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https://issues.apache.org/jira/browse/HIVE-17669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16190551#comment-16190551
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Prasanth Jayachandran commented on HIVE-17669:
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I think replacing cache expiration with weight based eviction could be a better
approach (weight can be length of string). Also cutting down on the configs,
would be better to disable the cache for any values <= 0.
With weight based eviction, you can drop MD5 as long strings will get evicted
eventually.
> Cache to optimize SearchArgument deserialization
> ------------------------------------------------
>
> Key: HIVE-17669
> URL: https://issues.apache.org/jira/browse/HIVE-17669
> Project: Hive
> Issue Type: Improvement
> Components: ORC, Query Processor
> Affects Versions: 2.2.0, 3.0.0
> Reporter: Mithun Radhakrishnan
> Assignee: Mithun Radhakrishnan
> 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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