garyli1019 commented on issue #1362: HUDI-644 Enable user to get checkpoint from previous commits in DeltaStreamer URL: https://github.com/apache/incubator-hudi/pull/1362#issuecomment-593579929 @pratyakshsharma Thanks for reviewing this PR. I can say more about my use cases: - I am using Kafka connect to sink Kafka to HDFS every 30 minutes, partitioned by the arrival time(year=xx/month=xx/day=xx/hour=xx) - The homebrew spark Datasource I built is using (the current time - the last Hudi commit timestamp) to find a `timeWindow` and use it to load the data generated by Kafka connect. - I will be easy to switch to delta streamer with DFS source, but a little bit tricky to switch to Kafka, because there is a delay caused by the Kafka connect. So right now, if I switch to delta streamer directly ingesting from Kafka, I will start from the `LATEST` checkpoint, and `EARLIEST` is not possible because my Kafka cluster retention time is pretty long. The data loss I mentioned in the few hours gap between the commit I switched from my homebrew Spark data source reader to delta streamer. All I need to do is in this commit, I run the delta streamer first to store the `LATEST` checkpoint, then run my data source reader to read the data in those few hours gap. Only need one parallel run here then I will be good to go with the delta streamer.
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