"Where can i add this prefix in my row key? It's coding some file, or it's implemented backwards in SQL?" You add it to your code which is ingesting data into HBase. That is the most simple way to implement this logic. "if i have a prefix in my row key, if i want to select a specific row key
in hbase i won't know what prefix that row key have, this is a
limitation or am i seeing thins wrong?" Yes, this is a limitation of your "formula". For salt/hashing, you want a stable hash such that, with the actual data in the rowKey, you can compute what the salt/hash is. I'd recommend that you use Apache Phoenix if you want to implement salting. It provides this as a feature and would likely save you a bit of time/effort.
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