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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 Tue, 17 May 2016 19:02:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15287297#comment-15287297

Colin Patrick McCabe commented on HADOOP-13140:

  /** Called after a new FileSystem instance is constructed.
   * @param name a uri whose authority section names the host, port, etc.
   *   for this FileSystem
   * @param conf the configuration
  public void initialize(URI name, Configuration conf) throws IOException {
    statistics = getStatistics(name.getScheme(), getClass());    
    resolveSymlinks = conf.getBoolean(

If {{name#getScheme()}} is empty or null here, we can use {{FileSystem#getDefaultUri#getScheme}}
to pass a non-null scheme.  That should cover almost all the cases where a null scheme would
be passed.

If the user intentionally passes a null or empty scheme directly to {{FileSystem#getStatistics}},
we should throw an exception.

> 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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