HBase, a hadoop NoSQL database – Backup Process Explained

Hi Readers, I am happy to post another blog post on how to take HBase backup of a HBase data/ tables in hortonworks sandbox 2.5. Important:  You may get the following error in hbase shell. ERROR: Can't get master address from ZooKeeper; znode data == null Just open ambari(Hortonworks Sandbox) / cloudera manager(Cloudera Sandbox) start the … Continue reading HBase, a hadoop NoSQL database – Backup Process Explained

Hbase, a hadoop NoSQL database-snapshot explained

Hi Readers, I am happy to post another blog post on how to take HBase snapshot of a table in hortonworks sandbox 2.5. I have created a table named 'person' in HBase. hbase(main):032:0> list TABLE person 1 row(s) in 0.080 seconds. I use the scan command to show the data inside the person table. hbase(main):033:0> scan … Continue reading Hbase, a hadoop NoSQL database-snapshot explained

Using map reduce to find max and min temperature for a data set – lab 1

Hi Readers, I am happy to post another blog post on how to use map reduce to find Max and Min temperature of a data set. I have a dataset (say temperaturedata.txt) file. I like to analyze the above data set using map reduce. I have a written a map reduce program to find the max … Continue reading Using map reduce to find max and min temperature for a data set – lab 1