Whenever the mapper process is completed before tasktracker emits the result . Task tracker keep the output in the LFS(Local file system) in the same node.
Note : - Data localization is for mapper phase but not for sort & shuffle and reducer phase.
Life of mapper output is till the end of job completion i.e as the job completion success or failure the local copies of mapper o/p will automatically revoked by mapper only.
No comments:
Post a Comment