Hadoop Architecture

Architecture overview

Hadoop has three core components, plus ZooKeeper if you want to enable high availability:

  • Hadoop Distributed File System (HDFS)
  • MapReduce
  • Yet Another Resource Negotiator (YARN)
  • ZooKeeper

HDFS architecture

The Hadoop Distributed File System (HDFS) is the underlying file system of a Hadoop cluster. It provides scalable, fault-tolerant, rack-aware data storage designed to be deployed on commodity hardware. Several attributes set HDFS apart from other distributed file systems. Among them, some of the key differentiators are that HDFS is:

  • designed with hardware failure in mind
  • built for large datasets, with a default block size of 128 MB
  • optimized for sequential operations
  • rack-aware
  • cross-platform and supports heterogeneous clusters

Data in a Hadoop cluster is broken down into smaller units (called blocks) and distributed throughout the cluster. Each block is duplicated twice (for a total of three copies), with the two replicas stored on two nodes in a rack somewhere else in the cluster. Since the data has a default replication factor of three, it is highly available and fault-tolerant. If a copy is lost (because of machine failure, for example), HDFS will automatically re-replicate it elsewhere in the cluster, ensuring that the threefold replication factor is maintained.

HDFS architecture can vary, depending on the Hadoop version and features needed:

  • Vanilla HDFS
  • High-availability HDFS

HDFS is based on a leader/follower architecture. Each cluster is typically composed of a single NameNode, an optional SecondaryNameNode (for data recovery in the event of failure), and an arbitrary number of DataNodes.

In addition to managing the file system namespace and associated metadata (file-to-block maps), the NameNode acts as the master and brokers access to files by clients (though once brokered, clients communicate directly with DataNodes). The NameNode operates entirely in memory, persisting its state to disk. It represents a single point of failure for a Hadoop cluster that is not running in high-availability mode. To mitigate against this, production clusters typically persist state to two local disks (in case of a single disk failure) and also to an NFS-mounted volume (in case of total machine failure). In high-availability mode, Hadoop maintains a standby NameNode to guard against failures. Earlier versions of Hadoop offered an alternative with the introduction of the SecondaryNameNode concept, and many clusters today still operate with a SecondaryNameNode.

To understand the function of the SecondaryNameNode requires an explanation of the mechanism by which the NameNode stores its state.

Namenode

The namenode is the commodity hardware that contains the GNU/Linux operating system and the namenode software. It is a software that can be run on commodity hardware. The system having the namenode acts as the master server and it does the following tasks:

  • Manages the file system namespace.
  • Regulates client’s access to files.
  • It also executes file system operations such as renaming, closing, and opening files and directories.

Datanode

The datanode is a commodity hardware having the GNU/Linux operating system and datanode software. For every node (Commodity hardware/System) in a cluster, there will be a datanode. These nodes manage the data storage of their system.

  • Datanodes perform read-write operations on the file systems, as per client request.
  • They also perform operations such as block creation, deletion, and replication according to the instructions of the namenode.

Block

Generally the user data is stored in the files of HDFS. The file in a file system will be divided into one or more segments and/or stored in individual data nodes. These file segments are called as blocks. In other words, the minimum amount of data that HDFS can read or write is called a Block. The default block size is 64MB, but it can be increased as per the need to change in HDFS configuration.

Goals of HDFS

  • Fault detection and recovery : Since HDFS includes a large number of commodity hardware, failure of components is frequent. Therefore HDFS should have mechanisms for quick and automatic fault detection and recovery.
  • Huge datasets : HDFS should have hundreds of nodes per cluster to manage the applications having huge datasets.
  • Hardware at data : A requested task can be done efficiently, when the computation takes place near the data. Especially where huge datasets are involved, it reduces the network traffic and increases the throughput
About Mitra N Mishra 35 Articles
Mitra N Mishra is working as a full-stack data scientist.

372 Comments

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