nastra commented on code in PR #16363:
URL: https://github.com/apache/iceberg/pull/16363#discussion_r3450625553
##########
core/src/main/java/org/apache/iceberg/TableProperties.java:
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@@ -180,6 +180,16 @@ private TableProperties() {}
"write.parquet.bloom-filter-max-bytes";
public static final int PARQUET_BLOOM_FILTER_MAX_BYTES_DEFAULT = 1024 * 1024;
+ // Enables parquet-mr's adaptive bloom filter sizing (PARQUET-2326). When
true,
+ // the writer evaluates ~5 candidate bloom filters and picks the smallest
that
+ // satisfies actual NDV at FPP, instead of always allocating
+ // `bloom-filter-max-bytes`. Significantly reduces file size for
low-row-count
+ // writes (e.g., streaming microbatches) that would otherwise pad the parquet
+ // file with an empty `bloom-filter-max-bytes` buffer.
Review Comment:
please also update `configuration.md`
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