[
https://issues.apache.org/jira/browse/BEAM-3061?focusedWorklogId=196971&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-196971
]
ASF GitHub Bot logged work on BEAM-3061:
----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Feb/19 15:23
Start Date: 11/Feb/19 15:23
Worklog Time Spent: 10m
Work Description: steveniemitz commented on pull request #7805:
[BEAM-3061] Done notifications for BigtableIO.Write
URL: https://github.com/apache/beam/pull/7805
This adds support for "done" notification in `BigtableIO.write()`. For each
bundle+window that is written, a single "Void" is output by the PTransform.
Doing so allows flows to effectively wait for all writes to finish.
A common use-case of this is to wait for all writes to finish, and then do
something else, this can be accomplished using the built-in `Wait.on` transform
with the output of the write, like so:
```
val writeResults = mutations.apply(
"WriteToBigtable",
BigtableIO.write()...
)
val collectionToProcessAfterWrites = Create.of("derp")
collectionToProcessAfterWrites
.apply(Wait.on(writeResults))
.apply(ParDo.of(someFn))
```
An important point to note here is this only ensures writes have been
applied **to a single cluster**, it does not ensure that all writes **have
replicated to all clusters**.
I had also made a previous PR a few months ago
(https://github.com/apache/beam/pull/3997), this is an enhancement of that.
TODO: unit tests (coming soon!)
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 196971)
Time Spent: 50m (was: 40m)
> BigtableIO should support emitting a sentinel "done" value when a bundle
> completes
> ----------------------------------------------------------------------------------
>
> Key: BEAM-3061
> URL: https://issues.apache.org/jira/browse/BEAM-3061
> Project: Beam
> Issue Type: Improvement
> Components: io-java-gcp
> Reporter: Steve Niemitz
> Assignee: Steve Niemitz
> Priority: Major
> Labels: triaged
> Time Spent: 50m
> Remaining Estimate: 0h
>
> There was some discussion of this on the dev@ mailing list [1]. This
> approach was taken based on discussion there.
> [1]
> https://lists.apache.org/thread.html/949b33782f722a9000c9bf9e37042739c6fd0927589b99752b78d7bd@%3Cdev.beam.apache.org%3E
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