I have the same problem when I study https://nightlies.apache.org/flink/flink-docs-release-1.14/zh/docs/try-flink/table_api/. When I use tumble window, I got nothing in MySQL sink.
return transactions
.window(Tumble.over(lit(1).hour()).on($("transaction_time")).as("log_ts"))
.groupBy($("account_id"), $("log_ts"))
.select(
$("account_id"),
$("log_ts").start().as("log_ts"),
$("amount").sum().as("amount"));
When I use the default 8 parallelism, I found some subtask didn't receive records from upstream in the web front-end.
But when I add tEnv.getConfig().addConfiguration(new Configuration().set(CoreOptions.DEFAULT_PARALLELISM, 1)); in the main function, I got results in the MySQL sink, and the web front-end was like below:
Can anybody tell me why?
