The FAST ESP error, Document summary too short, couldn't unpack, occasionally occurs after performing an index profile update. In the past, my solution to this problem involved executing a manual cold update. While this works every time, it does require that you refeed all of your content. Definitely not the ideal solution when dealing with a production system.
I discovered a TechNet posting this morning that offers another solution that's not destructive. The following are the steps described in the post:
- Stop the QR Server (
nctrl stop qrserver). - Delete the
%FASTSEARCH%\var\qrserver\webcluster\15100\cache_csdirectory. - Start the QR Server (
nctrl start qrserver). - Stop Search (
nctrl stop search-1). - Delete the
%FASTSEARCH%\var\searchctrldirectory. - Start Search (
nctrl start search-1) - Repeat the above steps on any systems in the cluster running a QR Server or Search component.
A big thanks to Rob Va for the solution!