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Posted to issues@activemq.apache.org by "Rural Hunter (JIRA)" <ji...@apache.org> on 2018/03/23 07:21:00 UTC
[jira] [Created] (AMQ-6936) Dead loop on log file reading

Rural Hunter created AMQ-6936:
---------------------------------

             Summary: Dead loop on log file reading
                 Key: AMQ-6936
                 URL: https://issues.apache.org/jira/browse/AMQ-6936
             Project: ActiveMQ
          Issue Type: Bug
          Components: KahaDB
    Affects Versions: 5.13.4
            Reporter: Rural Hunter


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:
 # The dead loop is in Journal.getNextLocation(Location location)
 # I added log in the method and this is I got:
2018-03-23 14:56:43 [DEBUG] Journal Location 7:33554239: offset=33554239, size=91, type=1
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
 # 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.



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