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https://issues.apache.org/jira/browse/HIVE-13345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15214825#comment-15214825
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Sergey Shelukhin commented on HIVE-13345:
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I think the problem is/was that ORC readers were created with proto objects.
Anyway, I'll take a look at how complex both approaches are at some point (this
week?)
> 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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