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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13427) Eliminate needless uses of FileSystem#{exists(), isFile(), isDirectory()}
Date Wed, 02 Nov 2016 23:19:58 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Mingliang Liu updated HADOOP-13427:
    Attachment: HADOOP-13427.004.patch

So we'll see less test failures with v4 patch? {{org.apache.hadoop.fs.azure.TestNativeAzureFileSystemOperationsMocked}}
is failing without this patch. I posted comment in [HADOOP-7352].

Findbugs warnings are interesting. Seems existing behavior; will confirm this.

> 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: Steve Loughran
>         Attachments: HADOOP-13427-001.patch, HADOOP-13427-002.patch, HADOOP-13427.003.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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