[rabbitmq-discuss] RECONDITION_FAILED - unknown delivery tag

[macmillan.josh09 at gmail.com]

prefetchCount:1 fixes this issue, but i want to pop items in parallel if 
possible.

On Sunday, May 5, 2013 3:48:47 PM UTC-7, macmilla... at gmail.com wrote:
>
> My Node.js worker crashes (RECONDITION_FAILED - unknown delivery tag) if 
> the following 2 conditions are met: 
>
> 1. I start it AFTER the queue have at least 2 messages. 
> 2. The q.shift() is in an async code.
>
> http://pastebin.com/uMQJn0Fe   
>
>
>    // index.js
>    var amqp = require('amqp');
>     
>    var connection = null;
>     
>    connection = amqp.createConnection({ host: 'foo.com' });
>     
>    connection.on('ready', function () {
>      connection.queue('loc', { durable: true, autoDelete: false}, function
>    (q) {
>        q.bind('main', 'loc');
>        q.subscribe({ack:true, prefetchCount: 0}, function (message,headers
>    , deliveryInfo) {
>          console.log(message);
>          setTimeout(function() { q.shift(); }, 100);
>        });
>      });
>    });
>     
>    my worker crashes only I run it AFTER there are messages in the queue. 
>    if I run the worker BEFORE, everything is ok.
>     
>    I use ab to add 2 messages to the queue:
>    ab -k -n 2 -c 1 -p post-data -T 'application/json' foo-api.com/publish
>     
>    And now run my worker - node index.js
>    here is the outputs:
>     
>    { topic: 'loc',
>      sourceCode: 'LOC',
>      sourceRecordID: '690599224',
>      sourceField: 'Phone',
>      sourceFieldValue: '7572007395',
>      actionCode: 'DISP',
>      actionDescription: 'Disconnected Phone Number' 
>    }
>    { topic: 'loc',
>      sourceCode: 'LOC',
>      sourceRecordID: '690599224',
>      sourceField: 'Phone',
>      sourceFieldValue: '7572007395',
>      actionCode: 'DISP',
>      actionDescription: 'Disconnected Phone Number' 
>    }
>     
>    events.js:72
>            throw er; // Unhandled 'error' event
>                  ^
>    Error: PRECONDITION_FAILED - unknown delivery tag 2
>        at Queue._onMethod (/Users/ogolan/projects/quai-loc/worker/
>    node_modules/amqp/amqp.js:1979:15)
>        at Queue.Channel._onChannelMethod (/Users/ogolan/projects/quai-loc/
>    worker/node_modules/amqp/amqp.js:1557:14)
>        at Connection._onMethod (/Users/ogolan/projects/quai-loc/worker/
>    node_modules/amqp/amqp.js:1088:28)
>        at AMQPParser.parser.onMethod (/Users/ogolan/projects/quai-loc/
>    worker/node_modules/amqp/amqp.js:897:12)
>        at AMQPParser._parseMethodFrame (/Users/ogolan/projects/quai-loc/
>    worker/node_modules/amqp/amqp.js:451:10)
>        at frameEnd (/Users/ogolan/projects/quai-loc/worker/node_modules/
>    amqp/amqp.js:192:16)
>        at frame (/Users/ogolan/projects/quai-loc/worker/node_modules/amqp/
>    amqp.js:177:14)
>        at AMQPParser.header [as parse] (/Users/ogolan/projects/quai-loc/
>    worker/node_modules/amqp/amqp.js:163:14)
>        at AMQPParser.execute (/Users/ogolan/projects/quai-loc/worker/
>    node_modules/amqp/amqp.js:236:21)
>        at Connection.<anonymous> (/Users/ogolan/projects/quai-loc/worker/
>    node_modules/amqp/amqp.js:935:14)
>    
>
>
>
> any ideas?
>
>
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