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https://issues.apache.org/jira/browse/PHOENIX-3823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Taylor updated PHOENIX-3823:
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Description:
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.
was: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.
> 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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