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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14943) S3A to implement getFileBlockLocations() for mapred partitioning
Date Thu, 16 Nov 2017 14:01:01 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-14943:
------------------------------------
    Status: Open  (was: Patch Available)

> S3A to implement getFileBlockLocations() for mapred partitioning
> ----------------------------------------------------------------
>
>                 Key: HADOOP-14943
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14943
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.8.1
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Critical
>         Attachments: HADOOP-14943-001.patch
>
>
> It looks suspiciously like S3A isn't providing the partitioning data needed in {{listLocatedStatus}}
and {{getFileBlockLocations()}} needed to break up a file by the blocksize. This will stop
tools using the MRv1 APIS doing the partitioning properly if the input format isn't doing
it own split logic.
> FileInputFormat in MRv2 is a bit more configurable about input split calculation &
will split up large files. but otherwise, the partitioning is being done more by the default
values of the executing engine, rather than any config data from the filesystem about what
its "block size" is,
> NativeAzureFS does a better job; maybe that could be factored out to hadoop-common and
reused?



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