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From Timothy Bish <tabish...@gmail.com>
Subject Re: KAHADB clean up old log files
Date Thu, 22 Sep 2016 12:50:55 GMT
On 09/22/2016 08:39 AM, Steve Hill wrote:
> After the comment about the TOPIC I decided to take a quick look at 
> that in the web interface (just to make sure nothing had gone awry)  
> In deed one of our "queues" had been created as a topic, not sure why 
> as we use the same code to connect to the queues however once removed 
> most of the data files vanished.
>
> Under the topics there are several activemq.advisory.xyz topics. Could 
> these be the source of the remaining kahadb log files that still remain?

No, Advisory destinations do not allow durable subscriptions so if 
there's no consumer the message sent to that Topic essentially goes to 
/dev/null

>
> I am now down to three data files that should not be there. (db-980, 
> db-1329, and db-1438)
>
> -rw-r--r--. 1 activemq activemq 33554432 Aug  8 14:00 db-980.log
> -rw-r--r--. 1 activemq activemq   527645 Sep 19 19:11 db-1329.log
> drwxr-xr-x. 5 activemq activemq     4096 Sep 20 14:57 ..
> -rw-r--r--. 1 activemq activemq        8 Sep 21 13:17 lock
> -rw-r--r--. 1 activemq activemq 33553518 Sep 21 21:52 db-1438.log
> drwxr-xr-x. 2 activemq activemq    12288 Sep 22 08:20 .
> -rw-r--r--. 1 activemq activemq  3287296 Sep 22 08:34 db.redo
> -rw-r--r--. 1 activemq activemq 12357632 Sep 22 08:34 db.data
> -rw-r--r--. 1 activemq activemq 33554432 Sep 22 08:34 db-1456.log
>
> From kahadb logs
>
>  2016-09-22 08:31:07,503 [eckpoint Worker] TRACE 
> MessageDatabase                - gc candidates: [1329]
>  2016-09-22 08:31:07,504 [eckpoint Worker] TRACE 
> MessageDatabase                - ackMessageFileMap: {1329=[980], 
> 1438=[], 1456=[]}
>  2016-09-22 08:31:07,504 [eckpoint Worker] TRACE 
> MessageDatabase                - not removing data file: 1329 as 
> contained ack(s) refer to referenced file: [980]
>  2016-09-22 08:31:07,505 [eckpoint Worker] TRACE 
> MessageDatabase                - Not yet time to check for compaction: 
> 7 of 10 cycles
>  2016-09-22 08:31:07,505 [eckpoint Worker] DEBUG 
> MessageDatabase                - Checkpoint done.
>
> Thanks!
> Steve.
>
> On 9/22/16 8:14 AM, Steve Hill wrote:
>> Chris/Tim:
>>
>> Thanks for the ideas.  Unfortunately neither are the case in our 
>> situation.  The web client shows 0 messages in any of our queues and 
>> we are not using topics.  We did set up the remote debug port and 
>> downloaded the source code if there is anything useful to further 
>> troubleshoot that could be gleaned from there?
>>
>> Thanks!
>> Steve.
>>
>>
>> The most likely place for you to have old messages laying around is 
>> in the
>> DLQ.  The next most likely place is on a topic for an offline (and never
>> coming back) durable subscriber.
>>
>> Tim
>>
>> On Sep 20, 2016 2:02 PM, "Christopher Shannon" <
>> christopher.l.shannon@gmail.com> wrote:
>>
>> Do you have old messages laying around?  KahaDB can't clean up old 
>> journal
>> files if there are messages scattered throughout the logs.  Even a 
>> single
>> unacked message means that a journal file (and the future files) 
>> can't be
>> cleaned up. This situation tends to happen either when there are old
>> messages not being acked quick enough or there are different 
>> destinations
>> with different speeds.  Ie if one queue has a very slow message rate and
>> another queue has a high message rate.
>>
>> Assuming there isn't some sort of bug with the GC process then one 
>> way to
>> help lower the usage would be to split up destinations into different
>> stores using multiKahaDB.  Take a look at Gary's blog post on this:
>> http://blog.garytully.com/2011/11/activemq-multiple-kahadb-instances.html 
>>
>>
>>
>> On Tue, Sep 20, 2016 at 1:04 PM, Hill, Steve <SHill@armada.net> wrote:
>>
>>> Hi fellow ActiveMQ users!
>>>
>>> I have searched all over the internet and can not find a solution to a
>>> problem we are experiencing where old log files are not removed from
>>> KAHADB.  Needless to say we uncovered this problem when we exceeded the
>>> size of our persistent store in production :-)
>>>
>>> We are using client side acknowledgement for all reads from the 
>>> Queue and
>>> have restarted all clients and also ActiveMQ numerous times, yet the
>>> messages do not get removed.  We are also using the network 
>>> connector to
>>> move messages to the queue that has an active consumer.  We were using
>>> 5.13.0 but moved to 5.14.0 on the hope it might address this problem.
>>>
>>> Follows are some more detailed messages; does anyone have an idea 
>>> how we
>>> can resolve this problem?
>>>
>>> KAHADB logging is enabled and we see the following messages in the log
>>> file.
>>>
>>>
