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
