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From:Hendrik Woltersdorf Date:January 29 2010 9:33am
Subject:howto implement a fifo queue in MySQL Cluster ?
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Hi all,

how do I implement a fifo queue in MySQL Cluster ?

What I want to do:

I write inserts and updates to some tables with triggers into a queue.
These rows have to be read and processed in chronological order.
My first attempt was to use a table with an autoincrement column as the
primary key. But tests show, that these autoincrement values are not
inserted in chronological order. A datetime column does not help either,
because it is by far not precise enough, and it depends on the
synchronization of the clocks of the different sql node machines.

Any ideas, how to read these data rows in chronological order ?

The second best idea is, to use "select max(PK)+1", but this will cause
lots of duplicate key errors.

I am using MySQL Cluster version 7.0.7 with 2 data nodes, 2 management
nodes and 2 sql nodes.

kind regards

Hendrik Woltersdorf
Tel.: 0375/27008-580
Tel. mobil: 0178/5710078

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howto implement a fifo queue in MySQL Cluster ?Hendrik Woltersdorf29 Jan
  • Re: howto implement a fifo queue in MySQL Cluster ?Martin Skold29 Jan
    • Antwort: Re: howto implement a fifo queue in MySQL Cluster ?Hendrik Woltersdorf29 Jan
      • Re: Antwort: Re: howto implement a fifo queue in MySQL Cluster ?Martin Skold29 Jan