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Posted to issues@drill.apache.org by "Rahul Challapalli (JIRA)" <ji...@apache.org> on 2016/05/12 19:35:12 UTC
[jira] [Updated] (DRILL-4126) Adding HiveMetaStore caching when
impersonation is enabled.
[ https://issues.apache.org/jira/browse/DRILL-4126?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Rahul Challapalli updated DRILL-4126:
-------------------------------------
Reviewer: Dechang Gu (was: Rahul Challapalli)
> Adding HiveMetaStore caching when impersonation is enabled.
> ------------------------------------------------------------
>
> Key: DRILL-4126
> URL: https://issues.apache.org/jira/browse/DRILL-4126
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Jinfeng Ni
> Assignee: Jinfeng Ni
> Fix For: 1.5.0
>
>
> Currently, HiveMetastore caching is used only when impersonation is disabled, such that all the hivemetastore call goes through NonCloseableHiveClientWithCaching [1]. However, if impersonation is enabled, caching is not used for HiveMetastore access.
> This could significantly increase the planning time when hive storage plugin is enabled, or when running a query against INFORMATION_SCHEMA. Depending on the # of databases/tables in Hive storage plugin, the planning time or INFORMATION_SCHEMA query could become unacceptable. This becomes even worse if the hive metastore is running on a different node from drillbit, making the access of hivemetastore even slower.
> We are seeing that it could takes 30~60 seconds for planning time, or execution time for INFORMATION_SCHEMA query. The long planning or execution time for INFORMATION_SCHEMA query prevents Drill from acting "interactively" for such queries.
> We should enable caching when impersonation is used. As long as the authorizer verifies the user has the access to databases/tables, we should get the data from caching. By doing that, we should see reduced number of api call to HiveMetaStore.
> [1] https://github.com/apache/drill/blob/master/contrib/storage-hive/core/src/main/java/org/apache/drill/exec/store/hive/DrillHiveMetaStoreClient.java#L299
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