[AMQ-6936] Dead loop on log file reading

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Duplicate
• Affects Version/s: 5.13.4
• Component/s: KahaDB
• Assignee: Unassigned
• Reporter: Rural Hunter
• Created: 23/Mar/18 07:20
• Updated: 19/Apr/18 15:15
• Resolved: 19/Apr/18 15:15

Description

We restarted our activemq instance(5.13.4) but found it hung on recovering data. I got the data and ran a debug and found these:

1. The dead loop is in Journal.getNextLocation(Location location)
2. I added log in the method and this is I got:
   2018-03-23 14:56:43 [DEBUG] Journal Get next location for: 7:33554239
   2018-03-23 14:56:43 [DEBUG] Journal Reading location: 7:33554330
   2018-03-23 14:56:43 [DEBUG] Journal Location 7:33554330: offset=33554330, size=28, type=2
   2018-03-23 14:56:43 [DEBUG] Journal Reading location: 7:33554358
   2018-03-23 14:56:43 [DEBUG] Journal Location 7:33554358: offset=33554358, size=91, type=1
   2018-03-23 14:56:43 [DEBUG] Journal Get next location for: 7:33554358
   2018-03-23 14:56:43 [DEBUG] Journal Reading location: 7:33554449
   2018-03-23 14:56:43 [DEBUG] Journal Location 7:33554449: offset=33554449, size=0, type=0
   2018-03-23 14:56:43 [DEBUG] Journal Reading location: 7:33554432
   2018-03-23 14:56:43 [DEBUG] Journal Location 7:33554432: offset=33554432, size=0, type=0
   2018-03-23 14:56:43 [DEBUG] Journal Reading location: 7:33554432
   2018-03-23 14:56:43 [DEBUG] Journal Location 7:33554432: offset=33554432, size=0, type=0
   2018-03-23 14:56:43 [DEBUG] Journal Reading location: 7:33554432
   2018-03-23 14:56:43 [DEBUG] Journal Location 7:33554432: offset=33554432, size=0, type=0
   2018-03-23 14:56:43 [DEBUG] Journal Reading location: 7:33554432
   2018-03-23 14:56:43 [DEBUG] Journal Location 7:33554432: offset=33554432, size=0, type=0
   2018-03-23 14:56:43 [DEBUG] Journal Reading location: 7:33554432
   2018-03-23 14:56:43 [DEBUG] Journal Location 7:33554432: offset=33554432, size=0, type=0
3. 33554432 is the max log file size. activemq read a location at the end of the file and the size is 0, this causes the dead loop

I don't know if this is a problem when the file is saved or there is something need to be fixed when reading.