Unable to get groups for user (invalid) while running application

Hi There,

We are getting below warning continuously while running the application. It looking for the group of an invalid user.Is it going to slow down the jobs or can this be ignored.

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got exception trying to get groups for user appattempt_1449082588263_0178_000001
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got exception trying to get groups for user appattempt_1449082588263_0178_000001: id: appattempt_1449082588263_0178_000001: No such user