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The following commit(s) were added to refs/heads/main by this push:
new 7c2d4c3a docs: Clarify functionality of `SnapshotProduceOperation`
(#1874)
7c2d4c3a is described below
commit 7c2d4c3abd6c5496c7ecb76854b6ee0d7295369c
Author: Jonathan Chen <[email protected]>
AuthorDate: Tue Nov 25 20:32:33 2025 -0500
docs: Clarify functionality of `SnapshotProduceOperation` (#1874)
## Which issue does this PR close?
- Closes #.
## What changes are included in this PR?
While refreshing myself on the internals of iceberg-rust, I felt that
`SnapshotproduceOperation` should have documentation to be more clear to
anybody who wants to work on Iceberg-rust
## Use of LLM Clarification
I did use LLM to generate these docs however I reviewed it myself.
---
crates/iceberg/src/transaction/snapshot.rs | 40 ++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/crates/iceberg/src/transaction/snapshot.rs
b/crates/iceberg/src/transaction/snapshot.rs
index 6b3d0e4f..d59828ce 100644
--- a/crates/iceberg/src/transaction/snapshot.rs
+++ b/crates/iceberg/src/transaction/snapshot.rs
@@ -34,13 +34,53 @@ use crate::{Error, ErrorKind, TableRequirement,
TableUpdate};
const META_ROOT_PATH: &str = "metadata";
+/// A trait that defines how different table operations produce new snapshots.
+///
+/// `SnapshotProduceOperation` is used by [`SnapshotProducer`] to customize
snapshot creation
+/// based on the type of operation being performed (e.g., `Append`,
`Overwrite`, `Delete`, etc.).
+/// Each operation type implements this trait to specify:
+/// - Which operation type to record in the snapshot summary
+/// - Which existing manifest files should be included in the new snapshot
+/// - Which manifest entries should be marked as deleted
+///
+/// # When it accomplishes
+///
+/// This trait is used during the snapshot creation process in
[`SnapshotProducer::commit()`]:
+///
+/// 1. **Operation Type Recording**: The `operation()` method determines which
operation type
+/// (e.g., `Operation::Append`, `Operation::Overwrite`) is recorded in the
snapshot summary.
+/// This metadata helps track what kind of change was made to the table.
+///
+/// 2. **Manifest File Selection**: The `existing_manifest()` method
determines which existing
+/// manifest files from the current snapshot should be carried forward to
the new snapshot.
+/// For example:
+/// - An `Append` operation typically includes all existing manifests plus
new ones
+/// - An `Overwrite` operation might exclude manifests for partitions being
overwritten
+///
+/// 3. **Delete Entry Processing**: The `delete_entries()` method is intended
for future delete
+/// operations to specify which manifest entries should be marked as
deleted.
pub(crate) trait SnapshotProduceOperation: Send + Sync {
+ /// Returns the operation type that will be recorded in the snapshot
summary.
+ ///
+ /// This determines what kind of operation is being performed (e.g.,
`Append`, `Overwrite`),
+ /// which is stored in the snapshot metadata for tracking and auditing
purposes.
fn operation(&self) -> Operation;
+
+ /// Returns manifest entries that should be marked as deleted in the new
snapshot.
#[allow(unused)]
fn delete_entries(
&self,
snapshot_produce: &SnapshotProducer,
) -> impl Future<Output = Result<Vec<ManifestEntry>>> + Send;
+
+ /// Returns existing manifest files that should be included in the new
snapshot.
+ ///
+ /// This method determines which manifest files from the current snapshot
should be
+ /// carried forward to the new snapshot. The selection depends on the
operation type:
+ ///
+ /// - **Append operations**: Typically include all existing manifests
+ /// - **Overwrite operations**: May exclude manifests for partitions being
overwritten
+ /// - **Delete operations**: May exclude manifests for partitions being
deleted
fn existing_manifest(
&self,
snapshot_produce: &SnapshotProducer<'_>,
