[jira] [Commented] (HIVE-13345) LLAP: metadata cache takes too much space, esp. with bloom filters, due to Java/protobuf overhead

["Sergey Shelukhin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-13345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15209551#comment-15209551 ] 

Sergey Shelukhin commented on HIVE-13345:
-----------------------------------------

[~gopalv] [~prasanth_j] fyi

> LLAP: metadata cache takes too much space, esp. with bloom filters, due to Java/protobuf overhead
> -------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-13345
>                 URL: https://issues.apache.org/jira/browse/HIVE-13345
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>
> We cache java objects currently; these have high overhead, average stripe metadata takes 200-500Kb on real files, and with bloom filters blowing up more than x5 due to being stored as list of Long-s, up to 5Mb per stripe. That is undesirable.
> We should either create better objects for ORC (might be good in general) or store serialized metadata and deserialize when needed.



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