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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3823) Force cache update on MetaDataEntityNotFoundException
Date Thu, 01 Jun 2017 16:04:04 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16033210#comment-16033210
] 

James Taylor commented on PHOENIX-3823:
---------------------------------------

Thanks for the updated patch, [~sukunaidu@gmail.com]. One very minor nit and then I think
we can commit this:
- Let's move this logic into the constructor of BaseColumnResolver and just store mutatingTableName
as the member variable instead of mutatingTable.
{code}
+                if(mutatingTable!=null && tableNode!=null ){
+                  String mutateSchemaName = mutatingTable.getSchemaName()==null?null:
+                                              mutatingTable.getSchemaName().getString();
+                  String mutateTableName = mutatingTable.getTableName().getString();
+                  TableName mutatingTableName = TableName.create(mutateSchemaName, mutateTableName);
+                  if(tableNode.getName().equals(mutatingTableName)){
+                    alwaysHitServer = true;
+                  }
+                }
{code}

I'll commit other patches on PHOENIX-3819 too - would you mind just confirming they all still
apply cleanly?

> Force cache update on MetaDataEntityNotFoundException 
> ------------------------------------------------------
>
>                 Key: PHOENIX-3823
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3823
>             Project: Phoenix
>          Issue Type: Sub-task
>    Affects Versions: 4.10.0
>            Reporter: James Taylor
>            Assignee: Maddineni Sukumar
>             Fix For: 4.11.0
>
>         Attachments: PHOENIX-3823.patch, PHOENIX-3823.v2.patch, PHOENIX-3823.v3.patch,
PHOENIX-3823.v4.patch, PHOENIX-3823.v5.patch, PHOENIX-3823.v6.patch, PHOENIX-3823.v7.patch
>
>
> 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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