>>>  2016-09-20 08:59:10,207 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1278 as contained ack(s) refer to
>>> referenced file: [1278, 1277]
>>>
>>>  2016-09-20 08:59:10,207 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1279 as contained ack(s) refer to
>>> referenced file: [674]
>>>
>>>  2016-09-20 08:59:10,208 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1280 as contained ack(s) refer to
>>> referenced file: [691]
>>>
>>>  2016-09-20 08:59:10,208 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1281 as contained ack(s) refer to
>>> referenced file: [699]
>>>
>>>  2016-09-20 08:59:10,209 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1282 as contained ack(s) refer to
>>> referenced file: [699]
>>>
>>>  2016-09-20 08:59:10,210 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1283 as contained ack(s) refer to
>>> referenced file: [705]
>>>
>>>  2016-09-20 08:59:10,210 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1284 as contained ack(s) refer to
>>> referenced file: [711]
>>>
>>>  2016-09-20 08:59:10,211 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1288 as contained ack(s) refer to
>>> referenced file: [674]
>>>
>>>  2016-09-20 08:59:10,211 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1289 as contained ack(s) refer to
>>> referenced file: [790]
>>>
>>>  2016-09-20 08:59:10,212 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1290 as contained ack(s) refer to
>>> referenced file: [1290, 1278]
>>>
>>>  2016-09-20 08:59:10,213 [eckpoint Worker] TRACE MessageDatabase
>>>       - not removing data file: 1291 as contained ack(s) refer to
>>> referenced file: [790]
>>>
>>> The files at this point are months old.
>>>
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 14 21:23 db-674.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 16 01:57 db-691.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 17 02:10 db-699.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 18 03:55 db-705.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 19 01:32 db-711.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 25 15:15 db-790.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 26 10:32 db-858.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 27 00:19 db-865.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 27 03:03 db-866.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 28 01:45 db-877.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 29 01:18 db-888.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 30 02:10 db-899.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Jul 31 01:11 db-904.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  1 00:19 db-909.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  1 04:42 db-910.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  2 01:07 db-918.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  3 01:38 db-930.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  4 00:19 db-939.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  4 03:16 db-940.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  5 00:23 db-949.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  6 02:42 db-960.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  7 02:18 db-968.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  8 00:44 db-975.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  8 14:00 db-980.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  8 15:41 db-981.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug  9 01:43 db-1051.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 11 00:20 db-1066.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 11 03:01 db-1067.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 12 00:19 db-1074.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 12 03:05 db-1075.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 13 00:19 db-1082.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 13 03:04 db-1083.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 14 01:06 db-1093.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 15 01:18 db-1111.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 16 02:38 db-1126.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 17 00:19 db-1137.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 17 02:32 db-1138.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 18 00:21 db-1155.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Aug 19 00:51 db-1167.log
>>>
>>> -rw-r--r--. 1 activemq activemq 33554432 Sep 19 13:42 db-1277.log
>>>
>>> -rw-r--r--. 1 activemq activemq   597139 Sep 19 14:59 db-1279.log
>>>
>>> Thanks!
>>>
>>> Steve Hill
>>>
>>> ARMADA
>>>
>>>
>>>
>>>
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>>
>>
>>
>
>


-- 
Tim Bish
twitter: @tabish121
blog: http://timbish.blogspot.com/


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