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MXS-1752: Clarify router behavior

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Amended the documentation to specify the exact behavior of the router when
non-resultset results are returned.
This commit is contained in:
Markus Mäkelä
2018-04-24 11:56:22 +03:00
parent 88ae276dd6
commit 2cfa66ff7d
1 changed files with 6 additions and 2 deletions
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8
Documentation/Routers/Cat.md
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@ -15,8 +15,12 @@ parameter of the service. The result will only be completed once all servers
have executed this. have executed this.
All commands executed via this router will be executed on all servers. This All commands executed via this router will be executed on all servers. This
means that an INSERT through the `cat` router will send it to all servers. As means that an INSERT through the `cat` router will send it to all servers. In
the intended use-case of the router is to mainly reduce multiple result sets the case of commands that do not return resultsets, the response of the last
server is sent to the client. This means that if one of the earlier servers
returns a different result, the client will not see it.
As the intended use-case of the router is to mainly reduce multiple result sets
into one, it has no mechanisms to prevent writes from being executed on slave into one, it has no mechanisms to prevent writes from being executed on slave
servers (which would cause data corruption or replication failure). Take great servers (which would cause data corruption or replication failure). Take great
care when performing administrative operations though this router. care when performing administrative operations though this router.