[rabbitmq-discuss] RabbitMQ writes non stop to disk
Raphael Simon
raphael at rightscale.com
Tue Oct 25 02:07:52 BST 2011
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,
{[],[],[],[],[],[],[],[],[],[],[],[],[],[],
[],[]},
{{[],[],[],[],[],[],[],[],[],[],[],[],[],[],
[],[]}}}}}]}]]}
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