tonytanger opened a new pull request, #25153:
URL: https://github.com/apache/beam/pull/25153
Adding the skeleton of the change stream pipeline of Google Cloud Bigtable.
The logic is similar to that of Cloud Spanner's change stream connector.
Pipeline contains 3 steps
* InitializeDoFn - Responsible to validating preconditions such as creating
metadata table, ensuring options are valid and correct, and determine a valid
start time for the pipeline.
* DetectNewPartitionsDoFn - Manages the lifecycles of partitions being
streamed. This includes initially outputting the initial list of partitions to
be streamed, and as partitions split and merge, create new partitions to be
streamed. DetectNewPartitions is also responsible to ensure all partitions are
streamed and non are missing and keep track of the watermark of the entire
pipeline.
* ReadChangeStreamPartitionDoFn - Streams individual partitions and output
data changes. It also handles termination, whether that's the end of the
pipeline termination, or the partition has split or merged so it no longer
exists.
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