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