f90b36d745
Improve dbreco.rst based on suggestions from eglynn Add remark about availability of compute meters in measurements.rst Change-Id: I42cc3fe27cd9dab97c6c2353326c69577eb0f7cd
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Copyright 2013 Nicolas Barcet for eNovance
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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=============================
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Choosing a database backend
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=============================
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Selecting a database backend for Ceilometer should not be done lightly for
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numerous reasons:
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1. Not all backend drivers are equally implemented and tested. To help you
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make your choice, the table below will give you some idea of the
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status of each of the drivers available in trunk. Note that we do welcome
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patches to improve completeness and quality of drivers.
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2. It may not be a good idea to use the same host as another database as
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Ceilometer can generate a LOT OF WRITES. For this reason it is generally
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recommended, if the deployment is targeting going into production, to use
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a dedicated host, or at least a VM which will be migratable to another
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physical host if needed. The following spreadsheet can help you get an
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idea of the volumes that ceilometer can generate:
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`Google spreadsheet <https://docs.google.com/a/enovance.com/spreadsheet/ccc?key=0AtziNGvs-uPudDhRbEJJOHFXV3d0ZGc1WE9NLTVPX0E#gid=0>`_
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3. If you are relying on this backend to bill customers, you will note that
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your capacity to generate revenue is very much linked to its reliability,
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which seems to be a factor dear to many managers.
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The following is a table indicating the status of each database drivers:
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================== ============= ================= ==============
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Driver API Complete Storage Complete Production Use
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================== ============= ================= ==============
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MongoDB Yes Yes Multiple
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mysql, postgresql No Yes None known
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HBASE No Yes None known
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================== ============= ================= ==============
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