Dear Sasha : Thanks a lot for this information. Regards, Jeff ...
Dear Sasha :
Thanks a lot for this information.
I wonder what is the correct procedure to shut down clusters(HMC,Name Node, Data Node),then power on clusters ?
My Hadoop clusters are composed of 5 nodes, 1 name node(with HMC), 4 data nodes.
I once shut down 1 name node(with HMC), then powered up name node(with HMC),
after that, I never had a chance to let my cluster work again.
The error message required me to uninstall clusers, but the procedure to uninstall clusters never succeeded. so I had to remove HMC , then reinstall HMC to deploy clusters again.
But it's all the same,the condition never improved. Deploy clusters will definitely fail at install HDFS stage or somewhere again.
After the cluster deployment failure, I was required to uninstall clusters again.
However,as you can expect, the procedure to uninstall clusters will fail, and never succeed.
So I have to remove HMC ,then reinstall HMC , start HMC to deploy clusters.
eventually, this deployment will fail again at HDFS installation stage.
My questions are
1. What is the correct procedure to shut down clusters,then power on them ?
my Hadoop clusters consists of 5 nodes, 1 name node(with HMC), 4 data nodes.
If I need to power down these 5 nodes PM 9:00 every night, then power up them at
AM 9:00 tomorrow morning,
2.Why the uninstall clusters procedure can not be completed when there is some trouble on deploy clusters procedure? Anything wrong with the uninstall procedures or deploy cluster steps ?
It's a nightmare to uninstall clusters then deploy clusters ,
It's an endless loop. and the only way to break this failure loop is by formatting Hard drive,
re-insall CentOS linux environment, then set up HMC, finally to deploy clusters successfully.