Apache Kudu background maintenance tasks
Kudu relies on running background tasks for many important maintenance activities.
These tasks include flushing data from memory to disk, compacting data to improve performance,
freeing up disk space, and more.
Maintenance manager Flushing data to disk MemRowSet, to a read-optimized, column-oriented format on disk.Compacting on-disk data Write-ahead log garbage collection --log_segment_size_mb property).Tablet history garbage collection and the ancient history mark 