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From "Jihoon Son (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TAJO-367) Separate the locality information from Fragment
Date Tue, 03 Dec 2013 05:07:35 GMT
Jihoon Son created TAJO-367:

             Summary: Separate the locality information from Fragment
                 Key: TAJO-367
                 URL: https://issues.apache.org/jira/browse/TAJO-367
             Project: Tajo
          Issue Type: Improvement
          Components: master, storage, worker
            Reporter: Jihoon Son
             Fix For: 0.8-incubating

Fragment is designed to represent a portion of the abstracted input source.
However, since It is currently used for the task scheduling and the task allocation, it includes
the locality information as well as the abstraction of the input data.
The locality information is used only in the task scheduling, and thus the locality information
should be separated from Fragment.

The locality information is used in the task scheduling to assign tasks to workers closes
to the data regardless of the kind of the storage layer.
To consider input data and their locality in the task scheduler, we need to design a new class
including a Fragment and the locality information such as FragmentWithHost.

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