@Override
        public void run() {
          populateIds(br, hashes);
        }
Reads from a file and populates the indexes and issues
random read requests and tracks performance . This test reads 10000 ids
at a time from the index write performance log and does random reads from that list.
After 2 minutes it replaces the input with the next 10000 set.
ambry-tools/src/main/java/com/github/ambry/store/IndexReadPerformance.java