For reference, on a 16 core machine, I was able to run the sequential version of streaming k-means on 1,000,000 points, each with 10 dimensions in about 20 seconds. The map-reduce versions are comparable subject to scaling except for startup time.
On Mon, Dec 23, 2013 at 1:41 PM, Sebastian Schelter <s...@apache.org> wrote: > That the algorithm runs a single reducer is expected. The algorithm > creates a sketch of the data in parallel in the map-phase, which is > collected by the reducer afterwards. The reducer then applies an > expensive in-memory clustering algorithm to the sketch. > > Which dataset are you using for testing? I can also do some tests on a > cluster here. > > I can imagine two possible causes for the problems: Maybe there's a > problem with the vectors and some calculations take very long because > the wrong access pattern or implementation is chosen. > > Another problem could be that the mappers and reducers have too few > memory and spend a lot of time running garbage collections. > > --sebastian > > > On 23.12.2013 22:14, Suneel Marthi wrote: > > Has anyone be successful running Streaming KMeans clustering on a large > dataset (> 100,000 points)? > > > > > > It just seems to take a very long time (> 4hrs) for the mappers to > finish on about 300K data points and the reduce phase has only a single > reducer running and throws an OOM failing the job several hours after the > job has been kicked off. > > > > Its the same story when trying to run in sequential mode. > > > > Looking at the code the bottleneck seems to be in > StreamingKMeans.clusterInternal(), without understanding the behaviour of > the algorithm I am not sure if the sequence of steps in there is correct. > > > > > > There are few calls that call themselves repeatedly over and over again > like SteamingKMeans.clusterInternal() and Searcher.searchFirst(). > > > > We really need to have this working on datasets that are larger than 20K > reuters datasets. > > > > I am trying to run this on 300K vectors with k= 100, km = 1261 and > FastProjectSearch. > > > >
