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From Yonik Seeley <yo...@lucidimagination.com>
Subject Re: LRUCache causing locked threads
Date Mon, 15 Jun 2009 18:51:57 GMT
Solr 1.4 has a cache implementation that's lockless for gets, and
faster for gets.  There's a new faceting implementation as well.

-Yonik
http://www.lucidimagination.com

On Mon, Jun 15, 2009 at 2:39 PM, CameronL<cameron.developer@gmail.com> wrote:
>
> 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?
> --
> View this message in context: http://www.nabble.com/LRUCache-causing-locked-threads-tp24040421p24040421.html
> Sent from the Solr - User mailing list archive at Nabble.com.
>
>

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