Hi All,
We just upgraded from 0.10.x to 1.1 and enabled rack awareness on an existing
clusters which has about 20 nodes in 4 rack . After this we see that few
brokers goes on continuous expand and shrink ISR to itself cycle , it is also
causing high time for serving meta data requests.
What is the impact of enabling rack awareness on existing cluster assuming
replication factor is 3 and all existing replica may or may not be in different
rack when rack awareness was enabled after which a rolling bounce was done.
Symptoms we are having are replica lag and slow metadata requests. Also in
brokers log we continuously see disconnection from the broker where it is
trying to expand.
Thanks for helping
--A
