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https://issues.apache.org/jira/browse/IGNITE-7359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16327052#comment-16327052
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ASF GitHub Bot commented on IGNITE-7359:
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GitHub user skalashnikov opened a pull request:
https://github.com/apache/ignite/pull/3386
IGNITE-7359: prototype for ddl vs cache ops synchronization
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gridgain/apache-ignite ignite-7359
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/ignite/pull/3386.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3386
----
commit cdfa8803298fd7dd957cfcb176f6207356783395
Author: skalashnikov <skalashnikov@...>
Date: 2018-01-15T09:58:59Z
IGNITE-7359: prototype for ddl vs cache ops synchronization
----
> SQL: DDL synchronization with query and cache API operations
> ------------------------------------------------------------
>
> Key: IGNITE-7359
> URL: https://issues.apache.org/jira/browse/IGNITE-7359
> Project: Ignite
> Issue Type: Bug
> Components: sql
> Affects Versions: 2.4
> Reporter: Sergey Kalashnikov
> Assignee: Sergey Kalashnikov
> Priority: Major
> Fix For: 2.5
>
>
> We need to add a means to synchronize DDL operations with queries and cache
> operations. This is required to facilitate future DDL improvements that would
> require to modify user data and/or some cache metadata atomically. Basically
> it is a sort of a global table lock.
> One way to achieve this is to re-use a mechanism used by the exchange
> procedure.
> An exchange is waiting for all already started cache operations to end before
> proceeding itself.
> Likewise, the new cache operations won't start until exchange procedure has
> completed.
> However, for DDL we only need to selectively defer operations that are made
> on the same cache as DDL operation.
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