Since upgrading to CDH 5.2 I've noticed a significant decrease in Impala performance. It appears the table metadata is often timing out/not making it to the nodes:
Missing tables were not received in 120000ms. Load request will be retried.
Requesting prioritized load of table(s):
It will usually keep doing this for periods of time, and then eventually works. As a result it introduces a huge delay in running queries.
Tried just about everything I can think of... anyone have any ideas/experienced this?
We are experiencing the same problem with CDH 4.0. The problem sounds release independent. It would be great if someone could provide some explanation.