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https://issues.apache.org/jira/browse/ORC-2131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dzcxzl resolved ORC-2131.
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Fix Version/s: 3.0.0
2.3.1
Resolution: Fixed
Issue resolved by pull request 2580
[https://github.com/apache/orc/pull/2580]
> Set default of orc.stripe.size.check.ratio and orc.dictionary.max.size.bytes
> to 0
> ----------------------------------------------------------------------------------
>
> Key: ORC-2131
> URL: https://issues.apache.org/jira/browse/ORC-2131
> Project: ORC
> Issue Type: Improvement
> Reporter: yongqian
> Assignee: yongqian
> Priority: Major
> Fix For: 3.0.0, 2.3.1
>
>
> Background
> After enabling the optimizations related to {{orc.stripe.size.check.ratio}}
> and {{{}orc.dictionary.max.size.bytes{}}}, we observed that ORC files written
> with the current defaults are about 10%–20% larger than before. For example,
> datasets that were previously ~1.0–1.1 TB grow to ~1.2 TB with the current
> defaults, causing noticeable storage and I/O cost increase.
> Current defaults
> * {{{}orc.dictionary.max.size.bytes{}}}: 16MB (16 * 1024 * 1024) — turns off
> dictionary encoding when dictionary size exceeds this limit.
> * {{{}orc.stripe.size.check.ratio{}}}: 2.0 — flushes a stripe when tree
> writer size exceeds (ratio × orc.stripe.size).
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