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Date: Tue, 2 May 2017 19:23:04 +0000 (UTC)
From: "Maddineni Sukumar (JIRA)" <jira@apache.org>
To: dev@phoenix.apache.org
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Subject: [jira] [Commented] (PHOENIX-3823) Force cache update on
 MetaDataEntityNotFoundException
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archived-at: Tue, 02 May 2017 19:23:07 -0000


    [ https://issues.apache.org/jira/browse/PHOENIX-3823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993556#comment-15993556 ] 

Maddineni Sukumar commented on PHOENIX-3823:
--------------------------------------------

Sure James, I cant expect more detailed info with steps, classes to use than this :) . Thanks for making my job smooth during my first patch to Phoenix. 
Will work on unit test today and patch today. 

> Force cache update on MetaDataEntityNotFoundException 
> ------------------------------------------------------
>
>                 Key: PHOENIX-3823
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3823
>             Project: Phoenix
>          Issue Type: Sub-task
>            Reporter: James Taylor
>            Assignee: Maddineni Sukumar
>
> When UPDATE_CACHE_FREQUENCY is used, clients will cache metadata for a period of time which may cause the schema being used to become stale. If another client adds a column or a new table or view, other clients won't see it. As a result, the client will get a MetaDataEntityNotFoundException. Instead of bubbling this up, we should retry after forcing a cache update on the tables involved in the query.
> The above works well for references to entities that don't yet exist. However, we cannot detect when some entities are referred to which no longer exists until the cache expires. An exception is if a physical table is dropped which would be detected immediately, however we would allow queries and updates to columns which have been dropped until the cache entry expires (which seems like a reasonable tradeoff IMHO. In addition, we won't start using indexes on tables until the cache expires.


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