Yes. On Wed, Feb 11, 2015 at 5:44 PM, Todd Gao <todd.gao.2013+sp...@gmail.com> wrote: > Thanks Davies. > I am not quite familiar with Spark Streaming. Do you mean that the compute > routine of DStream is only invoked in the driver node, > while only the compute routines of RDD are distributed to the slaves? > > On Thu, Feb 12, 2015 at 2:38 AM, Davies Liu <dav...@databricks.com> wrote: >> >> The CallbackServer is part of Py4j, it's only used in driver, not used >> in slaves or workers. >> >> On Wed, Feb 11, 2015 at 12:32 AM, Todd Gao >> <todd.gao.2013+sp...@gmail.com> wrote: >> > Hi all, >> > >> > I am reading the code of PySpark and its Streaming module. >> > >> > In PySpark Streaming, when the `compute` method of the instance of >> > PythonTransformedDStream is invoked, a connection to the CallbackServer >> > is created internally. >> > I wonder where is the CallbackServer for each PythonTransformedDStream >> > instance on the slave nodes in distributed environment. >> > Is there a CallbackServer running on every slave node? >> > >> > thanks >> > Todd > >
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