GitHub user dhalperi opened a pull request:
https://github.com/apache/beam/pull/2471
[BEAM-1907] PubsubIO: remove support for BoundedReader
Google Cloud Pub/Sub is not currently that useful in bounded mode --
it's a streaming source. Years ago, before the DirectRunner supported
unbounded PCollections and sources, however, we were unable to run the
streaming source in any SDK -- so we added a trivial bounded mode for
testing.
That trivial mode is no longer necessary. Additionally, it may confuse
users into thinking it's reliable (it's not), performant (it's not),
or has well defined semantics (it doesn't) -- it's really intended just
for testing.
Now that the DirectRunner supports everything we need -- unbounded
PCollections, non-blocking execution with cancelation, etc. -- we can
delete the bounded mode.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dhalperi/beam delete-pubsub-bounded
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/beam/pull/2471.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2471
----
commit 8f85169b8a19538fb3f59ad992c224dbc9a1e13e
Author: Dan Halperin <[email protected]>
Date: 2017-04-07T21:50:42Z
PubsubIO: remove support for BoundedReader
Google Cloud Pub/Sub is not currently that useful in bounded mode --
it's a streaming source. Years ago, before the DirectRunner supported
unbounded PCollections and sources, however, we were unable to run the
streaming source in any SDK -- so we added a trivial bounded mode for
testing.
That trivial mode is no longer necessary. Additionally, it may confuse
users into thinking it's reliable (it's not), performant (it's not),
or has well defined semantics (it doesn't) -- it's really intended just
for testing.
Now that the DirectRunner supports everything we need -- unbounded
PCollections, non-blocking execution with cancelation, etc. -- we can
delete the bounded mode.
----
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