Hello all,
I'm running following command in Hbase shell:

create "sample","cf"

and getting following error 

ERROR: org.apache.hadoop.hbase.ZooKeeperConnectionException: HBase is able to connect to ZooKeeper but the connection closes immediately. This could be a sign that the server has too many connections (30 is the default). Consider inspecting your ZK server logs for that error and then make sure you are reusing HBaseConfiguration as often as you can. See HTable's javadoc for more information.

please provide me solution for the same

Assistant Professor,
U & P U Patel Department of Computer Engineering,
Chandubhai S. Patel Institute of Technology,
Charotar University of Science And Technology (CHARUSAT),
Changa-388421, Gujarat, INDIA.
Personal Website: https://sites.google.com/a/ecchanga.ac.in/chintan/

DISCLAIMER: The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material which is the intellectual property of Charotar University of Science & Technology (CHARUSAT). Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon this information by persons or entities other than the intended recipient is strictly prohibited. If you are not the intended recipient, or the employee, or agent responsible for delivering the message to the intended recipient and/or if you have received this in error, please contact the sender and delete the material from the computer or device. CHARUSAT does not take any liability or responsibility for any malicious codes/software and/or viruses/Trojan horses that may have been picked up during the transmission of this message. By opening and solely relying on the contents or part thereof this message, and taking action thereof, the recipient relieves the CHARUSAT of all the liabilities including any damages done to the recipient's pc/laptop/peripherals and other communication devices due to any reason.