[rabbitmq-discuss] RabbitMQ failure under high load

[Michał Kiędyś]

Hi,

Software version: 2.8.2
The cluster has been stressed with 1000 writers and 100 readers. Message
size is 100kB.
Test configuration:

*readers node #1*
test.ConnectionPerWorker=true
test.WritersCount=0
test.ReadersCount=33
test.Durable=true
test.QueuesCount=1
test.AutoAck=false
test.ExchangeType=direct
test.QueueNamePrefix=direct
test.Host=arch-task-mq-7.atm

*readers node #2*
test.ConnectionPerWorker=true
test.WritersCount=0
test.ReadersCount=33
test.Durable=true
test.QueuesCount=1
test.AutoAck=false
test.ExchangeType=direct
test.QueueNamePrefix=direct
test.Host=arch-task-mq-8.atm

*readers node #3*
test.ConnectionPerWorker=true
test.WritersCount=0
test.ReadersCount=33
test.Durable=true
test.QueuesCount=1
test.AutoAck=false
test.ExchangeType=direct
test.QueueNamePrefix=direct
test.Host=arch-task-mq-8.atm

*writers node #4*
test.ConnectionPerWorker=true
test.WritersCount=333
test.ReadersCount=0
test.Durable=true
test.QueuesCount=1
test.AutoAck=false
test.ExchangeType=direct
test.QueueNamePrefix=direct
test.BodySize=102400
# available units: s(seconds), m(minutes), h(hours) d(days)
test.TestDuration=3h
test.Host=arch-task-mq-8.atm

writers node #5
test.ConnectionPerWorker=true
test.WritersCount=333
test.ReadersCount=0
test.Durable=true
test.QueuesCount=1
test.AutoAck=false
test.ExchangeType=direct
test.QueueNamePrefix=direct
test.BodySize=102400
# available units: s(seconds), m(minutes), h(hours) d(days)
test.TestDuration=3h
test.Host=arch-task-mq-7.atm

writers node #6
test.ConnectionPerWorker=true
test.WritersCount=334
test.ReadersCount=0
test.Durable=true
test.QueuesCount=1
test.AutoAck=false
test.ExchangeType=direct
test.QueueNamePrefix=direct
test.BodySize=102400
# available units: s(seconds), m(minutes), h(hours) d(days)
test.TestDuration=3h
test.Host=arch-task-mq-8.atm


*Actual tests state:*
Running worker-1000w-100r-100kB
Preparing tests on arch-task-mq-1
Preparing tests on arch-task-mq-2
Preparing tests on arch-task-mq-3
Preparing tests on arch-task-mq-4
Preparing tests on arch-task-mq-5
Preparing tests on arch-task-mq-6
Preparations done, starting testing procedure
Start tests on arch-task-mq-1
Start tests on arch-task-mq-2
Start tests on arch-task-mq-3
Start tests on arch-task-mq-4
Start tests on arch-task-mq-5
Start tests on arch-task-mq-6
Waiting for tests to finish
Tests done on arch-task-mq-5
Tests done on arch-task-mq-6
Tests done on arch-task-mq-4


The readers has been disconnected by the server ahead of time.


*Actual cluster state (data from Management Plugin view):*
Name                    File descriptors (?)           Socket descriptors
(?)           Erlang processes      Memory                      Disk space
    Uptime     Type
                                   (used / available)             (used /
available)                  (used / available)
rabit at arch-task-mq-7    392 / 1024                     334 / 829
                   2885 / 1048576        540.2MB                    49.6GB
         21h 14m  Disc Stats *

                                                                     1.6GB
high watermark 4.0GB low watermark
rabbit at arch-task-mq-8  692 / 1024                     668 / 829
                  5522 / 1048576        1.8GB (?)                  46.1GB
       21h 16m  RAM

                                                                     1.6GB
high watermark 4.0GB low watermark

Number of processes is growing all the time even though no messages are not
published or received.
All publishers has been blocked. After some time I killed the
publisher processes, but RabbitMQ still sees them as connected and blocked.
:)

Some logs:

mkiedys at arch-task-mq-8:/var/log/rabbitmq$ cat
rabbit at arch-task-mq-8.log|grep vm_memory_high|tail -n 20
vm_memory_high_watermark clear. Memory used:1709148224 allowed:1717986918
vm_memory_high_watermark set. Memory used:2135174984 allowed:1717986918
vm_memory_high_watermark clear. Memory used:1593121728 allowed:1717986918
vm_memory_high_watermark set. Memory used:2043534608 allowed:1717986918
vm_memory_high_watermark clear. Memory used:1681947128 allowed:1717986918
vm_memory_high_watermark set. Memory used:2088225952 allowed:1717986918
vm_memory_high_watermark clear. Memory used:1710494800 allowed:1717986918
vm_memory_high_watermark set. Memory used:2208875080 allowed:1717986918
vm_memory_high_watermark clear. Memory used:1713902032 allowed:1717986918
vm_memory_high_watermark set. Memory used:2122564032 allowed:1717986918
vm_memory_high_watermark clear. Memory used:1663616264 allowed:1717986918
vm_memory_high_watermark set. Memory used:2098909664 allowed:1717986918
vm_memory_high_watermark clear. Memory used:1712666136 allowed:1717986918
vm_memory_high_watermark set. Memory used:2088814360 allowed:1717986918
vm_memory_high_watermark clear. Memory used:1640273568 allowed:1717986918
vm_memory_high_watermark set. Memory used:2116966952 allowed:1717986918
vm_memory_high_watermark clear. Memory used:1715305176 allowed:1717986918
vm_memory_high_watermark set. Memory used:2186572648 allowed:1717986918
vm_memory_high_watermark clear. Memory used:1716620504 allowed:1717986918
vm_memory_high_watermark set. Memory used:2180898440 allowed:1717986918

mkiedys at arch-task-mq-8:/var/log/rabbitmq$ cat
rabbit at arch-task-mq-8.log|grep vm_memory_high|wc -l
2935

Why does the server consumes more memory than 1.6GB limit?

Regards,
MK
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