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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2017/09/01 14:06:00 UTC
[jira] [Updated] (HADOOP-14757) S3AFileSystem.innerRename() to size
metadatastore lists better
[ https://issues.apache.org/jira/browse/HADOOP-14757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Loughran updated HADOOP-14757:
------------------------------------
Fix Version/s: (was: HADOOP-13345)
3.1.0
> 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: HADOOP-13345
> Reporter: Steve Loughran
> Priority: Minor
> Fix For: 3.1.0
>
>
> 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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