How to get the windows operating system version from command prompt

Open command prompt

Navigate to C:\Windows\System32

Run winver.exe to get the version of operating system

ERROR: Attempting to operate on hdfs datanode as root

Getting error when we tried to start hadoop as a root user

To resolve this navigate to /usr/hdf/3.1.1.0-35/hadoop/etc/hadoop

open hadoop-env.sh file

Add the below lines

export HDFS_NAMENODE_USER="root"

export HDFS_DATANODE_USER="root"

export HDFS_SECONDARYNAMENODE_USER="root"

export YARN_RESOURCEMANAGER_USER="root"

export YARN_NODEMANAGER_USER="root"

Start hadoop now

How to skip prerequisite check while installing oracle softwares on linux operating system

Installing obiee software on linux throwing prerequisite check failed error

To install the software by ignoring the prerequisite check , issue the command as below

Running 32 bit software on Linux 64 bit operating system

Try to Run the 32 bit software on 64 bit operating systemWe will get below waring and resolution for it

Setting 32 bit emulation mode



Running the 32 bit software again

Installing NIFI

Downloading the software

Extracting the software

Configuring Nifi

Open nifi.properties for updating configurations

Save and close the file

Starting the Nifi server

Connect to Nifi data flow management url in your browser: http://localhost:8090/nifi/

Disable Archive Log Mode in Oracle Database

Connect to the database

Checking for the database log mode and its status

To disable the archive log mode shutdown the database first

Now start the database in mount

Now alter the database to non archive log mode






Now open the database






Check for the database log mode and its status now

java.lang.OutOfMemoryError: Java heap space, Running OOM killer script for process 11420 for Solr on port 8983, hortonworks

In Hortonworks cluster environment Ambari Infra Solr service failed to start with below error:

# java.lang.OutOfMemoryError: Java heap space

# -XX:OnOutOfMemoryError="/usr/lib/ambari-infra-solr/bin/oom_solr.sh 8983 /var/log/ambari-infra-solr"

#   Executing /bin/sh -c "/usr/lib/ambari-infra-solr/bin/oom_solr.sh 8983 /var/log/ambari-infra-solr"...

Running OOM killer script for process 11420 for Solr on port 8983

Killed process 11420

Resolution:

To resolve this

1. Login to Ambari management console.
2. Goto Ambari Infra
3. Click on Configs
4. Under settings tab increase the Infra Solr Minimum and Maximum heap size and click on save.
5. Start the service now.