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Posted to dev@hive.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2016/03/24 02:28:25 UTC
[jira] [Created] (HIVE-13345) LLAP: metadata cache takes too much
space, esp. with bloom filters, due to Java/protobuf overhead
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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