Thanks , i figured out the issue. i was passing the credentials but as it was a new service id , i had not added it with our hadoop group. so the credential also couldnot be logged in to cloudera manager (which i hadnt checked earlier ,as it was working fine while logging into the server ) ... View more

Hwat you mean "sleep for seconds"   ... View more

I'm not sure there are risks specifically. The best practice is to use Cloudera manager to configure memory limits for different services, so this is the right way to configure things.   Cloudera Manager does have support to help set up memory limits for applications: https://www.cloudera.com/documentation/enterprise/latest/topics/cm_mc_autoconfig.html#concept_xjy_vb3_rn .    For a production system, it's important to put thought into how much memory your system needs and how it's allocated between different services.  E.g. as an earlier poster saw, 256MB is not enough memory to do much interesting with Impala.     ... View more

https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html I recommend opening a new topic you have any other questions on storage pools. That way this discussion can stay on topic. ... View more