I think I find the answer. It's the same as I guessed. See this page for more information. It says When you install Sentry, Sentry performs a full Hive metastore snapshot. This causes Hive metastore canary test failures while it synchronizes. Once the snapshot is complete, the canary test will stabilize. ... View more

I also had the same problem last Friday afternoon. I did nothing on the weekend. When I come back this Monday, the problem went away for itself. Our cluster has about 400000 partitions. I think it may take a long time to finish the syncing process from hive to hdfs via senty. But I don't know for sure. Could anyone give me some explanation? ... View more