Optimize step in cron produces "0" Status: Communication Error but still seems to work.

Hi all

My ApacheSolr installation is working just fine except that the daily optimize job returns

"0" Status: Communication Error in apachesolr_cron in the watchdog.

I added some extra logging in _cron to show that it is the optimize step.

The optimize seems to happen successfully. I can see on the Solr statistics page that the optimize count is incremented. I can try optimize directly using curl and that seems to work nicely too and returns a 200 http response and status 0 in the XML.

Any ideas? Is there any potential problem if optimize runs while there are uncommited adds?

I'm using the embedded Jetty. I might try Tomcat.

Thanks