Bulk Mutation in an Integration Data Lake with Spark Data lakes act as repository of data from various sources, possibly of different formats. It can be used to build data warehouse or to perform other [...]
Learning Alarm Threshold from User Feedback using Decision Tree on Spark Alarm fatigue is a phenomena where some one is exposed to large number of alarms, become desensitized to them and start ignoring them. It’s been reported [...]
Pluggable Rule Driven Data Validation with Spark Data validation is an essential component in any ETL data pipeline. As we all know most Data Engineers and Scientist spend most of their time cleaning and preparing their [...]
Improving Elastic Search Query Result with Query Expansion using Topic Modeling Query expansion is a process of reformulating a query to improve query results and to be more specific to improve the recall for a [...]
In Cassandra, rows are hash partitioned by default. If you want to data sorted by some attribute, column name sorting feature of Cassandra is usually exploited. If you look at the Cassandra slice range API, [...]
Hive Plays Well with JSON Hive is an abstraction on Hadoop Map Reduce. It provides a SQL like interface for querying HDFS data, whch accounts for most of it’s popularity. In Hive, table structured data [...]
Removing Duplicates from Order Data Using Spark If you work with data, there is a high probability that you have run into duplicate data in your data set. Removing duplicates in Big Data is a [...]
Storing Nested Objects in Cassandra with Composite Columns One of the popular features of MongoDB is the ability to store arbitrarily nested objects and be able to index on any nested field. In this post I will show [...]
Data Normalization with Spark Data normalization is a required data preparation step for many Machine Learning algorithms. These algorithms are sensitive to the relative values of the feature attributes. Data normalization is the process of bringing all the attribute [...]
Anomaly Detection with Robust Zscore Anomaly detection with with various statistical modeling based techniques are simple and effective. The Zscore based technique is one among them. Zscore is defined as the absolute difference between a [...]