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From "tom liu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-2147) NPE throws in ShardDoc's ShardFieldSortedHitQueue when Distributed Searching
Date Sun, 10 Oct 2010 03:17:30 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919558#action_12919558
] 

tom liu commented on SOLR-2147:
-------------------------------

i found that in solr, only QueryComponent's mergeIds method, would construct ShardDoc, as:
          ShardDoc shardDoc = new ShardDoc();
          shardDoc.id = id;
          shardDoc.shard = srsp.getShard();
          shardDoc.orderInShard = i;
          Object scoreObj = doc.getFieldValue("score");
          if (scoreObj != null) {
            if (scoreObj instanceof String) {
              shardDoc.score = Float.parseFloat((String)scoreObj);
            } else {
              shardDoc.score = (Float)scoreObj;
            }
          }
But, if scoreObj is null, shardDoc.score must be null.
So,  what about if this is happen?

> NPE throws in ShardDoc's ShardFieldSortedHitQueue when Distributed Searching
> ----------------------------------------------------------------------------
>
>                 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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