Fall 2016 QServ and Data Access Highlights

  • Query analysis fixes (more robust handling of ORDER BY, fix for missed usages of chunk/subchunk secondary index to limit query dispatch to involved chunks).
  • Shared scan improvements (fixes for “snail scan” long-running outlier query scan, scan table memory locking fixes/improvements).
  • Many containerization improvements (container sizes reduced by removing mariadb unit tests and intermediate compilation products, container-host timezone sync, more robust build and deploy scripts).
  • Database connection management fixes for wmgr service to enable parallelized usage of qserv loader script.
  • XRootD now logs via the LSST log package.