Overview (Ignite 1.5.0.final)

Common Grid APIs
Package	Description
org.apache.ignite	Contains entry-point Ignite & HPC APIs.
org.apache.ignite.cluster	Contains cluster-related classes.
org.apache.ignite.configuration	Contains configuration-related classes.
org.apache.ignite.lang	Contains general language constructs and functional APIs for distributed computations.
org.apache.ignite.lifecycle	Contains lifecycle-related classes.
org.apache.ignite.resources	Contains resource injection annotations.
org.apache.ignite.scheduler	Contains Job Scheduling functionality.
org.apache.ignite.spi	Contains common classes and interfaces for SPI implementations.
org.apache.ignite.thread	Contains threads-related utility classes.

Messaging APIs
Package	Description
org.apache.ignite.messaging	Contains Topic-based Messaging functionality.

Event Notification APIs
Package	Description
org.apache.ignite.events	Contains Event Subscription functionality together with various events emitted by Ignite.

Compute Grid APIs
Package	Description
org.apache.ignite.compute	Contains Compute Grid functionality.
org.apache.ignite.compute.gridify	Contains APIs utilized for AOP-based grid-enabling.
org.apache.ignite.compute.gridify.aop	Contains common classes for different AOP providers.
org.apache.ignite.compute.gridify.aop.aspectj	Contains all classes used by AspectJ AOP implementation.
org.apache.ignite.compute.gridify.aop.spring	Contains all classes used by Spring AOP implementation.

Data Grid APIs
Package	Description
org.apache.ignite.cache	Contains main Data Grid APIs.
org.apache.ignite.cache.affinity	Contains cache node affinity implementations.
org.apache.ignite.cache.affinity.fair	Contains fair cache affinity for partitioned cache.
org.apache.ignite.cache.affinity.rendezvous	Contains HRW-based cache affinity for partitioned cache.
org.apache.ignite.cache.eviction	Contains cache eviction policy implementations.
org.apache.ignite.cache.eviction.fifo	Contains cache FIFO eviction policy implementations.
org.apache.ignite.cache.eviction.igfs	Contains IGFS LRU eviction policy implementations.
org.apache.ignite.cache.eviction.lru	Contains cache LRU eviction policy implementations.
org.apache.ignite.cache.eviction.random	Contains cache randomized eviction policy implementations.
org.apache.ignite.cache.eviction.sorted	Contains cache sorted eviction policy implementation.
org.apache.ignite.cache.jta	Contains JTA (Java Transaction API) related public classes and interfaces.
org.apache.ignite.cache.jta.jndi	Contains JNDI-based transaction manager lookup.
org.apache.ignite.cache.jta.reflect	Contains reflection-based transaction manager lookup.
org.apache.ignite.cache.query	Contains APIs for creating and executing cache queries.
org.apache.ignite.cache.query.annotations	Contains query-related annotations.
org.apache.ignite.cache.store	Contains cache store interfaces.
org.apache.ignite.cache.store.jdbc	Contains reference JDBC-based cache store implementation.
org.apache.ignite.cache.store.jdbc.dialect	Contains SQL dialects for different RDBMS.
org.apache.ignite.cache.store.spring	Contains cache store session listener based on Spring transaction management.
org.apache.ignite.cache.websession	Contains classes for Web Sessions Caching.
org.apache.ignite.transactions	Contains transaction-related classes.

Service Grid APIs
Package	Description
org.apache.ignite.services	Contains main Managed Services APIs.

File System APIs
Package	Description
org.apache.ignite.igfs	Contains IGnite File System APIs.
org.apache.ignite.igfs.mapreduce	Contains APIs for In-Memory MapReduce over IGFS.
org.apache.ignite.igfs.mapreduce.records	Contains record resolvers for In-Memory MapReduce over IGFS.
org.apache.ignite.igfs.secondary	Contains APIs for IGFS secondary file system.

Hadoop Accelerator APIs
Package	Description
org.apache.ignite.hadoop	Ignite Hadoop Accelerator API.
org.apache.ignite.hadoop.fs	Ignite Hadoop Accelerator file system API.
org.apache.ignite.hadoop.fs.v1	Contains Ignite Hadoop 1.x `FileSystem` implementation.
org.apache.ignite.hadoop.fs.v2	Contains Ignite Hadoop 2.x `FileSystem` implementation.
org.apache.ignite.hadoop.mapreduce	Ignite Hadoop Accelerator map-reduce classes.

