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ZeroMQ is a messaging library that allows you to easily build complex
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communication systems. The ZeroMQ plugin allows drizzle to publish
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transactions to a local PUB socket. Many clients can subscribe to
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these transactions. The first frame of the message sent out is the
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schema name the transaction touched - this enables clients to only
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subscribe to the interesting schemas (note that certain "transactions"
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are without a schema, like SET xyz for example, for these, the first
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First, install zeromq, get the code from `zeromq.org
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<http://zeromq.org>`_, then you can build drizzle, watch the
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./configure output to verify that drizzle finds the libraries needed.
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Now you are good to go, simply start drizzle with --plugin-add=zeromq
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and drizzle will start publishing transactions. The only configuration
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parameter available is:
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--zeromq.endpoint arg (=tcp://*:9999) - the endpoint to expose.
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Now you can write a simple python script to verify that it works,
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something like this will work:
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.. code-block:: python
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s = ctx.socket(zmq.SUB)
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s.setsockopt(zmq.SUBSCRIBE, '')
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s.connect('tcp://localhost:9999')
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and then you can generate some load:
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bin/drizzleslap -c 10 -a --auto-generate-sql-add-autoincrement --burnin
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which creates 10 threads and generates random queries.
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plugin/zeromq/docs/index.rst
