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From Suresh Srinivas <sur...@hortonworks.com>
Subject Re: What is the difference between Hdfs and DistributedFileSystem?
Date Mon, 13 Jan 2014 19:22:04 GMT
Hadoop has two sets of APIs:
- FileSystem.java - this is the older API and more widely used. This
defines both the application API and the API that the concrete file systems
must implement (such as DistributedFileSystem, LocalFileSystem,
ChecksumFileSystem etc.)
- FileContext.java and AbstractFileSystem.java - these are new APIs. The
goal was to divide the Hadoop API into two - application API in
FileContext.java and file system implementation interface
AbstractFileSystem.java. More details -
https://issues.apache.org/jira/browse/HADOOP-4952.

Hdfs.java is the newer implementation of AbstractFileSystem.java.
DistributedFileSystem.java implements the older API FileSystem.java.




On Mon, Jan 13, 2014 at 3:31 AM, 梁李印 <liyin.liangly@aliyun-inc.com> wrote:

> What is the difference between Hdfs.java and DistributedFileSystem.java in
> Hadoop2?
>
>
>
> Best Regards,
>
> Liyin Liang
>
>
>
> Tel: 78233
>
> Email: liyin.liangly@alibaba-inc.com
>
>
>



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