hililiwei commented on PR #7638:
URL: https://github.com/apache/iceberg/pull/7638#issuecomment-1554321996

   >Can you also explain what does "partition commit" mean exactly?
   
   Partition commit means that in the current task, we consider that the data 
of a partition is ready and can be opened to downstream applications. Here we 
can define what actions to perform when committing partitions. Is it to submit 
the partition  to the metadata, create a marker file, or perform some other 
custom operations.
   
   For example, there is a table partitioned by hour, when the watermark based 
on event time reaches 02:00:00 we think that the data of the `01` hour 
partition is complete and can be used by downstream applications, so we write 
this partition to the metadata. In this case, we can make a remote API call to 
notify a task flow that it can proceed to the spark batch step for  `01` hour 
partition.
   
   


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