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https://issues.apache.org/jira/browse/HIVE-7195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brock Noland updated HIVE-7195:
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Description:
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.
was:
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 at 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.
> Improve Metastore performance
> -----------------------------
>
> Key: HIVE-7195
> URL: https://issues.apache.org/jira/browse/HIVE-7195
> Project: Hive
> Issue Type: Bug
> Reporter: Brock Noland
>
> 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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