[jira] [Created] (PHOENIX-6190) Race condition in view creation may allow conflicting changes for pre-4.15 clients and for scenarios with phoenix.allow.system.catalog.rollback=true

["Chinmay Kulkarni (Jira)" <ji...@apache.org>]

Chinmay Kulkarni created PHOENIX-6190:
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             Summary: Race condition in view creation may allow conflicting changes for pre-4.15 clients and for scenarios with phoenix.allow.system.catalog.rollback=true
                 Key: PHOENIX-6190
                 URL: https://issues.apache.org/jira/browse/PHOENIX-6190
             Project: Phoenix
          Issue Type: Bug
    Affects Versions: 4.15.0, 5.0.0
            Reporter: Chinmay Kulkarni
             Fix For: 5.1.0, 4.16.0


For pre-4.15 clients and in scenarios where phoenix.allow.system.catalog.rollback=true, we have to block adding/dropping a column to/from a parent table/view as we no longer lock the parent on the server side while creating a child view to prevent conflicting changes. This is handled on the client side from 4.15 onwards.

However, there is a slight race condition here where a view may be created between the time we find all children of the parent and the time we do this check (see [this|https://github.com/apache/phoenix/blob/264310bd1e6c14996c3cfb11557fc66a012cb01b/phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java#L2592]).



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