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You could check the coordinator logs to see if the segments for this datasource are being assigned to historicals

tail the coordinator log sometimes: • the historical is not ping-able • the number of segment files to move is too low

I check coordinator log not find some error logs but I try to switch coordinator: i have two nodes to play coordinator so I kill one of then and master switch to another:at this point segments start to load i happens serveral times. I need to trigger coordinator switch to start segments to load. this happens usually after historical nodes crash and recover