P.S Spark implementation is under Apache. On Sat, Oct 28, 2017 at 9:41 AM, Wail Alkowaileet <[email protected]> wrote:
> Android has an implementation: > https://github.com/retrostreams/android-retrostreams/blob/master/src/ > main/java/java9/util/TimSort.java > > Spark has ported it > https://github.com/apache/spark/blob/master/core/src/ > main/java/org/apache/spark/util/collection/TimSort.java > > We can customize it for AsterixDB comparators. > > On Sat, Oct 28, 2017 at 9:28 AM, Chen Luo <[email protected]> wrote: > >> I don't know whether there is an easy way for us to directly reuse TimSort >> in JDK since it's design for sorting objects in an Array, while in Hyracks >> we don't have explicit object creation and sort everything in main memory. >> So what I did is that I copied it's source code, and replaced all object >> assignments/swaps/comparisons using Hyracks in-memory operations. >> >> Best regards, >> Chen Luo >> >> On Sat, Oct 28, 2017 at 12:07 AM, 李文海 <[email protected]> wrote: >> >> > I believe reusing jdk afap could be better. btw, timsort is better than >> > others by 1x when records are locally ordered . >> > best >> > >> > 在 2017-10-28 14:38:21，"abdullah alamoudi" <[email protected]> 写道： >> > >> > >While I have no answer to the question of legality, this sounds great. >> > > >> > >~Abdullah. >> > > >> > >> On Oct 27, 2017, at 9:20 PM, Chen Luo <[email protected]> wrote: >> > >> >> > >> Hi devs, >> > >> >> > >> I have adapted the TimSort algorithm used in JDK (java.util.TimSort) >> > into >> > >> Hyracks, which gives 10-20% performance improvements on random data. >> It >> > >> will be more useful if the input data is partially sorted, e.g., >> primary >> > >> keys fetched from secondary index scan, which I haven't got time to >> > >> experiment with. >> > >> >> > >> *Before going any further, is it legal to adapt some algorithm >> > >> implementation from JDK into our codebase? *I saw the JDK >> implementation >> > >> itself is adopted from >> > >> http://svn.python.org/projects/python/trunk/Objects/listsort.txt as >> > well. >> > >> >> > >> Best regards, >> > >> Chen Luo >> > > >> > >> > >> > > > > -- > > *Regards,* > Wail Alkowaileet > -- *Regards,* Wail Alkowaileet
