By Jean-Marc Spaggiari, Kevin O'Dell
Lots of HBase books, on-line HBase courses, and HBase mailing lists/forums can be found if you want to understand how HBase works. but when you must take a deep dive into use instances, positive factors, and troubleshooting, Architecting HBase purposes is definitely the right resource for you.
With this publication, you’ll research a managed set of APIs that coincide with use-case examples and simply deployed use-case types, in addition to sizing/best practices to aid leap begin your online business program improvement and deployment.
- Learn layout patterns—and not only components—necessary for a profitable HBase deployment
- Go intensive into the entire HBase shell operations and API calls required to enforce documented use cases
- Become acquainted with the commonest concerns confronted via HBase clients, determine the explanations, and comprehend the consequences
- Learn document-specific API calls which are difficult or extremely important for users
- Get use-case examples for each subject presented
Read Online or Download Architecting HBase Applications: A Guidebook for Successful Development and Design PDF
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Extra resources for Architecting HBase Applications: A Guidebook for Successful Development and Design
The only remaining piece is to make sure we can query SOLR to find what we are looking for and then retrieve the Data retrieval | 37 related information from HBase. The HBase retrieval part is the same as what we have already seen above. For SOLR, you can query SOLR using the following code: Example 2-7. Retrieve Avro data from HBase based on SOLR. advance()) break; // The is no more column and we have not reached 10. error("Impossible to find requested cell"); } } Connect to your SOLR cluster.
Now let’s have a look at the mapper. Goal of the mapper is to read the content from HBase and translate it for SOLR. We have already done a class to create an Avro 36 | Chapter 2: Underlying storage engine - Implementation object from an HBase cell. We are going to reuse the same code here as this is exactly what we want to achieve. We want to read each and every cell, convert it back to an Avro object and provide to SOLR the data we want to index. The code for that is the following: Example 2-6.
Error("Impossible to find requested cell"); } } Connect to your SOLR cluster. Adjust this if you are not running SOLR on the same cluster as HBase. Define the SOLR connection you want to use. Configure the request you want SOLR to execute. Here we ask it all the ALERT documents for the NE-555 part. 38 | Chapter 2: Underlying storage engine - Implementation Execute the SOLR request and retrieve the response from the server. Call HBase given the row key of the first document sent back by SOLR. Iterate over the columns for the given key and display the first ten Avro objects retrieved from those columns.