I am using Phoenix 4.3.0 on CDH5.4 Cluster.
I have a daily batch process that upserts values to an entire Pheonix table (there are no new records in each run, only updated values to all columns on each row).
We have noticed that after 10-20 full runs, SELECT queries that contains WHERE clauses take long time to execute (from ~0.5s to ~7s).
We dropped and created the table on the next run and the problem was solved.

Is there any connection to the fact that all rows are being UPSERTED?