From: Vicky Risk Date: Thu, 24 Jun 2021 18:55:39 +0000 (+0000) Subject: [#1892] Update install.rst X-Git-Tag: Kea-1.9.9~32 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ef8a5b169831d54c575e059d962e3838f4bac267;p=thirdparty%2Fkea.git [#1892] Update install.rst --- diff --git a/doc/sphinx/arm/install.rst b/doc/sphinx/arm/install.rst index 49cbadf46c..73218a96ed 100644 --- a/doc/sphinx/arm/install.rst +++ b/doc/sphinx/arm/install.rst @@ -651,7 +651,7 @@ to current users to plan a migration. New users should not rely on deprecated fe Cassandra (CQL) Support ----------------------- -Cassandra is a non-relational NoSQL database. Kea added support for CQL lease backend in +Cassandra is a non-relational NoSQL database. Kea added support for the CQL lease backend in Kea 1.1.0-beta1 and the CQL host backend in 1.4.0-beta1. This feature never gained much traction with users, particularly compared to the level of interest in and deployments of the alternatives, MySQL and PostgreSQL. @@ -663,9 +663,9 @@ Cassandra philosophy of data duplication, this would require creating and mainta number of tables. To be specific, there are 36 different types of `get` queries in the DHCPv4 code for the MySQL Configuration Backend. In the worst case, where each query required its own table, this implies a duplication factor of over 70. This would clearly be a very bad design. -When we did the initial MySQL and PostgreSQL designs for the Configuration Backend, we also -attempted to come up with a design for Cassandra. That attempt was a complete failure. -We assessed that Cassandra is simply not the right technology for this task. +When we created the initial MySQL and PostgreSQL designs for the Configuration Backend, we also +attempted to come up with a design for Cassandra. That attempt was a complete failure. We +assessed that Cassandra is simply not the right technology for this task. Another problem with Cassandra is performance. In our performance tests MySQL and PostgreSQL were roughly 5-10 times faster than Cassandra, even though we did not do any special tuning