[
https://issues.apache.org/jira/browse/HADOOP-12810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15433306#comment-15433306
]
Chris Trezzo commented on HADOOP-12810:
---------------------------------------
Adding 2.6.5 to the target versions with the intention of backporting this to
branch-2.6. We would also backport the associated MAPREDUCE-6637 for the test
fix. Please let me know if you think otherwise. Thanks!
> FileSystem#listLocatedStatus causes unnecessary RPC calls
> ---------------------------------------------------------
>
> Key: HADOOP-12810
> URL: https://issues.apache.org/jira/browse/HADOOP-12810
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs, fs/s3
> Affects Versions: 2.7.2
> Reporter: Ryan Blue
> Assignee: Ryan Blue
> Fix For: 2.7.3
>
> Attachments: HADOOP-12810.1.patch
>
>
> {{FileSystem#listLocatedStatus}} lists the files in a directory and then
> calls {{getFileBlockLocations(stat.getPath(), ...)}} for each instead of
> {{getFileBlockLocations(stat, ...)}}. That function with the path arg just
> calls {{getFileStatus}} to get another file status from the path and calls
> the file status version, so this ends up calling {{getFileStatus}}
> unnecessarily.
> This is particularly bad for S3, where {{getFileStatus}} is expensive.
> Avoiding the extra call improved input split calculation time for a data set
> in S3 by ~20x: from 10 minutes to 25 seconds.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
