A file will be divided into blocks (by default 128 MB) and those blocks will be physically stored as part of servers where datanode process is running. For example, a 1 GB file will be divided into 8 blocks of 128 MB each and a 200 MB file will be divided into 2 blocks of …
Let us copy data into HDFS and understand details about how data is stored in HDFS. hadoop fs is the main command using which we can copy and manage files in HDFS. https://gist.github.com/dgadiraju/3ef7a526ff1b047f5955ff61bfd9c38c
Here are the steps involved in setting up HDFS using Cloudera Manager. Choose the dropdown of cluster Cluster 1 Click on Add Service Choose HDFS Configure Namenode – bigdataserver-2 Configure Secondary Namenode – bigdataserver-3 Configure Data Nodes – bigdataserver-5 to bigdataserver-7 Once the HDFS is started, click on the instances and choose Add Role Instances …
As part of this section we will see how to set up HDFS components such as Namenode, Secondary Namenode, Datanodes etc while exploring some of the key concepts of this very important service. Setup HDFS Copy Data into HDFS Components of HDFS Configuration Files and Important Properties Review Web UIs and log files Checkpointing and …
Zookeeper have bunch of commands to get the information about the services managed by Zookeeper as well as Zookeeper itself. Make sure to create softlink for java executable so that zkCli.sh can run. zkCli.sh or zookeeper-shell.sh – It is primarily to get details about services Here are some sample commands. Be careful while running rmr …
Quite often we will have distributed services running on multiple servers (especially masters, for e.g.: Active/Passive Namenode of HDFS). Zookeeper can keep track of the multiple servers associated with a distributed service and ensure that it serves the clients of that service with High Availability and Fault Tolerance. Zookeeper service handles the following functions in …
