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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13140) GlobalStorageStatistics should check null FileSystem scheme to avoid NPE
Date Fri, 13 May 2016 23:12:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15283289#comment-15283289

Mingliang Liu commented on HADOOP-13140:

Thanks [~stevel@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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