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https://issues.apache.org/jira/browse/HIVE-11500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662715#comment-14662715
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Sergey Shelukhin commented on HIVE-11500:
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I will attach a short design doc early next week.
> implement file footer / splits cache in HBase metastore
> -------------------------------------------------------
>
> Key: HIVE-11500
> URL: https://issues.apache.org/jira/browse/HIVE-11500
> Project: Hive
> Issue Type: Sub-task
> Components: Metastore
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
>
> We need to cache file metadata (e.g. ORC file footers) for split generation
> (which, on FSes that support fileId, will be valid permanently and only needs
> to be removed lazily when ORC file is erased or compacted), and potentially
> even some information about splits (e.g. grouping based on location that
> would be good for some short time), in HBase metastore.
> It should be queryable by table. Partition predicate pushdown should be
> supported. If bucket pruning is added, that too.
> In later phases, it would be nice to save the (first category above) results
> of expensive work done by jobs, e.g. data size after decompression/decoding
> per column, etc. to avoid surprises when ORC encoding is very good, or very
> bad. Perhaps it can even be lazily generated. Here's a pony: 🐴
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