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From "Sergey Kalashnikov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-7359) SQL: DDL synchronization with query and cache API operations
Date Tue, 09 Jan 2018 11:22:00 GMT
Sergey Kalashnikov created IGNITE-7359:

             Summary: 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
             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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