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https://issues.apache.org/jira/browse/HIVE-16520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16018721#comment-16018721
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Lefty Leverenz commented on HIVE-16520:
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Doc note: This adds two configuration parameters
(*hive.metastore.cached.rawstore.impl* and
*hive.metastore.cached.rawstore.cache.update.frequency*) to HiveConf.java, so
they need to be documented for release 3.0.0.
The wiki's description of *hive.metastore.cached.rawstore.impl* should include
the release note.
* [Configuration Properties -- MetaStore |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-MetaStore]
Added a TODOC3.0 label.
> Cache hive metadata in metastore
> --------------------------------
>
> Key: HIVE-16520
> URL: https://issues.apache.org/jira/browse/HIVE-16520
> Project: Hive
> Issue Type: New Feature
> Components: Metastore
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Labels: TODOC3.0
> Fix For: 3.0.0
>
> Attachments: HIVE-16520-1.patch, HIVE-16520.2.patch,
> HIVE-16520.3.patch, HIVE-16520.4.patch, HIVE-16520-proto-2.patch,
> HIVE-16520-proto.patch
>
>
> During Hive 2 benchmark, we find Hive metastore operation take a lot of time
> and thus slow down Hive compilation. In some extreme case, it takes much
> longer than the actual query run time. Especially, we find the latency of
> cloud db is very high and 90% of total query runtime is waiting for metastore
> SQL database operations. Based on this observation, the metastore operation
> performance will be greatly enhanced if we have a memory structure which
> cache the database query result.
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