How to cancel a content deployment job in SharePoint 2010

To cancel a content deployment job

You cannot perform this task by using Windows PowerShell cmdlets. You must use the SharePoint Central Administration Web site instead.

• Verify that you have the following administrative credentials:
• You must be a member of the Farm Administrators group on the Central Administration server.
• On the Central Administration Web site, in the General Application Settings section, click Configure content deployment paths and jobs.
• On the Manage Content Deployment Paths and Jobs page, on the menu for the job that you want to cancel, click Cancel.
• The status of the job is reported in the Status column.

Ref: http://technet.microsoft.com/en-us/library/cc262075%28v=office.14%29.aspx#Section4