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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4799) Write cells using checkAndMutate to prevent conflicting changes
Date Tue, 24 Jul 2018 18:36:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16554651#comment-16554651
] 

ASF GitHub Bot commented on PHOENIX-4799:
-----------------------------------------

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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