[jira] [Closed] (IGNITE-4633) Initiate DDL operation through custom discovery message

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-4633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov closed IGNITE-4633.
-----------------------------------

> Initiate DDL operation through custom discovery message
> -------------------------------------------------------
>
>                 Key: IGNITE-4633
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4633
>             Project: Ignite
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Vladimir Ozerov
>            Assignee: Alexander Paschenko
>             Fix For: 2.0
>
>
> Design considerations:
> 1) Create generic DDL custom discovery message pair - {{INIT}} and {{ACK}} messages - which will hold concrete DDL commands.
> 2) Originator must generate unique message ID to be able to track it later.
> 3) Coordinator calculates all participants through affinity API and adds them to message.
> 4) {{INIT}} message goes through the ring and:performs some fast preliminary checks if necessary and collects error; in particular it may verify whether schema change is valid to allow for fail-fast client notification.;
> 5) If at least one error occurs during {{INIT}} stage, originator may throw exception to the user.
> 6) {{ACK}} message schedules asynchronous execution of the command.



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