Kenneth Knowles created BEAM-3746:
-------------------------------------
Summary: Count.globally should override
getIncompatibleGlobalWindowErrorMessage to tell the user the usage that is
currently only in javadoc
Key: BEAM-3746
URL: https://issues.apache.org/jira/browse/BEAM-3746
Project: Beam
Issue Type: Bug
Components: sdk-java-core
Reporter: Kenneth Knowles
https://beam.apache.org/documentation/sdks/javadoc/2.3.0/org/apache/beam/sdk/transforms/Count.html#globally--
"Note: if the input collection uses a windowing strategy other than
GlobalWindows, use Combine.globally(Count.<T>combineFn()).withoutDefaults()
instead."
But the actual crash a user gets is:
"java.lang.IllegalStateException: Default values are not supported in
Combine.globally() if the output PCollection is not windowed by GlobalWindows.
Instead, use Combine.globally().withoutDefaults() to output an empty
PCollection if the input PCollection is empty, or
Combine.globally().asSingletonView() to get the default output of the CombineFn
if the input PCollection is empty."
There is a method that exists solely to make this actually useful, so we should
use it!
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
