November 2014
Beginner to intermediate
326 pages
7h 4m
English
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Versioning and why
As we already discussed version for a record, there is a tuple consisting of {row, column, version} that defines a cell and its value. We can have as many versions as we want, but the number of versions should be decided optimally as it is storage dependent. It means the more versions, the more disk space it requires (it is possible to have an unbounded number of cell versions).
The version is denoted using a long value. The versioned values are stored in descending order so as to keep the most recent value on top. So, when we fetch records, the most recent version is returned.
Let's consider a scenario to version HBase.
Suppose we have an employee database with the employee_history table where we need to keep all the details of ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.