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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13140) GlobalStorageStatistics should check null FileSystem scheme to avoid NPE
Date Fri, 13 May 2016 19:46:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15283061#comment-15283061

Arpit Agarwal commented on HADOOP-13140:

Yes I think it's better to have a special statistics object for the "null" scheme instead
of assuming that null means "file" as Steve suggests.

Java maps support a null key so that part will work fine but it may require non-trivial changes
in FileSystemStorageStatistics/GlobalStatistics if it is assumed the scheme is non-null everywhere.

> GlobalStorageStatistics should check null FileSystem scheme to avoid NPE
> ------------------------------------------------------------------------
>                 Key: HADOOP-13140
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13140
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 2.8.0
>            Reporter: Brahma Reddy Battula
>            Assignee: Mingliang Liu
>         Attachments: HADOOP-13140.000.patch
> {{org.apache.hadoop.fs.GlobalStorageStatistics#put}} is not checking the null scheme,
and the internal map will complain NPE. This was reported by a flaky test {{TestFileSystemApplicationHistoryStore}}.
Thanks [~brahmareddy] for reporting.
> To address this,
> # Fix the test by providing a valid URI, e.g. {{file:///}}
> # Guard the null scheme in {{GlobalStorageStatistics#put}}

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