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

Wed, 23 Mar 2016 18:29:20 -0700 

Sergey Shelukhin created HIVE-13345:
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             Summary: 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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