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From "Suraj Nayak (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5907) Improve getSplits() performance for fs implementations that can utilize performance gains from recursive listing
Date Tue, 11 Apr 2017 22:42:41 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15965069#comment-15965069
] 

Suraj Nayak commented on MAPREDUCE-5907:
----------------------------------------

Yeah, Thanks [~ksumit] for the quick reply. I would wait on some committer to give some suggestion
as of today so I or you can resume work if the issue is till open. There has been a lot of
changes since the earlier suggestion was made :)


> Improve getSplits() performance for fs implementations that can utilize performance gains
from recursive listing
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5907
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5907
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 2.4.0
>            Reporter: Sumit Kumar
>            Assignee: Sumit Kumar
>              Labels: BB2015-05-TBR
>         Attachments: MAPREDUCE-5907-2.patch, MAPREDUCE-5907-3.patch, MAPREDUCE-5907.patch
>
>
> FileInputFormat (both mapreduce and mapred implementations) use recursive listing while
calculating splits. They however do this by doing listing level by level. That means to discover
files in /foo/bar means they do listing at /foo/bar first to get the immediate children, then
make the same call on all immediate children for /foo/bar to discover their immediate children
and so on. This doesn't scale well for object store based fs implementations like s3 and swift
because every listStatus call ends up being a webservice call to backend. In cases where large
number of files are considered for input, this makes getSplits() call slow. 
> This patch adds a new set of recursive list apis that gives opportunity to the fs implementations
to optimize. The behavior remains the same for other implementations (that is a default implementation
is provided for other fs so they don't have to implement anything new). However for objectstore
based fs implementations it provides a simple change to include recursive flag as true (as
shown in the patch) to improve listing performance.



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