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From CameronL <cameron.develo...@gmail.com>
Subject LRUCache causing locked threads
Date Mon, 15 Jun 2009 18:39:42 GMT

I've searched through the forums and seen a few similar problems to this, but
nothing that seemed to help much.  

We're running Solr 1.3 on Tomcat 6.0.16 and Java 6.  We've been having
performance problems with our search, causing long query times under normal
traffic.  We've taken a thread dump and have seen many threads locked or
waiting for LRUCache (see below).  Our cache values are as follows:

<filterCache class="solr.LRUCache" size="20000" initialSize="10000"
autowarmCount="10000"/>
<queryResultCache class="solr.LRUCache" size="20000" initialSize="10000"
autowarmCount="5000"/>
<documentCache class="solr.LRUCache" size="25000" initialSize="10000"
autowarmCount="0"/>


"http-8983-99" daemon prio=10 tid=0x0000002beb3f5800 nid=0x2fb9 waiting for
monitor entry [0x0000000047ea5000..0x0000000047ea6c30]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at org.apache.solr.search.LRUCache.get(LRUCache.java:130)
        - waiting to lock <0x0000002a9fb94be8> (a
org.apache.solr.search.LRUCache$1)
        at
org.apache.solr.search.SolrIndexSearcher.getPositiveDocSet(SolrIndexSearcher.java:605)
        at
org.apache.solr.search.SolrIndexSearcher.numDocs(SolrIndexSearcher.java:1556)
        at
org.apache.solr.request.SimpleFacets.getFacetTermEnumCounts(SimpleFacets.java:377)
        at
org.apache.solr.request.SimpleFacets.getTermCounts(SimpleFacets.java:156)
        at
org.apache.solr.request.SimpleFacets.getFacetFieldCounts(SimpleFacets.java:182)
        at
org.apache.solr.request.SimpleFacets.getFacetCounts(SimpleFacets.java:96)
        at
org.apache.solr.handler.component.FacetComponent.process(FacetComponent.java:70)
        at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:169)
        at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:1204)
        at
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:303)
        at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:232)
"http-8983-83" daemon prio=10 tid=0x0000002bead1a000 nid=0x2f76 waiting for
monitor entry [0x0000000046e95000..0x0000000046e96c30]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at org.apache.solr.search.LRUCache.get(LRUCache.java:130)
        - locked <0x0000002a9fb94be8> (a org.apache.solr.search.LRUCache$1)
        at
org.apache.solr.search.SolrIndexSearcher.getPositiveDocSet(SolrIndexSearcher.java:605)
        at
org.apache.solr.search.SolrIndexSearcher.numDocs(SolrIndexSearcher.java:1556)
        at
org.apache.solr.request.SimpleFacets.getFacetTermEnumCounts(SimpleFacets.java:377)
        at
org.apache.solr.request.SimpleFacets.getTermCounts(SimpleFacets.java:156)
        at
org.apache.solr.request.SimpleFacets.getFacetFieldCounts(SimpleFacets.java:182)
        at
org.apache.solr.request.SimpleFacets.getFacetCounts(SimpleFacets.java:96)
        at
org.apache.solr.handler.component.FacetComponent.process(FacetComponent.java:70)
        at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:169)
        at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:1204)
        at
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:303)
        at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:232)

Has anyone else experienced this or does anyone have an idea of why this
might be happening?
-- 
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