[rabbitmq-discuss] RabbitMQ writes non stop to disk
Aaron Westendorf
aaron at agoragames.com
Tue Oct 25 16:57:11 BST 2011
Did you disable vm_memory_high_watermark ? I've attached graphs of
our disk usage before and after we enabled it.
-Aaron
On Mon, Oct 24, 2011 at 9:07 PM, Raphael Simon <raphael at rightscale.com> wrote:
> Hello all,
> We are seeing an issue on a production broker where the RabbitMQ process
> writes non stop to files in mnesia/<node>/msg_store_persistent. It keeps
> creating new files and the problem seems to be getting worse. Listing the
> files in that directory shows that it's creating a new 16 MB file every 2 to
> 4 minutes [1].
> The throughput of persistent messages in this broker is orders of magnitude
> less (maybe 20 msg/sec at the most, each being in the 10s of KB) .
> Attaching a shell to the broker process I can retrieve the process status of
> the msg_store_persistent server which is the process causing all the writes,
> not sure what to look for though [2].
> There are about 100 messages sitting in queues on that broker so that should
> not cause that many writes, iostat shows about 6000 writes/s.
> Any pointers to where we should be looking would be greatly appreciated.
> Thanks!
> --
> Raphael.
> [1]
> # ls -alt /mnt/rabbitmq/mnesia/rabbit at broker1-1/msg_store_persistent
> total 453196
> -rw-r--r-- 1 rabbitmq rabbitmq 2973011 2011-10-25 00:55 706.rdq
> drwxr-xr-x 5 rabbitmq rabbitmq 4096 2011-10-25 00:54 ..
> drwxr-xr-x 2 rabbitmq rabbitmq 4096 2011-10-25 00:53 .
> -rw-r--r-- 1 rabbitmq rabbitmq 16779002 2011-10-25 00:49 704.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16779064 2011-10-25 00:44 703.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16778786 2011-10-25 00:39 702.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16780428 2011-10-25 00:33 701.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16779981 2011-10-25 00:28 700.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16779550 2011-10-25 00:24 699.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16780493 2011-10-25 00:21 698.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16777711 2011-10-25 00:17 697.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16782704 2011-10-25 00:13 696.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 8991 2011-10-25 00:10 669.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 8861 2011-10-25 00:10 667.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 10469 2011-10-25 00:10 665.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 54123 2011-10-25 00:10 662.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 61457 2011-10-25 00:10 658.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 6040 2011-10-25 00:10 654.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 13115149 2011-10-25 00:10 634.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16779265 2011-10-25 00:09 695.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16808918 2011-10-25 00:03 694.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16802844 2011-10-24 23:55 690.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16793271 2011-10-24 23:55 689.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16810749 2011-10-24 23:54 688.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16780809 2011-10-24 23:51 683.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16779742 2011-10-24 23:49 682.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16778746 2011-10-24 23:44 681.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16793650 2011-10-24 23:40 680.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16782092 2011-10-24 23:35 679.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16788239 2011-10-24 23:31 678.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16780959 2011-10-24 23:26 677.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16779952 2011-10-24 23:17 675.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16777823 2011-10-24 23:05 672.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16779687 2011-10-24 23:02 671.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 17559554 2011-10-24 20:52 633.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 11847 2011-10-24 20:41 612.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 16100804 2011-10-24 20:41 523.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 11314 2011-10-24 18:39 576.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 28514 2011-10-24 18:16 565.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 17823 2011-10-24 17:24 561.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 14774 2011-10-24 13:25 528.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 10864262 2011-10-24 13:25 0.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 35908 2011-10-24 13:15 491.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 48383 2011-10-24 13:06 487.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 11912 2011-10-24 12:50 484.rdq
> -rw-r--r-- 1 rabbitmq rabbitmq 23881 2011-10-24 06:06 437.rdq
> [2]
> {status,<0.237.0>,
> {module,gen_server2},
> [[{{#Ref<0.0.3588.227656>,fhc_handle},
> {handle,{file_descriptor,prim_file,{#Port<0.712982>,109}},
> 14469207,14469207,false,0,1048576,[],true,
>
> "/mnt/rabbitmq/mnesia/rabbit at broker1-1/msg_store_persistent/702.rdq",
> [raw,binary,write],
> [{write_buffer,1048576}],
> true,false,
> {1319,503146,31340}}},
> {'$ancestors',[rabbit_sup,<0.73.0>]},
>
> {{"/mnt/rabbitmq/mnesia/rabbit at broker1-1/msg_store_persistent/702.rdq",
> fhc_file},
> {file,0,true}},
> {fhc_age_tree,{1,
>
> {{1319,503146,31340},#Ref<0.0.3588.227656>,nil,nil}}},
> {'$initial_call',{gen,init_it,7}}],
> running,<0.74.0>,[],
> [{header,"Status for generic server msg_store_persistent"},
> {data,[{"Status",running},
> {"Parent",<0.74.0>},
> {"Logged events",[]},
> {"Queued messages",[]}]},
> {data,[{"State",
>
> {msstate,"/mnt/rabbitmq/mnesia/rabbit at broker1-1/msg_store_persistent",
> rabbit_msg_store_ets_index,
> {state,262201,
>
> "/mnt/rabbitmq/mnesia/rabbit at broker1-1/msg_store_persistent"},
> 702,#Ref<0.0.3588.227656>,
> {dict,0,16,16,8,80,48,
> {[],[],[],[],[],[],[],[],[],[],[],[],[],[],
> [],[]},
>
> {{[],[],[],[],[],[],[],[],[],[],[],[],[],[],
> [],[]}}},
> [],undefined,53527675,424756530,[],<0.240.0>,
> 266298,258104,270395,
> {set,0,16,16,8,80,48,
>
> {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],
> []},
> {{[],[],[],[],[],[],[],[],[],[],[],[],[],[],
> [],[]}}},
> {dict,24974,6019,8192,4096,30095,18057,
> {[],[],[],[],[],[],[],[],[],[],[],[],[],[],
> [],[]},
>
> {{[[<<109,81,35,172,101,10,100,5,139,235,37,
> 207,134,159,97,123>>|
> {#Fun<rabbit_variable_queue.1.360644>,
>
> #Fun<rabbit_variable_queue.20.77393657>}],
>
> [<<98,60,3,61,105,99,34,128,158,37,55,121,
> 53,68,253,77>>|
> {#Fun<rabbit_variable_queue.1.360644>,
>
> #Fun<rabbit_variable_queue.20.77393657>}],
> [<<224,253,10,145,132,16,186,61,192,63,
> ..... lots of stuff snipped ....
>
> {[],[],[],[],[],[],[],[],[],[],[],[],[],[],
> [],[]},
>
> {[],[],[],[],[],[],[],[],[],[],[],[],[],[],
> [],[]}}},
> false,16777216,
> {dict,0,16,16,8,80,48,
> {[],[],[],[],[],[],[],[],[],[],[],[],[],[],
> [],[]},
>
> {{[],[],[],[],[],[],[],[],[],[],[],[],[],[],
> [],[]}}}}}]}]]}
> _______________________________________________
> rabbitmq-discuss mailing list
> rabbitmq-discuss at lists.rabbitmq.com
> https://lists.rabbitmq.com/cgi-bin/mailman/listinfo/rabbitmq-discuss
>
>
--
Aaron Westendorf
Senior Software Engineer
Agora Games
359 Broadway
Troy, NY 12180
Phone: 518.268.1000
aaron at agoragames.com
www.agoragames.com
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