@Arul kumar
Can you please share the logs from your Region Server when it got killed/stopped suddenly so that we can track the events to understand what happened?
Also please check the "/var/log/messages" file, matching the timestamp when your Region Server got killed/stopped.
When you start running your sqoop job that time did you notice the following outputs?
# free -m
# top
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To verify if your OS was having enough resources when you started the sqoop job?
This is important because sometimes due to resource unavailability the OS kills some resources.
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Example: (just example)The "/proc/sys/vm/overcommit_memory" settings on the OS can allow OS to kill the applications that are consuming much memory.
See: http://engineering.pivotal.io/post/Virtual_memory_settings_in_Linux_-_The_problem_with_Overcommit/
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