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https://issues.apache.org/jira/browse/SPARK-9411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14645295#comment-14645295
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Apache Spark commented on SPARK-9411:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/7741
> Make page size configurable
> ---------------------------
>
> Key: SPARK-9411
> URL: https://issues.apache.org/jira/browse/SPARK-9411
> Project: Spark
> Issue Type: Improvement
> Reporter: Reynold Xin
> Assignee: Josh Rosen
> Priority: Critical
>
> We need to make page sizes configurable so we can reduce them in unit tests
> and increase them in real production workloads.
> The following hardcoded page sizes need to be updated:
> - Spark Core: UnsafeShuffleExternalSorter.PAGE_SIZE
> - Spark SQL: UnsafeExternalSorter.PAGE_SIZE
> - Unsafe: BytesToBytesMap.PAGE_SIZE_BYTES
> While updating the page sizes, we should also update certain size
> calculations which are based on the page size so that they do not assume that
> all pages are the same size. This isn't strictly necessary in this patch but
> should be done eventually as part of supporting overflow pages for large
> records.
> A number of unit tests also need to be updated to account for the new page
> sizes.
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