Hadoop, the most popular open-source distributed framework has arrived with a new release 3.x. It brings promising features and enhancements, but here we will demystify the Hadoop 3.0 Architecture in detail. The difference between Hadoop 3.0 & Hadoop 2.0 is already talked a lot but how all such changes fit into Hadoop 3.0 architecture will give you a better insight and make you a better aware developer.
Lets see how Hadoop 3.0 architecture evolved from its initial release in 2006 till Hadoop 2.x version. Hadoop 2.x has much improved architecture with YARN and building blocks look more flexible.
As data started growing and enterprise working on Enterprise Data Lake (EDL) solution, optimizing the cost of storage is one of the key concern. The underline development programming language (Java) also moved moved forward to 1.8 with many enhanced feature, the adoption is must for Hadoop community. YARN improvement, Task Level Native Optimization, Derive heap size automatically, Schedule enhancement, Change of default ports, Client side class path isolation are the other changes which brought the new architecture for Hadoop 3.0
Hadoop 3.0 Architecture for HDFS
HDFS 2.x current implementation has 200% of space overhead. Each data block is copied to two other data nodes. This is a very simple, scalable and robust architecture but has too much of space overhead.
HDFS 3.0 architecture is implemented by Erasure Coding
Hadoop 3.0 Downstream Compatibility
Following are the version compatibility matrix sheet indication the version of different Apache projects and their unit test status including basic functionality testing. This was done as part of Hadoop 3.0 Beta 1 release in Oct 2017.
| Apache Project | Version | Compiles | Unit Testing Status | Basic Functional Testing |
|---|---|---|---|---|
| HBase | 2.0.0 | |||
| Spark | 2.0 | |||
| Hive | 2.1.0 | |||
| Oozie | 5.0 | |||
| Pig | 0.16 | |||
| Solr | 6.x | |||
| Kafka | 0.10 |
More on Hadoop 3.0 Related Topics
| # | Other Articles | Link |
|---|---|---|
| 1 | All the newly added features and enhancements in Hadoop 3.0 | Hadoop 3.0 features and enhancement |
| 2 | Detailed comparison between Hadoop 3.0 vs Hadoop 2.0 and what benefit it brings to the developer | Hadoop 3.0 vs Hadoop 2.0 |
| 3 | Hadoop 3.0 Installation | Hadoop 3.0 Installation |
| 4 | Hadoop 3.0 Release Date | Hadoop 3.0 Release Date |
| 5 | Hadoop 3. 0 Security Book | Hadoop 3.0 Security by Ben and Joey |
| 6 | Demystify The Hadoop 3.0 Architecture and its components | Hadoop 3.0 Architecture |
| 7 | Hadoop 3.0 & Hortonworks Support for it in HDP 3.0 Release | Hadoop 3.0 Hortonworks |
Hadoop 3.0 vs Hadoop 2.0
Hadoop 3.0 vs Hadoop 2.0 : Hadoop 3.0.0 GA (General Availability) is released on 13-Dec-2017. Everybody wants to know what it brings into the table for developer, administrator and enterprise IT. There are top 8 focus area where Hadoop 3.0 shows improvement over Hadoop 2.0. these attributes sure indicates that Hadoop 3.0 is much more better & easier for developers, cost saving for enterprise and more manageable for administrators
8 Key Comparison Factor : Hadoop 3.0 vs Hadoop 2.0
Look at the below comparison table where it clearly says what Hadoop 3.0 is promising. It brings lot of cook features for big data engineers to make their life easier.
The key Hadoop 3.0 new features and enhancement are as follows
- Java 8 (jdk 1.8) as runtime for Hadoop 3.0
- Erasure Encoding for to reduce storage cost
- YARN Timeline Service v.2 (YARN-2928)
- New Default Ports for Several Services
- Intra-DataNode Balancer
- Shell Script Rewrite (HADOOP-9902)
- Shaded Client Jars
- Support for Opportunistic Containers
- MapReduce Task-Level Native Optimization
- Support for More than 2 NameNodes
- Support for Filesystem Connector
- Reworked Daemon and Task Heap Management
- Improved Fault-tolerance with Quorum Journal Manager
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