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https://issues.apache.org/jira/browse/NUTCH-2281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebastian Nagel reassigned NUTCH-2281:
--------------------------------------
Assignee: Sebastian Nagel
> Support non-default FileSystem
> ------------------------------
>
> Key: NUTCH-2281
> URL: https://issues.apache.org/jira/browse/NUTCH-2281
> Project: Nutch
> Issue Type: Improvement
> Affects Versions: 1.12
> Reporter: Sebastian Nagel
> Assignee: 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: hdfs://...
> {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)|https://hadoop.apache.org/docs/r2.7.2/api/org/apache/hadoop/fs/FileSystem.html#checkPath(org.apache.hadoop.fs.Path)],
> and
> [FileSystem.get(conf)|https://hadoop.apache.org/docs/r2.7.2/api/org/apache/hadoop/fs/FileSystem.html#get(org.apache.hadoop.conf.Configuration)]
> vs.
> [FileSystem.get(URI,conf)|https://hadoop.apache.org/docs/r2.7.2/api/org/apache/hadoop/fs/FileSystem.html#get(java.net.URI,%20org.apache.hadoop.conf.Configuration)]
> which is called by
> [Path.getFileSystem(conf)|https://hadoop.apache.org/docs/r2.7.2/api/org/apache/hadoop/fs/Path.html#getFileSystem%28org.apache.hadoop.conf.Configuration%29].
>
> Note that the FileSystem for input and output may be different, e.g., read
> from HDFS and write to S3.
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