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To mitigate this, we will automatically force a Task commit if the total uncommitted records returned by StateStore#approximateNumUncommittedEntries()  exceeds a threshold, configured by statestore.uncommitted.max.records; or the total memory used for buffering uncommitted records returned by StateStore#approximateNumUncommittedBytes() exceeds the threshold configured by statestore.uncommitted.max.bytes. This will roughly bound the memory required per-Thread for buffering uncommitted records, irrespective of the commit.interval.ms, and will effectively bound the number of records that will need to be restored in the event of a failure. Each StreamThread will be given 1/num.stream.threads of the configured limits, dividing it fairly between them.

It's possible that some Topologies can generate many more new StateStore entries than the records they process, in which case, it would be possible for such a Topology to cross the configured record/memory thresholds mid-processing, potentially causing an OOM error if these thresholds are exceeded by a lot. To mitigate this, the StreamThread will measure the increase in records/bytes written on each iteration, and pre-emptively commit if the next iteration is likely to cross a threshold.

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