Streaming APIs
Package	Description
org.apache.ignite.stream	Contains Ignite Streamer classes.
org.apache.ignite.stream.camel	Contains implementation of Camel Streamer.
org.apache.ignite.stream.flume	Contains implementation of Flume Sink.
org.apache.ignite.stream.jms11	Contains implementation of JMS queue and topic messages consumer.
org.apache.ignite.stream.kafka	Contains implementation of Kafka Streamer.
org.apache.ignite.stream.mqtt	Contains implementation of MQTT topic messages consumer.
org.apache.ignite.stream.socket	Contains socket streamer implementation.
org.apache.ignite.stream.twitter	Contains implementation of Twitter Streamer.

Security APIs
Package	Description
org.apache.ignite.plugin.security	Contains APIs for security, authentication, and authorization.
org.apache.ignite.ssl	Contains classes for working with SSL.

MXBeans classes
Package	Description
org.apache.ignite.mxbean	Contains annotations for Dynamic MBeans.

SPI: CheckPoint
Package	Description
org.apache.ignite.spi.checkpoint	Contains APIs for checkpoint SPI.
org.apache.ignite.spi.checkpoint.cache	Contains cache-based implementation for checkpoint SPI.
org.apache.ignite.spi.checkpoint.jdbc	Contains JDBC implementation for checkpoint SPI.
org.apache.ignite.spi.checkpoint.noop	Contains default no-op checkpoint SPI implementation.
org.apache.ignite.spi.checkpoint.s3	Contains S3-based implementation for checkpoint SPI.
org.apache.ignite.spi.checkpoint.sharedfs	Contains shared file system implementation for checkpoint SPI.

SPI: Collision
Package	Description
org.apache.ignite.spi.collision	Contains APIs for collision SPI.
org.apache.ignite.spi.collision.fifoqueue	Contains FIFO based collision SPI implementation.
org.apache.ignite.spi.collision.jobstealing	Contains job stealing collision SPI implementation.
org.apache.ignite.spi.collision.noop	Contains default no-op collision SPI implementation.
org.apache.ignite.spi.collision.priorityqueue	Contains priority based collision SPI implementation.

SPI: Indexing
Package	Description
org.apache.ignite.spi.indexing	Contains APIs for indexing SPI.
org.apache.ignite.spi.indexing.noop	Contains default no-op indexing SPI implementation.

SPI: Load Balancing
Package	Description
org.apache.ignite.spi.loadbalancing	Contains APIs for load balancing SPI.
org.apache.ignite.spi.loadbalancing.adaptive	Contains adaptive load balancing SPI.
org.apache.ignite.spi.loadbalancing.roundrobin	Contains default round-robin implementation for load balancing SPI.
org.apache.ignite.spi.loadbalancing.weightedrandom	Contains weighted random-base implementation for load balancing SPI.

SPI: Communication
Package	Description
org.apache.ignite.spi.communication	Contains APIs for grid communication SPI.
org.apache.ignite.spi.communication.tcp	Contains default TCP/IP-based implementation for communication SPI.

SPI: Deployment
Package	Description
org.apache.ignite.spi.deployment	Contains APIs for deployment SPI.
org.apache.ignite.spi.deployment.local	Contains default local deployment SPI implementation.
org.apache.ignite.spi.deployment.uri	Contains URI-based deployment SPI implementation.

SPI: Swap Space
Package	Description
org.apache.ignite.spi.swapspace	Contains APIs for swap space SPI.
org.apache.ignite.spi.swapspace.file	Contains file-based swap space SPI.
org.apache.ignite.spi.swapspace.noop	Contains default no-op swap space SPI implementation.

