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Run SparkCleanup service per individual Instance group instead of centrally
We would like SparkCleanup service to run as execution user of each individual Instance Group, rather than centrally as cluster admin. This will avoid the need to do preliminary work to make sure execution users of SIG are part of cluster admin unix group and permissions are correct. In addition this will prevent data sharing security issue, since currently all the users are able to access each other shuffle files, since they belong to the same unix group
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