qnd: query cache enhancements:  - reduce the clock sync margin to 10 seconds (the clocks synchronization is very good with NTP)  - increase the max number of objects to 500 (500 compressed entries take only 100K)  - use a dynamic threshold for deciding whether to query the master or slave (according to the current slave lag)
qnd: query cache enhancements:
 - reduce the clock sync margin to 10 seconds (the clocks synchronization is very good with NTP)
 - increase the max number of objects to 500 (500 compressed entries take only 100K)
 - use a dynamic threshold for deciding whether to query the master or slave (according to the current slave lag)


git-svn-id: 8a2ccb88241e16c78017770bc38d91d6d5396a5a@87570 6b8eccd3-e8c5-4e7d-8186-e12b5326b719

matsuu/server,ratliff/server,ivesbai/server,jorgevbo/server,DBezemer/server,doubleshot/server,matsuu/server,gale320/server,jorgevbo/server,jorgevbo/server,ratliff/server,doubleshot/server,gale320/server,gale320/server,DBezemer/server,matsuu/server,kaltura/server,kaltura/server,jorgevbo/server,kaltura/server,gale320/server,matsuu/server,ratliff/server,jorgevbo/server,kaltura/server,gale320/server,DBezemer/server,kaltura/server,jorgevbo/server,jorgevbo/server,ratliff/server,ratliff/server,doubleshot/server,doubleshot/server,DBezemer/server,DBezemer/server,DBezemer/server,ratliff/server,ivesbai/server,ivesbai/server,doubleshot/server,doubleshot/server,doubleshot/server,matsuu/server,ratliff/server,gale320/server,matsuu/server,ratliff/server,ivesbai/server,ivesbai/server,doubleshot/server,jorgevbo/server,gale320/server,DBezemer/server,DBezemer/server,ivesbai/server,gale320/server,ivesbai/server,kaltura/server,ivesbai/server,matsuu/server,matsuu/server