Introduces new `pilosactl sort` to sort import files by bit
position so they can be inserted faster. Also optimizes container
scanning and adds a `-buffer-size` flag to `import`.
This commit makes several changes to optimize the TopN() query:
- Reduce highbits() back from 24-bits to 16-bits.
- Reduce MaxArraySize back from 2^20 to 4096.
- Optimize bitmap count invalidation.
- Parallelize TopN() across nodes.
- Parallelize TopN() across slices.
Reworks the `roaring.intersectionCountArrayBitmap()` call to avoid
using an iterator. Performance of the included benchmark went from
2.5ms to 1.1ms.
Some of the issue with intersectionCount is the increased size of
bitmaps and slices and I need to do additional testing with various
sizes.
CSV exports can now be done with the pilosactl application:
$ pilosactl -d mydb -f myframe -o MYFILE.csv
If `-o` is not specified then the CSV is written to STDOUT. The
exporter combines all slices for the db/frame to into a single
concatenated CSV file.
This commit adds `roaring.Bitmap.CountRange()` to return the number
of bits in a subrange of a bitmap. This significantly improves
server start time and is needed for upcoming zero copy bitmap
optimizations.
This commit moves the cache flush to the `Index` and only serializes
a single fragment at a time.
Also included in this commit is the `inspect` command for the
`pilsoactl` binary. This provides insight into pilosa data files.
This commit refactors the block checksumming by removing the
iteration over each block and instead only checking blocks which
have data. This requires merging the cache inspection with the
roaring iterator to reduce CPU time and memory allocations.
This commit adds a `Closing` channel to the `IndexSyncer` and the
`FragmentSyncer` that is periodically checked during execution.
If the channel is closed then an in-progress sync is immediately
stopped.
