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https://issues.apache.org/jira/browse/HADOOP-14757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-14757.
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Resolution: Won't Fix
need to get rid of the lists entirely as it doesn't scale up enough
> S3AFileSystem.innerRename() to size metadatastore lists better
> --------------------------------------------------------------
>
> Key: HADOOP-14757
> URL: https://issues.apache.org/jira/browse/HADOOP-14757
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.0.0-beta1
> Reporter: Steve Loughran
> Priority: Minor
>
> In {{S3AFileSystem.innerRename()}}, various ArrayLists are created to track
> paths to update; these are created with the default size. It could/should be
> possible to allocate better, so avoid expensive array growth & copy
> operations while iterating through the list of entries.
> # for a single file copy, sizes == 1
> # for a recursive copy, the outcome of the first real LIST will either
> provide the actual size, or, if the list == the max response, a very large
> minimum size.
> For #2, we'd need to get the hint of iterable length rather than just iterate
> through...some interface {{{IterableLength.expectedMinimumSize()}} could do
> that.
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