Nice! On Wed, Feb 7, 2018 at 6:45 PM, Charles Chen <c...@google.com> wrote:
> The existing DirectRunner will be needed for the foreseeable future since > it is currently the only local runner that supports streaming execution. > > On Wed, Feb 7, 2018, 6:39 PM Pablo Estrada <pabl...@google.com> wrote: > >> Very cool Charles! Have you considered whether you'll want to remove the >> direct runner code afterwards? >> Best >> -P. >> >> On Wed, Feb 7, 2018, 6:25 PM Lukasz Cwik <lc...@google.com> wrote: >> >>> That is pretty awesome. >>> >>> On Wed, Feb 7, 2018 at 5:55 PM, Charles Chen <c...@google.com> wrote: >>> >>>> Local execution of Beam pipelines on the Python DirectRunner currently >>>> suffers from performance issues, which makes it hard for pipeline authors >>>> to iterate, especially on medium to large size datasets. We would like to >>>> optimize and make this a better experience for Beam users. >>>> >>>> The FnApiRunner was written as a way of leveraging the portability >>>> framework execution code path for local portability development. We've >>>> found it also provides great speedups in batch execution with no user >>>> changes required, so we propose to switch to use this runner by default in >>>> batch pipelines. For example, WordCount on the Shakespeare dataset with a >>>> single CPU core now takes 50 seconds to run, compared to 12 minutes before; >>>> this is a 15x performance improvement that users can get for free, >>>> with no user pipeline changes. >>>> >>>> The JIRA for this change is here (https://issues.apache.org/ >>>> jira/browse/BEAM-3644), and a candidate patch is available here ( >>>> https://github.com/apache/beam/pull/4634). I have been working over >>>> the last month on making this an automatic drop-in replacement for the >>>> current DirectRunner when applicable. Before it becomes the default, you >>>> can try this runner now by manually specifying apache_beam.runners. >>>> portability.fn_api_runner.FnApiRunner as the runner. >>>> >>>> Even with this change, local Python pipeline execution can only >>>> effectively use one core because of the Python GIL. A natural next step to >>>> further improve performance will be to refactor the FnApiRunner to allow >>>> for multi-process execution. This is being tracked here ( >>>> https://issues.apache.org/jira/browse/BEAM-3645). >>>> >>>> Best, >>>> >>>> Charles >>>> >>> >>> >> >> -- >> Got feedback? go/pabloem-feedback >> <https://goto.google.com/pabloem-feedback> >> >
