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Spark: Document broadcast size-map scaling in rewrite table action #17023

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Spark: Document broadcast size-map scaling in rewrite table action #17023

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3 changes: 3 additions & 0 deletions ...3.5/spark/src/main/java/org/apache/iceberg/spark/actions/RewriteTablePathSparkAction.java
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Original file line number Diff line number Diff line change
Expand Up @@ -327,6 +327,9 @@ private Result rebuildMetadata() {
Map<String, Long> rewrittenDeleteFileSizes = rewritePositionDeletes(deleteFilesToRewrite);

// rebuild manifest files
// The size map holds one entry per distinct rewritten delete-file location. It is collected to
// the driver and broadcast to the manifest-rewrite tasks, so its footprint scales with the
// number of distinct delete files being rewritten rather than the table's total file count.
RewriteContentFileResult rewriteManifestResult =
rewriteManifests(
deltaSnapshots,
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3 changes: 3 additions & 0 deletions ...4.0/spark/src/main/java/org/apache/iceberg/spark/actions/RewriteTablePathSparkAction.java
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Original file line number Diff line number Diff line change
Expand Up @@ -327,6 +327,9 @@ private Result rebuildMetadata() {
Map<String, Long> rewrittenDeleteFileSizes = rewritePositionDeletes(deleteFilesToRewrite);

// rebuild manifest files
// The size map holds one entry per distinct rewritten delete-file location. It is collected to
// the driver and broadcast to the manifest-rewrite tasks, so its footprint scales with the
// number of distinct delete files being rewritten rather than the table's total file count.
RewriteContentFileResult rewriteManifestResult =
rewriteManifests(
deltaSnapshots,
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3 changes: 3 additions & 0 deletions ...4.1/spark/src/main/java/org/apache/iceberg/spark/actions/RewriteTablePathSparkAction.java
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Original file line number Diff line number Diff line change
Expand Up @@ -327,6 +327,9 @@ private Result rebuildMetadata() {
Map<String, Long> rewrittenDeleteFileSizes = rewritePositionDeletes(deleteFilesToRewrite);

// rebuild manifest files
// The size map holds one entry per distinct rewritten delete-file location. It is collected to
// the driver and broadcast to the manifest-rewrite tasks, so its footprint scales with the
// number of distinct delete files being rewritten rather than the table's total file count.
RewriteContentFileResult rewriteManifestResult =
rewriteManifests(
deltaSnapshots,
Expand Down