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Posted to issues@spark.apache.org by "Andrew Ash (JIRA)" <ji...@apache.org> on 2014/11/14 12:22:33 UTC

[jira] [Commented] (SPARK-1568) Spark 0.9.0 hangs reading s3

    [ https://issues.apache.org/jira/browse/SPARK-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14212145#comment-14212145 ] 

Andrew Ash commented on SPARK-1568:
-----------------------------------

[~sams] did you see an improvement when you upgraded to 1.0.0?

I've noticed myself that reading from s3 can be slow, particularly in the scenario where there are many small files.  I think the hadoop S3 adapter makes many more API calls than is necessary, and that scales on the number of files you have.

> Spark 0.9.0 hangs reading s3
> ----------------------------
>
>                 Key: SPARK-1568
>                 URL: https://issues.apache.org/jira/browse/SPARK-1568
>             Project: Spark
>          Issue Type: Bug
>            Reporter: sam
>
> I've tried several jobs now and many of the tasks complete, then it get stuck and just hangs.  The exact same jobs function perfectly fine if I distcp to hdfs first and read from hdfs.
> Many thanks



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