© Deepak Vohra 2016

Deepak Vohra, Apache HBase Primer, 10.1007/978-1-4842-2424-3_10

10. Finding a Row in a Table

Deepak Vohra1 

(1)Apt 105, White Rock, British Columbia, Canada

In this chapter I discuss how a row in a Apache HBase table is found. The sequence used to find a row/s is as follows:

  1. HBase identifies the file/s (HFiles) that store/s the row/s requested using the metadata

  2. Each HFile keeps a block index that identifies the block in the HFile where a row is found

  3. After finding the block that could contain a row, HBase scans the block to retrieve all key/value pairs requested, and copy of the key/value pairs is stored in the block cache in memory

  4. The requested row is returned to the client

  5. Subsequent requests for the same row/s get served from ...

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