去掉锁以后，同时大量的并发查询出现GC的情况

[muyannian]

2013-09-27 12:14:47 UnInvertedField [ERROR] readFail
java.lang.OutOfMemoryError: GC overhead limit exceeded
at org.apache.solr.request.BigReUsedBuffer$BlockInteger.(BigReUsedBuffer.java:150)
at org.apache.solr.request.BigReUsedBuffer$2.create(BigReUsedBuffer.java:82)
at org.apache.solr.request.BigReUsedBuffer.calloc(BigReUsedBuffer.java:52)
at org.apache.solr.request.uninverted.UnInvertedField.setSingleValue(UnInvertedField.java:76)
at org.apache.solr.request.uninverted.UnInvertedField.uninvert(UnInvertedField.java:280)
at org.apache.solr.request.uninverted.UnInvertedField.(UnInvertedField.java:495)
at org.apache.solr.request.uninverted.UnInvertedField.getUnInvertedField(UnInvertedField.java:532)
at org.apache.solr.request.mdrill.MdrillUtils$UnvertFields.(MdrillUtils.java:168)
at org.apache.solr.request.mdrill.MdrillParseGroupby$fetchContaioner.(MdrillParseGroupby.java:119)
at org.apache.solr.request.mdrill.MdrillParseGroupby.createContainer(MdrillParseGroupby.java:84)
at org.apache.solr.request.mdrill.MdrillGroupBy.get(MdrillGroupBy.java:65)
at org.apache.lucene.index.SegmentReader.invertScan(SegmentReader.java:559)
at org.apache.lucene.index.DirectoryReader.invertScan(DirectoryReader.java:591)
at org.apache.lucene.index.FilterIndexReader.invertScan(FilterIndexReader.java:317)
at org.apache.solr.request.mdrill.FacetComponent.getResult(FacetComponent.java:106)
at org.apache.solr.request.mdrill.FacetComponent.process(FacetComponent.java:81)
at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:101)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1510)
at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:264)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:198)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)

[muyannian]

并发数量要根据单个分区的数据量 而定