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From "tom liu (JIRA)" <j...@apache.org>
Subject [jira] Created: (SOLR-2147) NPE throws in ShardDoc's ShardFieldSortedHitQueue when Distributed Searching
Date Sat, 09 Oct 2010 10:01:42 GMT
NPE throws in ShardDoc's ShardFieldSortedHitQueue when Distributed Searching
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                 Key: SOLR-2147
                 URL: https://issues.apache.org/jira/browse/SOLR-2147
             Project: Solr
          Issue Type: Bug
    Affects Versions: 4.0
         Environment: JDK1.6/Tomcat6
            Reporter: tom liu


when distributed searching use katta components(solr-1395), throws NPE:
Oct 9, 2010 5:43:59 PM org.apache.solr.common.SolrException log
SEVERE: java.lang.NullPointerException
        at org.apache.solr.handler.component.ShardFieldSortedHitQueue$1.compare(ShardDoc.java:210)
        at org.apache.solr.handler.component.ShardFieldSortedHitQueue.lessThan(ShardDoc.java:134)
        at org.apache.lucene.util.PriorityQueue.upHeap(PriorityQueue.java:221)
        at org.apache.lucene.util.PriorityQueue.add(PriorityQueue.java:130)
        at org.apache.lucene.util.PriorityQueue.insertWithOverflow(PriorityQueue.java:146)
        at org.apache.solr.handler.component.QueryComponent.mergeIds(QueryComponent.java:555)
        at org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:408)
        at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:304)
        at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131)
        at org.apache.solr.katta.SolrKattaServer.request(SolrKattaServer.java:97)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)

i found that sharddoc.java 210 was :
        final float f1 = e1.score;
        final float f2 = e2.score;
score field is Float type, it may be null. so should be changed as:
        final float f1 = e1.score==null?0.00f:e1.score;
        final float f2 = e2.score==null?0.00f:e2.score;


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