* Update cache to have a single slice of values for a key (removed checkpoints)
* Changed compact.Plan to only worry about TSM files.
* Updated Plan to not return an error since there was no case in which it would.
* Update WAL to not keep stats since they're no longer needed.
* Update engine to flush the Cache/WAL to a new TSM file when the min threshold is hit.
* Split compact logic between TSM compacts and WAL/Cache writes.
* Remove unnecessary merge iterator, wal segment iterator, and other no longer necessary stuff.
* Remove the asending bool from the Dedupe method. Values should always be in ascending order. It's up to the cursor to iterate through values based on the direction. Giving the cursor responsibility makes it so we don't need to sort, dedupe or reallocate anything for different query orders.
* Updated engine to use its locks to ensure writes and cache flushes don't cause a race.
* Update all tests with new signatures. Removed a bunch of tests around TSM rewrites and WAL segment iteration that are no longer necessary.
100mb is easy it hit even with basic stress test config. Don't set
a limit by default so that an operator can size it appropriately based
on their hardware.
Starting to integrate some of the components into a engine that is
usable for development purposes. This allows the code to evolve while
keeping the existing TSM engine in tact for reference.
Currently, just the WAL is wired up so writes can be tested. Other engine
functions will panic the server if called.
Jason Wilder
Paul Dix
Philip O'Toole