Decommissioning is process to remove one or multiple datanodes from Hadoop.
To decommission a datanode you need to use following process:
Login to namenode host.
Add follwoing configuration in/home/guest/hadoop-2.5.1/etc/hadoop/hdfs-site.xml
After adding dfs.hosts.exclude property you need to restart HDFS.
isl-0.15 is required to build GCC with the Graphite loop optimizations. You can download the isl-0.15 from ftp://gcc.gnu.org/pub/gcc/infrastructure/
# bunzip2 isl-015.tar.bz2
# tar -xvf isl-0.15
# ./configure --prefix=/usr/local/isl-0.15 --with-gmp-prefix=/usr/local/gmp-4.3.2
# make && make install
To perform syntax check and dry run for ansible playbook use following command:
ansible-playbook -i hosts_file --syntax-check --list-tasks playbook.yml
where, –syntax-check is used to check syntax of a playbook & –list-tasks is to all tasks that are executed.
DBMS_OUTPUT package is the standard way to "print"
output from PL/SQL. The way
DBMS_OUTPUT works is like a
buffer. Your Node.js application code turns on
DBMS_OUTPUT buffering, calls some PL/SQL code that puts
text into the buffer, and then later fetches from that buffer. Note:
any PL/SQL code that calls
DBMS_OUTPUT runs to completion
before any output is available to the user. Also, other database
connections cannot access your buffer.
Last Friday I got pulled in to a very hot customer call.
The issue was best summarised as
Since migrating our WebLogic and database services from AIX to Solaris, at random times we are seeing the the WebLogic server pause for a few minutes at a time. This takes down the back office and client services part of the business for these periods and is causing increasing frustration on the part of staff and customers. This only occurs when a particular module is enabled in WebLogic.