Package org.apache.hadoop.fs.s3

A distributed, block-based implementation of FileSystem that uses Amazon S3 as a backing store.

See: Description

Class Summary

Class	Description
MigrationTool	Deprecated
S3FileSystem	Deprecated Use NativeS3FileSystem and S3AFileSystem instead.

Exception Summary

Exception	Description
S3Exception	Deprecated
S3FileSystemException	Deprecated
VersionMismatchException	Deprecated

Package org.apache.hadoop.fs.s3 Description

A distributed, block-based implementation of FileSystem that uses Amazon S3 as a backing store.

Files are stored in S3 as blocks (represented by Block), which have an ID and a length. Block metadata is stored in S3 as a small record (represented by INode) using the URL-encoded path string as a key. Inodes record the file type (regular file or directory) and the list of blocks. This design makes it easy to seek to any given position in a file by reading the inode data to compute which block to access, then using S3's support for HTTP Range headers to start streaming from the correct position. Renames are also efficient since only the inode is moved (by a DELETE followed by a PUT since S3 does not support renames).

For a single file /dir1/file1 which takes two blocks of storage, the file structure in S3 would be something like this:

/
/dir1
/dir1/file1
block-6415776850131549260
block-3026438247347758425

Inodes start with a leading /, while blocks are prefixed with block-.