache.persistence.overflow.only=true

# CACHE DIRECTORY
#
# This is the directory on disk where caches will be stored by the DiskPersistenceListener.
# it will be created if it doesn't already exist. Remember that OSCache must have
# write permission to this directory.
#
# Note: for Windows machines, this needs \ to be escaped
# ie Windows:
# cache.path=c:\\myapp\\cache
# or *ix:
# cache.path=/opt/myapp/cache
#
# cache.path=c:\\app\\cache


# CACHE ALGORITHM
#
# Default cache algorithm to use. Note that in order to use an algorithm
# the cache size must also be specified. If the cache size is not specified,
# the cache algorithm will be Unlimited cache.
#
# cache.algorithm=com.opensymphony.oscache.base.algorithm.LRUCache
# cache.algorithm=com.opensymphony.oscache.base.algorithm.FIFOCache
# cache.algorithm=com.opensymphony.oscache.base.algorithm.UnlimitedCache

# THREAD BLOCKING BEHAVIOR
#
# When a request is made for a stale cache entry, it is possible that another thread is already
# in the process of rebuilding that entry. This setting specifies how OSCache handles the
# subsequent 'non-building' threads. The default behaviour (cache.blocking=false) is to serve
# the old content to subsequent threads until the cache entry has been updated. This provides
# the best performance (at the cost of serving slightly stale data). When blocking is enabled,
# threads will instead block until the new cache entry is ready to be served. Once the new entry
# is put in the cache the blocked threads will be restarted and given the new entry.
# Note that even if blocking is disabled, when there is no stale data available to be served
# threads will block until the data is added to the cache by the thread that is responsible
# for building the data.
#
# cache.blocking=false

# CACHE SIZE
#
# Default cache size in number of items. If a size is specified but not
# an algorithm, the cache algorithm used will be LRUCache.
#
cache.capacity=1000


# CACHE UNLIMITED DISK
# Use unlimited disk cache or not. The default value is false, which means
# the disk cache will be limited in size to the value specified by cache.capacity.
#
# cache.unlimited.disk=false


# JMS CLUSTER PROPERTIES
#
# Configuration properties for JMS clustering. See the clustering documentation
# for more information on these settings.
#
#cache.cluster.jms.topic.factory=java:comp/env/jms/TopicConnectionFactory
#cache.cluster.jms.topic.name=java:comp/env/jms/OSCacheTopic
#cache.cluster.jms.node.name=node1


# JAVAGROUPS CLUSTER PROPERTIES
#
# Configuration properites for the JavaGroups clustering. Only one of these
# should be specified. Default values (as shown below) will be used if niether
# property is set. See the clustering documentation and the JavaGroups project
# (www.javagroups.com) for more information on these settings.
#
#cache.cluster.properties=UDP(mcast_addr=231.12.21.132;mcast_port=45566;ip_ttl=32;\
#mcast_send_buf_size=150000;mcast_recv_buf_size=80000):\
#PING(timeout=2000;num_initial_members=3):\
#MERGE2(min_interval=5000;max_interval=10000):\
#FD_SOCK:VERIFY_SUSPECT(timeout=1500):\
#pbcast.NAKACK(gc_lag=50;retransmit_timeout=300,600,1200,2400,4800;max_xmit_size=8192):\
#UNICAST(timeout=300,600,1200,2400):\
#pbcast.STABLE(desired_avg_gossip=20000):\
#FRAG(frag_size=8096;down_thread=false;up_thread=false):\
#pbcast.GMS(join_timeout=5000;join_retry_timeout=2000;shun=false;print_local_addr=true)
#cache.cluster.multicast.ip=231.12.21.132


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