Re: HitCollector not serializable (Bug?)

[Doug Cutting]

The HitCollector-based search API is not meant to work remotely.  To do 
so would involve an RPC-callback for every non-zero score, which would 
be extremely expensive.  Also, just making HitCollector serializable 
would not be sufficient.  You'd also need to pass in a HitCollector 
implementation that subclasses UnicastRemoteObject, so that the 
callbacks can return to the original VM.

So, if you can, it's considerably simpler and more efficient to use 
TopDocs-based search when you're working remotely.

Doug

[EMAIL PROTECTED] wrote:
Hi,

i tried Lucene 1.3 RC1.

There seems to be a bug in
org.apache.lucene.search.RemoteSearchable.search(). 

Here is my code:
   Searchable searcher =
      (Searchable) Naming.lookup(args[0]);
   Analyzer analyzer = new StandardAnalyzer();
   Query query = QueryParser.parse("term", "content", analyzer);
   HitCollector hc = new HitCollector()
   {
      public void collect(int doc, float score)
      {
           //bits.set(doc);
      }
   };
   searcher.search(query, (DateFilter)null, hc);

I'm getting the following exception:

java.rmi.MarshalException: error marshalling arguments; nested exception
 is: java.io.NotSerializableException:
 com.entwickler.lucenebuch.remote.SearchClient$1
         at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:129)
         at org.apache.lucene.search.RemoteSearchable_Stub.search(Unknown
 Source)
         at
 com.entwickler.lucenebuch.remote.SearchClient.main(SearchClient.java:47)
 Caused by: java.io.NotSerializableException:
 com.entwickler.lucenebuch.remote.SearchClient$1
         at
 java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
         at
 java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278) at
 sun.rmi.server.UnicastRef.marshalValue(UnicastRef.java:265) at
 sun.rmi.server.UnicastRef.invoke(UnicastRef.java:124)
This happens because org.apache.lucene.search.HitCollector is not
serializable.
Greetings
Manfred


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