Package org.apache.hadoop.fs.http.server

Class FSOperations.FSTruncate

java.lang.Object

org.apache.hadoop.fs.http.server.FSOperations.FSTruncate

All Implemented Interfaces:

FileSystemAccess.FileSystemExecutor<org.json.simple.JSONObject>

Enclosing class:

FSOperations

@Private
public static class FSOperations.FSTruncate
extends java.lang.Object
implements FileSystemAccess.FileSystemExecutor<org.json.simple.JSONObject>

Executor that performs a truncate FileSystemAccess files system operation.

Constructor Summary

Constructors

Constructor	Description
FSTruncate(java.lang.String path, long newLength)	Creates a Truncate executor.

Method Summary

Modifier and Type	Method	Description
org.json.simple.JSONObject	execute(org.apache.hadoop.fs.FileSystem fs)	Executes the filesystem operation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FSTruncate

public FSTruncate(java.lang.String path,
                  long newLength)

Creates a Truncate executor.

Parameters:

path - target path to truncate to.

newLength - The size the file is to be truncated to.

Method Detail

execute

public org.json.simple.JSONObject execute(org.apache.hadoop.fs.FileSystem fs)
                                   throws java.io.IOException

Executes the filesystem operation.

Specified by:

execute in interface FileSystemAccess.FileSystemExecutor<org.json.simple.JSONObject>

Parameters:

fs - filesystem instance to use.

Returns:

true if the file has been truncated to the desired, false if a background process of adjusting the length of the last block has been started, and clients should wait for it to complete before proceeding with further file updates.

Throws:

java.io.IOException - thrown if an IO error occurred.