rdblue commented on a change in pull request #675: Inherit snapshot ids for
manifest entries
URL: https://github.com/apache/incubator-iceberg/pull/675#discussion_r364357342
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File path: core/src/main/java/org/apache/iceberg/FastAppend.java
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@@ -81,15 +83,21 @@ public FastAppend appendFile(DataFile file) {
@Override
public FastAppend appendManifest(ManifestFile manifest) {
- // the manifest must be rewritten with this update's snapshot ID
- try (ManifestReader reader = ManifestReader.read(
- ops.io().newInputFile(manifest.path()), ops.current().specsById())) {
- OutputFile newManifestPath =
manifestPath(manifestCount.getAndIncrement());
- appendManifests.add(ManifestWriter.copyAppendManifest(reader,
newManifestPath, snapshotId(), summaryBuilder));
+ Preconditions.checkArgument(!manifest.hasExistingFiles(), "Cannot append
manifest with existing files");
+ Preconditions.checkArgument(!manifest.hasDeletedFiles(), "Cannot append
manifest with deleted files");
+ Preconditions.checkArgument(manifest.snapshotId() == null, "Snapshot id
must be assigned during commit");
+
+ // TODO: avoid reading manifests to simply get stats
+ try (ManifestReader reader = ManifestReader.read(manifest, ops.io(),
ops.current().specsById())) {
Review comment:
Ideally, we would produce all of the summary stats, but the most important
ones are `total-data-files`, `total-records`, and the `added-` or `deleted-`
properties that are used to produce totals. I think it's okay to not write the
`changed-partition-count` metrics if they require scanning the appended
manifest.
I think my response was confusing because we keep additional summary
information about each partition in our version. I can move that upstream if
everyone wants it, but it can make the metadata files quite large. Without a
use case for doing this upstream, I didn't think it was a good idea to make
everyone's metadata significantly larger.
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