[jira] Updated: (HADOOP-5861) s3n files are not getting split by default

["Tom White (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-5861?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tom White updated HADOOP-5861:
------------------------------

    Attachment: hadoop-5861.patch

Here's a patch which makes the default block size 64MB (configured using fs.s3n.block.size). It also fixes HADOOP-5804, which is related.

> s3n files are not getting split by default 
> -------------------------------------------
>
>                 Key: HADOOP-5861
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5861
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: fs/s3
>    Affects Versions: 0.19.1
>         Environment: ec2
>            Reporter: Joydeep Sen Sarma
>         Attachments: hadoop-5861.patch
>
>
> running with stock ec2 scripts against hadoop-19 - i tried to run a job against a directory with 4 text files - each about 2G in size. These were not split (only 4 mappers were run).
> The reason seems to have two parts - primarily that S3N files report a block size of 5G. This causes FileInputFormat.getSplits to fall back on goal size (which is totalsize/conf.get("mapred.map.tasks")).Goal Size in this case was 4G - hence the files were not split. This is not an issue with other file systems since the block size reported is much smaller and the splits get based on block size (not goal size).
> can we make the S3N files report a more reasonable block size?

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