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https://issues.apache.org/jira/browse/IGNITE-6318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov closed IGNITE-6318.
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> SQL: Make sure that QueryTypeDescriptorImpl is used in thread-safe manner
> -------------------------------------------------------------------------
>
> Key: IGNITE-6318
> URL: https://issues.apache.org/jira/browse/IGNITE-6318
> Project: Ignite
> Issue Type: Task
> Components: sql
> Affects Versions: 2.3
> Reporter: Vladimir Ozerov
> Priority: Major
>
> {{QueryTypeDescriptorImpl}} is mostly immutable structure. But as we add more
> and more DDL features, it becomes mutable. We need to make sure that it is
> still thread-safe.
> Specifically, when {{CREATE INDEX}} command was implemented, I guarded index
> collection with mutex. Now we added {{ALTER TABLE}} command, and it seems
> that thread-safety for columns was lost.
> I propose to re-use index mutex (rename it to {{stateMux}}) and make sure
> that column collections are also thread-safe. I would also propose to
> consider copy-on-write approach, as these collections are returned by some
> methods as is.
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