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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-16520) Cache hive metadata in metastore
Date Fri, 28 Apr 2017 17:59:04 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated HIVE-16520:
------------------------------
    Attachment:     (was: HIVE-16520-1.patch)

> 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
>         Attachments: 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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