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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13427) Eliminate needless uses of FileSystem#{exists(), isFile(), isDirectory()}
Date Tue, 15 Nov 2016 18:51:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15667933#comment-15667933

Steve Loughran commented on HADOOP-13427:


> Eliminate needless uses of FileSystem#{exists(), isFile(), isDirectory()}
> -------------------------------------------------------------------------
>                 Key: HADOOP-13427
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13427
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Assignee: Mingliang Liu
>         Attachments: HADOOP-13427-001.patch, HADOOP-13427-002.patch, HADOOP-13427.003.patch,
HADOOP-13427.004.patch, HADOOP-13427.005.patch, HADOOP-13427.006.patch, HADOOP-13427.007.patch,
HADOOP-13427.008.patch, HADOOP-13427.008.patch, HADOOP-13427.009.patch, HADOOP-13427.009.patch
> We're cleaning up Hive and Spark's use of FileSystem.exists, because it is often the
case we see code of exists+open, exists+delete, when the exists probe is needless. Against
object stores, expensive needless.
> Hadoop can set an example here by stripping them out. It will also show where there are
opportunities to optimise things better and/or improve reporting.

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