[
https://issues.apache.org/jira/browse/IGNITE-4633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894012#comment-15894012
]
Vladimir Ozerov commented on IGNITE-4633:
-----------------------------------------
Looks like my comment about getting participating nodes on clients is wrong.
Instead, we should determine the list of participating nodes as message goes
through the ring, not on coordinator. Otherwise it will be hard to share info
of current schema with concurrently joining nodes.
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
