Disable istat logging by default
--------------------------------
Key: DERBY-5086
URL: https://issues.apache.org/jira/browse/DERBY-5086
Project: Derby
Issue Type: Improvement
Components: Services
Affects Versions: 10.8.0.0
Reporter: Knut Anders Hatlen
Assignee: Knut Anders Hatlen
The automatic index statistics daemon will by default log what it's doing. That
means messages like these ones will be written to derby.log during normal
operation:
Wed Mar 02 13:36:22 CET 2011 Thread[main,5,main] {istat} "APP"."T": update
scheduled - 23ce809c-012e-7691-6c29-000003480128 reason=[no stats,
row-estimate=36167] (queueSize=1)
Wed Mar 02 13:36:22 CET 2011 Thread[index-stat-thread,5,main] {istat}
"APP"."T": generating index statistics
Wed Mar 02 13:36:23 CET 2011 Thread[index-stat-thread,5,main] {istat}
"APP"."T": generation complete (509 ms)
Wed Mar 02 13:36:23 CET 2011 Thread[main,5,main] {istat} stopping daemon,
active=false, work/age=510/14736 [q/p/s=0/1/1,err:k/u/c=0/0/0,rej:f/d/o=0/0/0]
Although these messages may be helpful in diagnosing bugs, they may also be a
source of confusion since users probably only expect errors/problems to be
logged by default. Also, for some workloads, large quantities of log may be
produced and take up disk space. Therefore, I think we should disable the
logging before the 10.8 release, and instead instruct users who experience
problems to enable logging manually with the derby.storage.indexStats.log
property.
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