make Flink iceberg sink work without checkpoint enabled.
Current Flink Iceberg Sink depends on checkpoint to do commit. If we don't enable checkpoint, the data will not be commit into iceberg. so we have to do an improvement.
relate to PR: [https://github.com/apache/iceberg/pull/1515]
Hi @simonsssu , can you explain more about the user cases? Without checkpointing, it seems that consistency is not guaranteed at all. What are the disadvantages of opening checkpointing?
@JingsongLi In my use case, the input is a NATS stream which already supports durable and acknowledge mechanism, so I don't think I need checkpointing to guarantee consistency.
Also, opening checkpointing means another storage needed to store checkpoint files?
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