You are viewing a plain text version of this content. The canonical link for it is here.
Posted to common-dev@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2019/04/26 18:54:00 UTC
[jira] [Resolved] (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 resolved HADOOP-14757.
-------------------------------------
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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: common-dev-unsubscribe@hadoop.apache.org
For additional commands, e-mail: common-dev-help@hadoop.apache.org