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https://issues.apache.org/jira/browse/PHOENIX-4694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16444883#comment-16444883
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James Taylor commented on PHOENIX-4694:
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The lock on the parent during creation of a view is need to prevent a race
condition between creating a view and adding/dropping a column from a base
table. This will no longer be required after PHOENIX-3534. For now, we can
reduce contention by not locking the parent during drop as that's not required.
> Prevent locking of parent table when dropping view to reduce contention
> -----------------------------------------------------------------------
>
> Key: PHOENIX-4694
> URL: https://issues.apache.org/jira/browse/PHOENIX-4694
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Priority: Major
> Fix For: 4.14.0, 5.0.0
>
>
> When there are many views with the same parent table, there's a lot of
> contention when adding new views and dropping existing views. The lock is
> only necessary when creating/dropping indexes, so should be removed in the
> case of views.
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