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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7195) Improve Metastore performance
Date Thu, 12 Jun 2014 01:54:02 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028725#comment-14028725
] 

Brock Noland commented on HIVE-7195:
------------------------------------

bq. API will need to be augmented to explicitly say what is needed/not needed.

Any changes to the HMS API should use the single request/response object model as opposed
to the current method of multiple arguments to a method. This will allow us to easily iterate
on these API's without breaking compatibility.

> Improve Metastore performance
> -----------------------------
>
>                 Key: HIVE-7195
>                 URL: https://issues.apache.org/jira/browse/HIVE-7195
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Brock Noland
>            Priority: Critical
>
> Even with direct SQL, which significantly improves MS performance, some operations take
a considerable amount of time, when there are many partitions on table. Specifically I believe
the issue:
> * When a client gets all partitions we do not send them an iterator, we create a collection
of all data and then pass the object over the network in total
> * Operations which require looking up data on the NN can still be slow since there is
no cache of information and it's done in a serial fashion
> * Perhaps a tangent, but our client timeout is quite dumb. The client will timeout and
the server has no idea the client is gone. We should use deadlines, i.e. pass the timeout
to the server so it can calculate that the client has expired.



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