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From "Lionel Cons (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APLO-244) Apollo does not give priority to outgoing messages under stress
Date Fri, 17 Aug 2012 06:28:38 GMT

    [ https://issues.apache.org/jira/browse/APLO-244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13436584#comment-13436584
] 

Lionel Cons commented on APLO-244:
----------------------------------

I've tried fast_delivery_rate="100k" and the situation slightly improves. Instead of no messages
delivered to the consumer, some go through, at the beginning. Then the consumed rate stays
at zero and the produced rate also goes to zero, see the attached graph showing what stomp-benchmark
reported.
                
> Apollo does not give priority to outgoing messages under stress
> ---------------------------------------------------------------
>
>                 Key: APLO-244
>                 URL: https://issues.apache.org/jira/browse/APLO-244
>             Project: ActiveMQ Apollo
>          Issue Type: Improvement
>            Reporter: Lionel Cons
>         Attachments: APLO-244.png, APLO-244.xml
>
>
> Using the stomp-benchmark scenario file attached to APLO-241, one can play with the number
of producers and the overall message rate via the producer_sleep parameter.
> On good hardware, Apollo could handle 60k msg/sec coming from 30k concurrent clients.
This is good!
> However, when the message rate is further increased, Apollo spends most of its time queuing
the messages it cannot deliver (since I have slow_consumer_policy=queue) instead of delivering
them. The end result being that the topic consumer gets no messages at all, making the situation
even worse (bigger message store).
> For instance:
> c_c1 samples: [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
]
> p_p1 samples: [ 275403,208512,241756,238954,241702,269398,362274,390104,437176,408510,459625,454061,447085,454244,419557,413095,235546,76322,40296,12285,2979
> ,1891,1408,1110,866,824,921,909,909,984,988,861,601,332,251,164,165,256,425,495,495,583,660,656,551,783,825,668,680,447,164,165,165,165,165,178,402,329,330,209
]
> e_p1 samples: [ 0,0,0,4,30,0,0,0,0,0,30,1,0,0,3,1,10,15,0,0,3,1,10,12,3,3,2,2,1,21,2,2,1,0,2,10,11,3,2,3,3,10,15,0,2,2,4,2,20,1,2,6,1,2,18,1,2,3,2,3
]
> p_p2 samples: [ 204727,164350,193413,196598,193711,217585,269030,278368,319091,296477,325126,323323,267829,118000,35694,24693,15922,7836,4554,3212,2669,1595,1150,1116,994,538,984,1364,1276,1209,1322,1066,992,771,714,496,495,469,535,620,514,581,568,496,273,359,370,281,186,124,4,0,0,0,0,21,124,123,124,124
]
> e_p2 samples: [ 0,0,0,8,29,1,0,0,0,0,33,2,1,0,1,2,20,11,0,0,0,5,17,9,1,2,3,5,1,21,0,4,5,3,3,10,10,5,3,3,2,14,9,6,6,2,3,3,17,4,4,1,5,1,22,2,4,3,3,9
]
> p_p3 samples: [ 182945,158541,179534,175291,179664,198728,245723,259168,274541,190171,63161,24280,11886,6765,5802,5324,4299,2962,2183,1743,1273,779,424,262,83,0,363,596,596,429,380,397,368,307,1069,992,837,661,503,333,239,174,102,99,14,174,198,123,124,199,104,99,141,198,198,184,79,0,0,0
]
> e_p3 samples: [ 0,0,0,10,32,1,0,0,0,1,39,2,1,0,2,1,21,12,0,1,3,2,21,10,1,2,2,3,3,23,4,2,4,3,1,16,10,2,3,4,2,16,12,4,4,4,4,5,18,3,2,3,10,3,21,1,5,5,5,2
]
> p_p4 samples: [ 195131,164391,192826,184336,187915,206291,212340,103434,19850,7087,4013,3124,2173,2444,2389,1522,1074,1237,1149,820,517,316,197,249,289,176,102,166,84,0,833,892,353,36,332,311,59,0,0,0,0,0,0,0,0,0,0,0,87,332,321,154,0,0,0,12,83,37,0,0
]
> e_p4 samples: [ 0,0,0,3,38,2,0,0,0,0,34,1,0,0,4,2,15,20,0,0,0,3,11,19,3,3,5,4,3,23,0,2,2,3,4,12,14,5,5,3,4,9,13,4,2,4,3,6,24,5,5,2,2,2,20,4,5,3,5,4
]
> Would it be possible to give more priority to the outgoing messages?

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