SPI: Discovery
Package	Description
org.apache.ignite.spi.discovery	Contains APIs for topology manager SPI.
org.apache.ignite.spi.discovery.tcp	Contains default TCP/IP implementation for discovery SPI.
org.apache.ignite.spi.discovery.tcp.ipfinder	Contains IP finder interface and adapter.
org.apache.ignite.spi.discovery.tcp.ipfinder.cloud	Contains Apache jclouds based IP finder.
org.apache.ignite.spi.discovery.tcp.ipfinder.gce	Contains Google Cloud Storage IP finder.
org.apache.ignite.spi.discovery.tcp.ipfinder.jdbc	Contains JDBC IP finder implementation.
org.apache.ignite.spi.discovery.tcp.ipfinder.multicast	Contains multicast-based IP finder.
org.apache.ignite.spi.discovery.tcp.ipfinder.s3	Contains AWS S3-based IP finder.
org.apache.ignite.spi.discovery.tcp.ipfinder.sharedfs	Contains shared filesystem-based IP finder.
org.apache.ignite.spi.discovery.tcp.ipfinder.vm	Contains local JVM-based IP finder.
org.apache.ignite.spi.discovery.tcp.ipfinder.zk	Contains TCP Discovery IP Finder uses Apache ZooKeeper (ZK) to locate peer nodes.

SPI: Failover
Package	Description
org.apache.ignite.spi.failover	Contains APIs for failover SPI.
org.apache.ignite.spi.failover.always	Contains default "always" failover SPI.
org.apache.ignite.spi.failover.jobstealing	Contains job stealing failover SPI.
org.apache.ignite.spi.failover.never	Contains "never" failover SPI.

SPI: Event Storage
Package	Description
org.apache.ignite.spi.eventstorage	Contains APIs for event storage SPI.
org.apache.ignite.spi.eventstorage.memory	Contains default in-memory implementation for event storage SPI.

Segmentation Detection
Package	Description
org.apache.ignite.plugin.segmentation	Contains segmentation "split-brain" related classes.

Ignite plugin API
Package	Description
org.apache.ignite.plugin	Contains plugins management API.
org.apache.ignite.plugin.extensions.communication	Contains extendable components for communication.

Logging
Package	Description
org.apache.ignite.logger	Contains logging functionality used throughout the system.
org.apache.ignite.logger.java	Contains Java logging implementation for logging.
org.apache.ignite.logger.jcl	Contains Jakarta commons logging implementation for logging.
org.apache.ignite.logger.log4j	Contains default Log4j implementation for logging.
org.apache.ignite.logger.log4j2	Contains default Log4j2 implementation for logging.
org.apache.ignite.logger.slf4j	Contains SLF4J implementation for logging.

Loaders
Package	Description
org.apache.ignite.startup	Contains Ignite runtime startup classes.
org.apache.ignite.startup.cmdline	Contains default command line startup.
org.apache.ignite.startup.servlet	Contains servlet-based startup.

Marshallers
Package	Description
org.apache.ignite.marshaller	Contains various supported marshallers.
org.apache.ignite.marshaller.jdk	Contains JDK `java.io` based marshaller.
org.apache.ignite.marshaller.optimized	Contains Optimized marshaller.

Ignite Binary Objects API
Package	Description
org.apache.ignite.binary	Contains Ignite Binary Objects API classes.

Visor Plugins
Package	Description
org.apache.ignite.visor.plugin	Contains Visor Plugin extension functionality.

Spring Integration
Package	Description
org.apache.ignite.cache.spring	Contains implementation of Spring cache abstraction and `@Cacheable` annotation.
org.apache.ignite.transactions.spring	Contains implementation of Spring transaction manager.

Mesos Framework
Package	Description
org.apache.ignite.mesos	Contains classes to support integration with Apache Mesos.
org.apache.ignite.mesos.resource	Contains classes provide access to resources.

Yarn Integration
Package	Description
org.apache.ignite.yarn	Contains classes to support integration with Apache Hadoop Yarn.
org.apache.ignite.yarn.utils	Utility and helper classes.

Platforms
Package	Description
org.apache.ignite.platform	Contains platform-related classes.
org.apache.ignite.platform.cpp	Contains C++ platform-related classes.
org.apache.ignite.platform.dotnet	Contains .Net platform-related classes.

OSGi integration
Package	Description
org.apache.ignite.osgi	Contains OSGi related classes.
org.apache.ignite.osgi.classloaders	Contains implementation of OSGi class loaders.