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https://issues.apache.org/jira/browse/DRILL-5025?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Rogers resolved DRILL-5025.
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Resolution: Fixed
> ExternalSortBatch provides weak control over spill file size
> ------------------------------------------------------------
>
> Key: DRILL-5025
> URL: https://issues.apache.org/jira/browse/DRILL-5025
> Project: Apache Drill
> Issue Type: Sub-task
> Affects Versions: 1.8.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Priority: Minor
>
> The ExternalSortBatch (ESB) operator sorts records while spilling to disk to
> control memory use. The size of the spill file is not easy to control. It is
> a function of the accumulated batches size (half of the accumulated total),
> which is determined by either the memory budget or the
> {{drill.exec.sort.external.group.size}} parameter. (But, even with the
> parameter, the actual file size is still half the accumulated batches.)
> The proposed solution is to provide an explicit parameter that sets the
> maximum spill file size: {{drill.exec.sort.external.spill.size}}. If the ESB
> needs to spill more than this amount of data, ESB should split the spill into
> multiple files.
> The spill.size should be in bytes (or MB). (A size in records makes the file
> size data-dependent, which would not be helpful.)
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