Add a method to get file length for Seekable, FSDataInputStream and libhdfs
---------------------------------------------------------------------------
Key: HADOOP-5143
URL: https://issues.apache.org/jira/browse/HADOOP-5143
Project: Hadoop Core
Issue Type: New Feature
Components: dfs, fs, libhdfs
Affects Versions: 0.18.2
Reporter: Qi Liu
When open any seekable file, it should be able to get the length of the file
via Seekable interface, since the seek method should be able to detect seeking
beyond the end of file. Such interface can benefit distributed file systems by
saving a network round-trip of FileSystem.getFileStatus(Path).getLen() for any
open file.
In libhdfs, such interface should also be exposed to make native program taking
advantage of this change.
I have the changes locally for all FSInputStream concrete classes. The change
can be considered trivial, since some of the FSInputStream classes already have
a method named getFileLength(), or a member field named size/length/end.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
