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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (NUTCH-2281) Support non-default FileSystem
Date Thu, 06 Apr 2017 10:01:41 GMT


ASF GitHub Bot commented on NUTCH-2281:

sebastian-nagel closed pull request #119: NUTCH-2281 Support non-default FileSystem
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> Support non-default FileSystem
> ------------------------------
>                 Key: NUTCH-2281
>                 URL:
>             Project: Nutch
>          Issue Type: Improvement
>    Affects Versions: 1.12
>            Reporter: Sebastian Nagel
>             Fix For: 1.14
> If a path (input or output) does not belong to the configured default FileSystem various
Nutch tools may raise an exception like
> {noformat}
>   Exception in ... java.lang.IllegalArgumentException: Wrong FS: s3a://..., expected:
> {noformat}
> This is fixed by getting a reference to the FileSystem from the Path object
> {noformat}
>   FileSystem fs = path.getFileSystem(getConf());
> {noformat}
> instead of
> {noformat}
>   FileSystem fs = FileSystem.get(getConf());
> {noformat}
> A given path (e.g., {{s3a://...}}) may not belong to the default file system ({{hdfs://}}
or {{file://}} in local mode) and simple checks such as {{fs.exists(path)}} then will fail.
Cf. [FileSystem.checkPath(path)|],
and [FileSystem.get(conf)|]
vs. [FileSystem.get(URI,conf)|,%20org.apache.hadoop.conf.Configuration)]
which is called by [Path.getFileSystem(conf)|].
> Note that the FileSystem for input and output may be different, e.g., read from HDFS
and write to S3.

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