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You're correct, scisql is not installed. At the same time, the chunkQueries are not reaching the workers (no chunk query execution error--doesn't get that far), so there is also an xrootd related issue. I see that scisql has dependencies MySQLdb and Mako. Perhaps I should install all three of these within my qserv sandbox. Is there an obvious reason why these aren't included as part of the standard qserv build? Thanks, Bill On Sep 4, 2013, at 9:34 PM, Serge Monkewitz <[log in to unmask]> wrote: > Hi Bill, > > In general, if you get an error like "read/write failed for chunks foo, bar, baz", you should check the worker xrootd log to see the underlying chunk query execution error. > > Totally guessing here, but it looks to me like all the failed queries contain scisql_ UDF calls, and all the (semi-) successful ones don't. Is it possible you didn't install scisql for the worker mysql instances? > > Cheers, > Serge ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the QSERV-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=QSERV-L&A=1