AI / Apache Paimon Interview questions
What is a Bucket in Paimon?
A bucket is the smallest storage unit Paimon reads and writes at — unpartitioned tables, or each partition within a partitioned table, are sub-divided into buckets to add extra structure for efficient querying. Each bucket directory holds its own LSM tree and changelog files.
Which bucket a record lands in is determined by the hash of one or more columns, configurable via the bucket-key option; if unset, the primary key (or the whole record for append tables) is used instead. Because the bucket count caps write parallelism, Paimon recommends keeping each bucket's data around 200MB–1GB — too many buckets creates lots of small files, too few limits throughput.
A Paimon bucket is:
If bucket-key is not set on a primary key table, Paimon uses:
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