Get Architecting HBase Applications: A Guidebook for Successful PDF

February 14, 2018 | Data Mining | By admin | 0 Comments

By Jean-Marc Spaggiari, Kevin O'Dell

ISBN-10: 1491915811

ISBN-13: 9781491915813

Plenty of HBase books, on-line HBase courses, and HBase mailing lists/forums can be found if you would like to understand how HBase works. but when you need to take a deep dive into use circumstances, positive factors, and troubleshooting, Architecting HBase purposes is the perfect resource for you. With this booklet, you are going to examine a managed set of APIs that coincide with use-case examples and simply deployed use-case types, in addition to sizing / most sensible practices to aid bounce begin what you are promoting program improvement and deployment.

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Extra resources for Architecting HBase Applications: A Guidebook for Successful Development and Design

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ReadFromHBase: Avro content: {"id": "000a", "eventid": "f92acb5b-079a-42bc-913a-657f270a3dc1", "docType": "FAILURE", "partName": "NE-858", "partNumber": "0-0000-000", "version": 1, "payload": "SXOAXTPSIUFPPNUCIEVQGCIZHCEJBKGWINHKIHFRHWHNATAHAHQBFRAYLOAMQEGKLNZIFM 000a"} With this very small piece of code we have been able to perform the last step of the validation process and retrieved, de-serialized and printed an Avro object from the table. To summarize, we have validated the size of the HFiles, their format, the num‐ bers of entries in the HFiles and in the table, and the table content itself.

HBase provides two different mechanisms to count the rows. info Counting from the shell Counting the rows from the shell is pretty straightforward, simple, and efficient for small examples. It will simply do a full table scan and count the rows one by one. It works well for small tables, however it can take a lot of time for big tables, so we will use this method only when we are sure our tables are small. 1870 seconds The count command takes one to three parameters. The first parameter is manda‐ tory, it is the name of the table whose rows you want to count.

Using the shell The easiest and quickest way to read data from HBase is to use the HBase shell. Using the shell, you can issue commands to retrieve the data you want. The first command is get which will give you a single row. If you specify a column family, it will return only the colums for this family. If you specify both a column family and a column qualifier (separated with a colon), it will return only the specific value if it exists. The second option is to use scan which will return a certain number of rows that we can limit using the LIMIT parameter or the STARTROW and STOPROW parameters.

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Architecting HBase Applications: A Guidebook for Successful Development and Design by Jean-Marc Spaggiari, Kevin O'Dell

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