[kshk123]

Thank you very much for your review comments. Please find my answers below. All the hash buckets are allocated upfront so that there is no need for a global map. If I want to allocate the hash buckets later, there will be a need to take a hashmap-level-lock, which will hamper the concurrency of the map. Yes, using the std containers will make life easy. I was trying to have my own data structure in place, but there is no particular reason for it. I might move to the std containers in later version.