data.tar.gz

HADOOP_HOME

JAVA_HOME

HDFS_NAMENODE_USER

HDFS_DATANODE_USER

HDFS_SECONDARYNAMENODE_USER

YARN_RESOURCEMANAGER_USER

YARN_NODEMANAGER_USER

HADOOP_CONF_DIR

ZK_HOME

PIG_HOME

AvroWriteExample

AvroReadExample

AvroGeneratedCodeReadExample

AvroGeneratedCodeWriteExample

AvroRPCExample

ParquetReadExampleJob

ParquetWriteExampleJob

ParquetAvroReadExampleJob

ParquetAvroWriteExampleJob

ParquetProjectionReadExampleJob

SequenceFileReadExampleJob

SequenceFileWriteExampleJob

SequenceFileSyncPointExampleJob

TestCarMapperJob

TestCarReducerJob

CarCounterMrProgramJob

MyLiveAppJob

DataNodeWebUI2

YarnWebUI

YarnWebUI-copy

YarnWebUI-copy-copy

JHS-UI

Spark-UI-copy

Spark-History-Server-UI-3

This course offers a one-of-a-kind rich and interactive experience to learn the fundamentals and basics of Big Data. Throughout this course, you will have plenty of opportunities to get your hands dirty with functioning Hadoop clusters.

You will start off by learning about the rise of Big Data as well as the different types of data like structured, unstructured, and semi-structured data. You will then dive into the fundamentals of Big Data such as YARN (yet another resource manager), MapReduce, HDFS (Hadoop Distributed File System), and Spark.

By the end of this course, you will have the foundations in place to start working with Big Data, which is a massively growing field.

Introduction to Big Data and Hadoop

## DataNodes

The Datanode stores the actual data. It stores the data blocks on its local filesystem and sends a block report to the Namenode.

The data for HDFS files will be stored in the directory specified as the value for the configuration setting `dfs.datanode.data.dir`. The default value of this setting is `${hadoop.tmp.dir}/dfs/data`. In our terminal setup the data directory is located at `usr/local/tmp/dfs/data/`. We'll upload a file to HDFS containing a string; the corresponding data is written to the local disk of the DataNode. Execute the commands in the terminal and examine the outcome. A screen-shot of the directory with the data appears below:

# DataNodes

The Datanode stores the actual data. It stores the data blocks on its local filesystem and sends a block report to the Namenode.

The data for HDFS files will be stored in the directory specified as the value for the configuration setting `dfs.datanode.data.dir`. The default value of this setting is `${hadoop.tmp.dir}/dfs/data`. In our terminal setup the data directory is located at `usr/local/tmp/dfs/data/`. We'll upload a file to HDFS containing a string; the corresponding data is written to the local disk of the DataNode. Execute the commands in the terminal and examine the outcome. A screen-shot of the directory with the data appears below:

# DataNodes

The Datanode stores the actual data. It stores the data blocks on its local filesystem and sends a block report to the Namenode.

The data for HDFS files will be stored in the directory specified as the value for the configuration setting `dfs.datanode.data.dir`. The default value of this setting is `＄{hadoop.tmp.dir}/dfs/data`. In our terminal setup the data directory is located at `usr/local/tmp/dfs/data/`. We'll upload a file to HDFS containing a string; the corresponding data is written to the local disk of the DataNode. Execute the commands in the terminal and examine the outcome. A screen-shot of the directory with the data appears below:

This lesson explains the role of Datanode in HDFS.

Datanode

Hadoop

YARN

Map Reduce

HDFS

Spark

Input & Output Formats

Misc

Quiz

Reference: Replication

Reference: Partitioning

Reference: Transactions

Reference: Issues in Distributed Systems

Datanode

DataNodes