November 2014
Beginner to intermediate
164 pages
3h 32m
English
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Implementing filters
We apply column families, column qualifiers, timestamps, or ranges with the get() and scan() operations for limiting the data retrieved. Designing a row key to match the access patterns in every case is not possible, as at times we only need a subset of the data retrieved. Filters provide such a level of fine-grained access, that is, filtering the dataset based on some regular expression. The HBase API provides a filter interface and an abstract class, FilterBase, under the org.apache.hadoop.hbase.filter package, which is further extended by many classes such as CompareFilter, PageFilter, SkipFilter, TimeStampsFilter, and so on, to provide additional functionalities. The following method defined in the Scan class is used to ...
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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.