AI / Apache Paimon Interview questions
What is Paimon's LSM tree used for?
Paimon adopts the LSM tree (Log-Structured Merge-tree) as the on-disk data structure inside every bucket, which is what makes high-throughput streaming updates into a data lake practical in the first place. New records are first buffered in memory; when the buffer fills, they're sorted and flushed to disk as a new sorted run.
This write pattern — buffer, sort, flush — avoids the random-write cost of updating existing files in place, which is normally the hard part of doing upserts against object storage. The tradeoff is that reads have to merge across potentially several sorted runs, which is what compaction exists to keep in check.
Paimon's LSM tree lives inside:
The LSM write pattern of buffering, sorting, and flushing mainly avoids:
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