Getting an intermittent test failure with this so removing it for now since compactions
are still able to keep up without it. Will need to look into this further because the
allocations is still very high and will affect compactions over longer periods of time.
MergeIterator will be used to merge multiple TSM KeyIterators and the
WAL KeyIterator using a stream based iteration approach. Each iteration
cycle returns a key and values ordered in way to write a new TSM file
optimally.
This provides and interface and type to combine multiple WAL segments
in order and then allow the values to be read in an order suitable for
writing to a TSM file.
Philip O'Toole
Jason Wilder