How do I stop Replication within Replica-set in MongoDB

Is there any single command/short process to stop/pause the Replication within a Replica Set (Not Shard enabled) instead following the below long process. 1. PRIMARY> rs.remove(secondary.host.name:port); 2. restart secondary without –replSet 3. do your activity 4. restart secondary with –replSet,…

MongoDB Admin user creation script

## Copy this script to your mongo /bin folder ################################# ID=`id -u -n` echo echo ” AdminUserCreation.sh script is executed by user : $ID” echo echo ” Date and Time of Execution : `date`” echo read -p “Enter the port…

MongoDB User management shell script

MongoDB User management shell script #!/bin/bash ## Copy this script to your mongo /bin folder ################################# PWP_HOME=/opt/pwp/3.0 MONGO_HOME=/apps/bin SCRIPTS=/apps/UMG_Menu/Scripts HOME=/apps/UMG_Menu/UMG_PWP LOGS=/apps/UMG_Menu/ScriptLogs TIMESTAMP=`date +%d-%m-%y_%H:%M:%S` DATE=`date +%d-%m-%y` db=admin local_host=`hostname` ID=`id -u -n` echo echo ” User_Management.sh script is executed by user :…

There is no reason at all to use MySQL !

MySQL was once the most popular open source database (it still is), but it’s popularity and deployment is declining under the ownership of Oracle. The founder of MySQL Michael Widenius “Monty” was not happy when Oracle announced to acquire MySQL…

Write file to HDFS/Hadoop Read File From HDFS/Hadoop Using Java

import java.io.File; import java.io.IOException; import java.net.URI; import java.net.URISyntaxException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FSDataInputStream; import org.apache.hadoop.fs.FSDataOutputStream; import org.apache.hadoop.fs.FileStatus; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.hdfs.DistributedFileSystem; /** * * @author    Srinivas * @email     srinivas@dbversity.com * @Web       www.dbversity.com */ public class WritetoHDFSReadFromHDFSWritToLocal {     private…

Writing Hadoop MapReduce Program in Python

Map step: mapper.py It will read data from STDIN, split it into words and output a list of lines mapping words to their (intermediate) counts to STDOUT. The Map script will not compute an (intermediate) sum of a word’s occurrences…

Prevent accidental data loss in Hadoop

Some time you have accidentally delete some file which you are not suppose to do. So what will you do in that case? The option with you is to enable trash (Recycle bin) for hadoop, and define fs.trash.interval to one…

Warning: $HADOOP_HOME is deprecated

Do you have below warnings issue for every command with your Hadoop set-up ? Warning: $HADOOP_HOME is deprecated. [root@hostname logs]# hadoop dfs -ls / Warning: $HADOOP_HOME is deprecated. Found 3 items drwxr-xr-x – root supergroup 0 2014-07-09 09:06 /hadoop drwxr-xr-x…

NUMA (Non Uniform Memory Access) for MongoDB

From our internal testing we did see some performance boost when NUMA was disabled using -> numactl –interleave=all ….. Below are the details from MongoDB http://docs.mongodb.org/manual/administration/production-notes/ Running MongoDB on a system with Non-Uniform Access Memory (NUMA) can cause a number…

Openings with MongoDB for Developers

MongoDB Do you want to work at MongoDB, Inc. and be part of a revolution in database software? Check out our open positions buff.ly/1owu5RP Development Should Be Simple and Beautiful buff.ly MongoDB would not be the leading NoSQL database without…