This timeout is used by jobs to acquire a shared access to the warehouse resources during the Data Change stage. DataUpdateWaitSeconds ...

This timeout is used by jobs to acquire a shared access to the warehouse resources during the Data Change stage.  DataUpdateWaitSeconds is how long a job will be waiting in the Running state for another adapter making Schema changes or for Analysis Processing job changing Analysis Database schema.  If the timeout expires before the Schema Change is finished, the job quits and try at a later (scheduled) time.