the version we use is hbase 0.98.10
i have some doubt on HConnectionImplementation and HTable
1. we can get a HConnectionImplementation using HConnectionManager using
'createConnection' method, and we can set the parameter 'managed' to true
such as the method in class HConnectionManager, line 433
but if we use this HConnectionImplementation to getTable, an exception
will be thrown, because 'managed' is true, this exception is thrown in class
HConnectionImplementation , line 809
2. when create htable using HConnectionImplementation, we can using the
specified pool as the pool htable will use, when we close a htable, the pool
will be shutdown only if 'cleanupPoolOnClose' is true, but htable get from
HConnectionImplementation will use constructor in class HTable, line 328.
cleanupPoolOnClose = false
so, when we close htable instance, the pool will be kept un-closed
