Thanks again this seemed to have fixed the issue I am going through most of the tables as it looks like a few of them are still trying to talk to the old UUID.  ... View more

You have mentioned that NTP is not related to the problem. Let's consider this scenario: 1. Impala Daemon is working with the READ_AT_SNAPSHOT setting enabled. Impala daemon makes a read operation in Kudu. It sets the read timestamp T1 immediately after the preceiding write operation. 2. Kudu despatches the read request to some replica R1. This replica R1 is running on a machine with poorly configured NTP, so the local time on this machine is 1 minute behind. 3. The replica R1 waits for the timeout specified by '--safe_time_max_lag_ms': 30 seconds. After the timeout, the local time is still 30 seconds behind T1 (ideally). Does this lead to the problem under discussion: 'Tablet is lagging too much to be able to serve snapshot scan'? ... View more