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https://issues.apache.org/jira/browse/PHOENIX-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16554651#comment-16554651
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ASF GitHub Bot commented on PHOENIX-4799:
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Github user twdsilva commented on the issue:
https://github.com/apache/phoenix/pull/313
Thanks for the suggestion, I will update the patch to use SYSTEM.MUTEX
> Write cells using checkAndMutate to prevent conflicting changes
> ---------------------------------------------------------------
>
> Key: PHOENIX-4799
> URL: https://issues.apache.org/jira/browse/PHOENIX-4799
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Thomas D'Silva
> Assignee: Thomas D'Silva
> Priority: Major
>
> In order to prevent race conditions when multiple client try to mutate the
> same column before sending the request to mutate the column to the server do
> a checkAndMutate with the column name being added/dropped. Also:
> 1. When a view is created do a checkAndMutate with the columns in the view
> where clause.
> 2. When an index on a view is created do a checkAndMutate with the indexed
> columns.
>
> To prevent a race condition in the DROP TABLE CASCADE case, when a table is
> dropped do a checkAndMutate with the rowkey of the base table name. If a view
> is created it also does a checkAndMutate with the same rowkey.
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