This document provides an overview of Apache Ignite 1.5, an in-memory data fabric for high performance computing. It discusses key components including the distributed in-memory data grid, caching APIs, distributed SQL queries, off-heap storage, eviction policies, persistence, data rebalancing, and different types of cache queries. The data grid implements JCache and allows for distributed transactions on large datasets in real-time. It provides a unified architecture for distributed caching, processing, and analytics.

1. S U R I N D E R
2 9 T H J U L Y , 2 0 1 6
In-Memory Data Fabric
Apache Ignite 1.5

2. Data Fabric

3. Introduction
 A collection of independent, well-integrated, in-
memory components
 high-performance, integrated and distributed in-
memory platform
 transacting on large-scale data sets in real-time
 faster than possible with traditional disk-based
or flash technologies

4. Data Grid
 Distributed In-Memory
Caching
 Implements JCache (JSR
107)
 Distributed In-Memory
Transactions
 Data Consistency
 Tiered Off-Heap Storage
 Distributed ANSI-99
SQL Queries with
support for Joins

5. Keep required backup
Everyone knows
everything
Cache Modes

6. Cache Queries…
 Scan Query : return data matching BiPredicate
 Predicate sent to each node,
 Node scan its cache
 Data consolidated by requested node
 Sql Query : load data based on sql given
 Needs indexing to be enabled
 Registering indexing in config
 Annotations for fields visibility
 H2 Console for debugging
 Text Query : Query cache object on given value
 TextQuery txt = new TextQuery(Person.class, "Master Degree");

7. Cache Queries contd..
 Continuous Query : listens to change in data that fall
into filter
 Initial Query(any of fro previous slide)
 Remote Filter : evaluate the key on primary node to notify
local listener about the changes
 Local Listener : Perform the intended task when it get
notification about the change in data.

8. Off Heap Memory
 data can be stored and moved between on-
heap, off-heap, and swap space
 On Heap Tiered : stores on heap, evict to off heap
and then may evict to swap space(default mode)
 Off Heap Tiered : bypass on heap, may evict to swap
space
 Off Heap Values : Keys On heap and values off
Heap.
 Useful when keys are small and values are huge
 Swap Space : Disk space to evict data exceeding on
heap and off heap

9. Eviction Policies
 LRU : recommended when in doubt
 FIFO : it ignores the element access order
 Random
 Randomly evict any element
 Used for debugging
 Not beneficial when data fits in memory

10. Persistent Store
 CacheStore implements cacheLoader and
cacheWriter from JCache
 Read through
 Write through
 Write behind
 Works behind the cache API’s

11. Data Rebalancing
 Used when new node join the grid
 Possibly more backups than configured in such scenarios
 Rebalance Modes
 SYNC: cache calls blocked until rebalancing is completed
 ASYNC: rebalancing happen in background. Cache respond immediately
 NONE : No rebalancing, cache loaded on demand when required or
explicitly loading

12. Questions