hadoop/hadoop-tools/hadoop-azure
Steve Loughran 42c71a5790
HADOOP-15691. Add PathCapabilities to FileSystem and FileContext.
Contributed by Steve Loughran.

This complements the StreamCapabilities Interface by allowing applications to probe for a specific path on a specific instance of a FileSystem client
to offer a specific capability.

This is intended to allow applications to determine

* Whether a method is implemented before calling it and dealing with UnsupportedOperationException.
* Whether a specific feature is believed to be available in the remote store.

As well as a common set of capabilities defined in CommonPathCapabilities,
file systems are free to add their own capabilities, prefixed with
 fs. + schema + .

The plan is to identify and document more capabilities -and for file systems which add new features, for a declaration of the availability of the feature to always be available.

Note

* The remote store is not expected to be checked for the feature;
  It is more a check of client API and the client's configuration/knowledge
  of the state of the remote system.
* Permissions are not checked.
2020-08-19 17:15:06 +01:00
..
dev-support HADOOP-15547/ WASB: improve listStatus performance. 2018-07-19 12:31:19 -07:00
src HADOOP-15691. Add PathCapabilities to FileSystem and FileContext. 2020-08-19 17:15:06 +01:00
.gitignore HADOOP-10728. Metrics system for Windows Azure Storage Filesystem. Contributed by Dexter Bradshaw, Mostafa Elhemali, Xi Fang, Johannes Klein, David Lao, Mike Liddell, Chuan Liu, Lengning Liu, Ivan Mitic, Michael Rys, Alexander Stojanovic, Brian Swan, and Min Wei. 2014-06-24 20:52:44 +00:00
pom.xml HADOOP-16612. Track Azure Blob File System client-perceived latency 2019-12-08 21:31:51 -08:00