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If you are on Ubuntu you will need to make the following changes:
In the file /etc/security/limits.conf add a line like:
hadoop - nofile 32768Replace
hadoop with whatever user is running Hadoop and HBase. If you have separate users, you will need 2 entries, one for each user. In the same file set nproc hard and soft limits. For example:
hadoop soft/hard nproc 32000
In the file /etc/pam.d/common-session or /etc/pam.d/login add as the last line in the file:
session required pam_limits.so
Otherwise the changes in /etc/security/limits.conf won't be applied.
Don't forget to log out and back in again for the changes to take effect!