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From "Mithun Radhakrishnan (JIRA)" <>
Subject [jira] [Updated] (HIVE-17669) Cache to optimize SearchArgument deserialization
Date Tue, 03 Oct 2017 20:59:00 GMT


Mithun Radhakrishnan updated HIVE-17669:
    Attachment: HIVE-17699.2.patch

Is this more palatable? I've switched over to using a configurably bounded Guava {{Cache}}.
I'm not sure what the default max-size should be. I've left it at 100. Is that acceptable?

[~prasanth_j], do you suppose we should leave out doing the MD5/SHA-1 hashing? Would that
be overkill, given the small cache-size?

I'm working on a {{branch-2}} port. (I'll have to rewrite the lambda bits.)

> Cache to optimize SearchArgument deserialization
> ------------------------------------------------
>                 Key: HIVE-17669
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: ORC, Query Processor
>    Affects Versions: 2.2.0, 3.0.0
>            Reporter: Mithun Radhakrishnan
>            Assignee: Chris Drome
>         Attachments: HIVE-17699.1.patch, HIVE-17699.2.patch
> And another, from [~selinazh] and [~cdrome]. (YHIVE-927)
> When a mapper needs to process multiple ORC files, it might land up having use essentially
the same {{SearchArgument}} over several files. It would be good not to have to deserialize
from string, over and over again. Caching the object against the string-form should speed
things up.

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