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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13140) GlobalStorageStatistics should check null FileSystem scheme to avoid NPE
Date Mon, 16 May 2016 20:38:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15285252#comment-15285252

Colin Patrick McCabe commented on HADOOP-13140:

Thanks for looking at this.  I don't think it makes sense to use a null, empty string, or
otherwise invalid string to identify a statistics object.  It has no meaning to the user.
 I think if the user passes a URL with a null schema, we should call {{FileSystem#getDefaultUri}}
and use the default schema, similar to how {{FileSystem#get}} functions.

> 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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