hbase的list_namespace的问题！！！求大神指导

hbase执行list-namespace是只显示NAMESPACE别的没有是为什么？
hbase(main):005:0> list_namespace
NAMESPACE

ERROR: Call id=27, waitTime=60002, operationTimeout=60000 expired.

Here is some help for this command:
List all namespaces in hbase. Optional regular expression parameter could
be used to filter the output. Examples:

hbase> list_namespace
hbase> list_namespace 'abc.*'

http://blog.csdn.net/cnhk1225/article/details/52346643