evlingkar

Neo4j is an open-source graph database, implemented in Java.The developers describe Neo4j as "embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs rather than in tables". Neo4j is the most popular graph database Data Structure: In Neo4j, everything is stored in form of nodes and relationships. Each node and relationship can have any number of attributes. Both the nodes and relationship can be labelled. Labeling is useful, because you can narrow down your searching area using the labels. Neo4j suported node indexing. What is Neo4j? Neo4j is an open-source graph database supported by Neo Technology. Neo4j stores data in nodes and relationships with properties on both are connected by directed(-> or <- or -). Features: intuitive, using a graph model for data representation reliable, with full ACID transactions durable and fast, using a custom disk-based, native storage engine massively scalable, up to sev...

Pig provides extensive support for user defined functions (UDFs) as a way to specify custom processing. Pig UDFs can currently be implemented in three languages: Java, Python, JavaScript, Ruby and Groovy. The most extensive support is provided for Java functions. You can customize all parts of the processing including data load/store, column transformation, and aggregation. Java functions are also more efficient because they are implemented in the same language as Pig and because additional interfaces are supported such as the Algebraic Interface and the Accumulator Interface. Limited support is provided for Python, JavaScript, Ruby and Groovy functions. These functions are new, still evolving, additions to the system. Currently only the basic interface is supported; load/store functions are not supported. Furthermore, JavaScript, Ruby and Groovy are provided as experimental features because they did not go through the same amount of testing as Java or Python. At runtime note t...