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From itelleria <telle...@gmail.com>
Subject Meaning of log "not removing data file"
Date Mon, 23 Apr 2018 10:41:04 GMT
Hi,

We are having some issues with kahadb. We see that some journal files, named
"db-", are not removed and this makes ActiveMQ to use a lot of disk space. 

We've activated ActiveMQ logs and there are some logs with this information:

 2018-04-23 11:32:52,218 [eckpoint Worker] TRACE MessageDatabase               
- not removing data file: 348 as contained ack(s) refer to referenced file:
[348, 234]
 2018-04-23 11:32:52,218 [eckpoint Worker] TRACE MessageDatabase               
- not removing data file: 357 as contained ack(s) refer to referenced file:
[356, 357]
 2018-04-23 11:32:52,218 [eckpoint Worker] TRACE MessageDatabase               
- not removing data file: 369 as contained ack(s) refer to referenced file:
[368, 369]
 2018-04-23 11:32:52,218 [eckpoint Worker] TRACE MessageDatabase               
- not removing data file: 370 as contained ack(s) refer to referenced file:
[369, 370]
 2018-04-23 11:32:52,218 [eckpoint Worker] TRACE MessageDatabase               
- not removing data file: 371 as contained ack(s) refer to referenced file:
[370, 371]
 2018-04-23 11:32:52,218 [eckpoint Worker] TRACE MessageDatabase               
- not removing data file: 372 as contained ack(s) refer to referenced file:
[372, 371]
 2018-04-23 11:32:52,218 [eckpoint Worker] TRACE MessageDatabase               
- not removing data file: 396 as contained ack(s) refer to referenced file:
[396, 395]

I know that a journal file is not removed until all its messaged are ACKed.
However, I don't understand the meaning of this message:  *not removing data
file: X as contained ack(s) refer to referenced file: [X, Y]* Apparently the
journal file with X id is not removed because it contains messages with
references to another journal file. I don't understand how this can be
possible. 

I've searched information about this message but I haven't found a clear
answer. Could you point me to a resource with information about this?

Thanks in advance.

IƱigo



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