damccorm opened a new issue, #21329:
URL: https://github.com/apache/beam/issues/21329
Currently, by default, a "Write" transform is considered as a final
`PTransform` in a pipeline and it returns `PDone` that can't be used later for
next pipeline stages.
Though, sometimes it's needed to use the results of write operation as input
`PCollection` downstream of pipeline and some IOs already support this. For
example, `JdbcIO.Write` has the methods `withResults()` and
`withWriteResults()` that returns a `PTransform` with output `PCollection<>` of
write results and it can be used to analyse the results or, along with `Wait`
transform, to write into the second database only if writes into the first one
were finished, like this:
```
PCollection<Void> firstWriteResults = data.apply(JdbcIO.write()
.withDataSourceConfiguration(CONF_DB_1).withResults());
data.apply(Wait.on(firstWriteResults))
.apply(JdbcIO.write().withDataSourceConfiguration(CONF_DB_2));
```
So, it would be useful to add a `WriteWithResults` transform for other IOs
that can be used in the same way.
Imported from Jira
[BEAM-13584](https://issues.apache.org/jira/browse/BEAM-13584). Original Jira
may contain additional context.
Reported by: aromanenko.
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