Solr Restart - Query during warming query leads to exception

[Thomas Schmidt]

Hi,
when I restart my solr server it performs two warming queries.
When a request occures within this there is an exception and always
exceptions until i restart solr.

Logfile:
INFO: Added SolrEventListener:
org.apache.solr.core.QuerySenderListener{queries=[{q=solr,start=0,rows=10},
{q=rocks,start=0,rows=10}, {q=static newSearcher warming query from
solrconfig.xml}]}
INFO: Added SolrEventListener:
org.apache.solr.core.QuerySenderListener{queries=[{q=fast_warm,start=0,rows=10},
{q=static firstSearcher warming query from solrconfig.xml}]}

Is this a known problem?
Does anybody have an advice for a solution?

Thanks
T.

solrconfig.xml:

  <!-- a newSearcher event is fired whenever a new searcher is being
prepared
         and there is a current searcher handling requests (aka registered).
-->
    <!-- QuerySenderListener takes an array of NamedList and executes a
         local query request for each NamedList in sequence. -->
    <listener event="newSearcher" class="solr.QuerySenderListener">
      <arr name="queries">
        <lst> <str name="q">solr</str> <str name="start">0</str> <str
name="rows">10</str> </lst>
        <lst> <str name="q">rocks</str> <str name="start">0</str> <str
name="rows">10</str> </lst>
        <lst><str name="q">static newSearcher warming query from
solrconfig.xml</str></lst>
      </arr>
    </listener>

    <!-- a firstSearcher event is fired whenever a new searcher is being
         prepared but there is no current registered searcher to handle
         requests or to gain autowarming data from. -->
    <listener event="firstSearcher" class="solr.QuerySenderListener">
      <arr name="queries">
        <lst> <str name="q">fast_warm</str> <str name="start">0</str> <str
name="rows">10</str> </lst>
        <lst><str name="q">static firstSearcher warming query from
solrconfig.xml</str></lst>
      </arr>
    </listener>

    <!-- If a search request comes in and there is no current registered
searcher,
         then immediately register the still warming searcher and use it.
If
         "false" then all requests will block until the first searcher is
done
         warming. -->
    <useColdSearcher>false</useColdSearcher>

    <!-- Maximum number of searchers that may be warming in the background
      concurrently.  An error is returned if this limit is exceeded.
Recommend
      1-2 for read-only slaves, higher for masters w/o cache warming. -->
    <maxWarmingSearchers>2</maxWarmingSearchers>