Hi, Anil. Iceberg Sink is merged recently in https://github.com/apache/iceberg/pull/10179#pullrequestreview-2350414880.
From your description, I guess that what you need is a TwoPhaseCommittingSink[1], the steps you listed can be executed with the following steps: > 1. Group data by category and write it to S3 under its respective prefix. This can be done in org.apache.flink.api.connector.sink2.TwoPhaseCommittingSink$PrecommittingSinkWriter#write method. > 2. Update category metrics in a manifest file stored in the S3 manifest > prefix. > 3. Send category metrics to an external system to initiate consumption. These metrics information could be passed by org.apache.flink.api.connector.sink2.TwoPhaseCommittingSink$PrecommittingSinkWriter#prepareCommit method. And `Update category metrics`/`Send category metrics` can be done in org.apache.flink.api.connector.sink2.Committer#commit method. Rollback action could be done in SinkWriter or Committer, to delete files from S3, you need to pass the files information though PrecommittingSinkWriter#prepareCommit too. Then you can throw exception to let Flink job failover and retry. [1] https://nightlies.apache.org/flink/flink-docs-release-1.20/api/java/org/apache/flink/api/connector/sink2/TwoPhaseCommittingSink.html > 2024年10月14日 12:49，Anil Dasari <adas...@guidewire.com> 写道： > > Hello, > I am looking to implement a Flink sink for the following use case, where the > steps below are executed for each microbatch (using Spark terminology) or > trigger: > > Group data by category and write it to S3 under its respective prefix. > Update category metrics in a manifest file stored in the S3 manifest prefix. > Send category metrics to an external system to initiate consumption. > In case of failure, any previously completed steps should be rolled back, > i.e., delete files from S3 and reprocess the entire microbatch. > > It seems this pattern can be implemented using the Unified Sink API, as > discussed in this video: https://www.youtube.com/watch?v=0GVI25OEs4A. > > I'm currently reviewing FileSink and IcebergSink (still searching for the > source code) to understand their implementations and create a new one. > > Are there any step-by-step docs or examples available for writing a new > unified sink? > > Thanks > > >
