[KARAF-3075] AdminService should avoid writing file in case just read instance status

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.1, 2.3.5
• Fix Version/s: 2.4.0, 3.0.2, 2.3.10, 4.0.0.M2, 4.0.0.M3
• Component/s: karaf
• Assignee: Freeman Fang
• Reporter: Freeman Fang
• Created: 27/Jun/14 02:55
• Updated: 15/Sep/18 05:03
• Resolved: 18/Dec/14 04:13

Description

For an instance, admin:list will write underlying cfg file 9 times for each instance, that said, if we have 3 child instance with 1 root instance, "admin:list" will cause 36 times file write which is a significant performance lost as well as more chance to corrupt the cfg file.

For some operations in AdminService like get***Port, getInstance, getStatus, which are read-only operations, we should avoid writing back to the cfg file after read

Issue Links

• is duplicated by: KARAF-3218 Sometimes instance.properties or org.apache.karaf.management.cfg or org.apache.karaf.shell.cfg becomes zero size or contents are not fully populated