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Posted to dev@metamodel.apache.org by "Kasper Sørensen (JIRA)" <ji...@apache.org> on 2015/08/25 09:01:46 UTC

[jira] [Resolved] (METAMODEL-179) FileSystem instance in HdfsResource should not be closed

     [ https://issues.apache.org/jira/browse/METAMODEL-179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kasper Sørensen resolved METAMODEL-179.
---------------------------------------
       Resolution: Fixed
    Fix Version/s: 4.4.0

> FileSystem instance in HdfsResource should not be closed
> --------------------------------------------------------
>
>                 Key: METAMODEL-179
>                 URL: https://issues.apache.org/jira/browse/METAMODEL-179
>             Project: Apache MetaModel
>          Issue Type: Bug
>            Reporter: Tomasz Guzialek
>            Assignee: Tomasz Guzialek
>            Priority: Critical
>             Fix For: 4.4.0
>
>
> In HdfsResource, a FileSystem instance is obtained via get() method. According to [1] this method does not return a new instance every time, but caches it for the same configuration. Closing such instance may result in IOException: Filesystem closed in other, possibly unrelated, places in the code also using this FileSystem instance.
> Possible solutions: 
> 1) Despite a Java convention to always close Closable objects after use, we should leave without closing. Apparently, Hive does it this way (see [1])
> 2) Create instances of FileSystem with newInstance() method, but this is an expensive operation.
> [1] http://stackoverflow.com/questions/20057881/hadoop-filesystem-closed-exception-when-doing-bufferedreader-close/20061797#20061797



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