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https://issues.apache.org/jira/browse/HADOOP-13140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15283289#comment-15283289
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Mingliang Liu commented on HADOOP-13140:
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Thanks [~ste...@apache.org] and [~arpitagarwal] for your insightful comments.
The new design uses a TreeMap in GlobalStorageStatistics for "natural ordering
iterator" which does not accept a null key. This is the root cause of this
problem. Actually I think it's fine to disallow null scheme in the newly added
GlobalStorageStatistics. To me, a null file system scheme is always a magic,
though I'm happy with a schemeless URI.
For backward compatibility, schemaless statistics seems a good idea to me. Ping
[~cmccabe].
> 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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