Chapter 5. Extending HBase with coprocessors


This chapter covers
  • Coprocessors and how to use them effectively
  • Types of coprocessors: observer and endpoint
  • How to configure and validate coprocessor installation on your cluster


Everything you’ve seen of HBase as an online system is centered on data access. The five HBase commands introduced in chapter 2 are exclusively for reading or writing data. For the HBase cluster, the most computationally expensive portion of any of those operations occurs when applying server-side filters on Scan results. Even so, this computation is extremely specific to accessing the data. You can use custom filters to push application logic onto the cluster, but filters are constrained to the context of a single ...

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