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From Joe <joe.pol...@gmail.com>
Subject Occasional, unpredictable exceptions with multi-threaded solrj queries
Date Thu, 10 Jan 2013 20:03:02 GMT
I have a multi-threaded application using solrj 4. There are a maximum of 25
threads. Each thread creates a connection using HttpSolrServer, and runs one
query. Most of the time this works just fine. But occasionally I get the
following exception: 

    Jan 10, 2013 9:29:07 AM
org.apache.http.impl.client.DefaultRequestDirector     tryConnect
    INFO: I/O exception (java.net.NoRouteToHostException) caught when
connecting    to the target host: Cannot assign requested address
    Jan 10, 2013 9:29:07 AM
org.apache.http.impl.client.DefaultRequestDirector tryConnect
    INFO: Retrying connect
    Exception in thread "main" java.util.concurrent.ExecutionException:
java.lang.NullPointerException
        at
java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
        at java.util.concurrent.FutureTask.get(FutureTask.java:111)

I wrote some code to retry the query, if it fails:

     while(!querySuccess && queryAttempts<m_MaxQueryAttempts ){
			     try{
			    	 queryAttempts++;
					 rsp = m_Server.query( query );
					 querySuccess = true;
				 }catch(SolrServerException e){
					 querySuccess = false;
				 }
			 }

After one or more retries the query usually works. But sometimes it fails
even after 100 retries. Either way, I'd like to understand what the cause of
the problem is. Why does it work some of the time? Is it an issue with
concurrent access to solr? Apart from this process, I only have one other
process that it continually writing to the index using a single connection.
The default server settings are below - so I don't think it's because of too
many simultaneous connections.

     INFO: Creating new http client,
config:maxConnections=128&maxConnectionsPerHost=32&followRedirects=false 

Any suggestions on how to diagnose this would be much appreciated.



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