[
https://issues.apache.org/jira/browse/IMPALA-6843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Tim Armstrong updated IMPALA-6843:
----------------------------------
Target Version: Product Backlog (was: Impala 3.1.0)
> Responses to prioritizedLoad() requests should be returned directly and not
> via the statestore
> ----------------------------------------------------------------------------------------------
>
> Key: IMPALA-6843
> URL: https://issues.apache.org/jira/browse/IMPALA-6843
> Project: IMPALA
> Issue Type: Improvement
> Components: Catalog
> Affects Versions: Impala 2.11.0
> Reporter: Dimitris Tsirogiannis
> Priority: Major
> Labels: catalog, frontend, latency, perfomance
>
> Currently, when a statement (e.g. SELECT) needs to access some unloaded
> tables, it issues a prioritizedLoad() request to the catalog. The catalog
> loads the table metadata but does not respond directly to the coordinator
> that issued the request. Instead, the metadata for the newly loaded tables
> are broadcast via the statestore. The problem with this approach is that the
> latency of the response may vary significantly and may depend on the
> latencies of other unrelated metadata operations (e.g. REFRESH) that happen
> to be in the same topic update.
> The response to a prioritizedLoad() request should come directly to the
> issuing coordinator. Other coordinators will receive the metadata of the
> newly loaded table via the statestore.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
