/*! @m_page{{c,java},rebalance,Rebalance}

The WT_SESSION::rebalance method can be used to rebalance data sources'
underlying btrees. If a tree has become unbalanced (that is, one part of
the tree is excessively deep), WT_SESSION::rebalance rewrites the tree
as a balanced tree.

The data source must be quiescent.

The WT_SESSION::rebalance method should never be needed, as WiredTiger
btrees are maintained as balanced trees. It is only provided as a tool
to handle the unexpected.

 */