aokolnychyi commented on code in PR #6002:
URL: https://github.com/apache/iceberg/pull/6002#discussion_r1006164387
##########
core/src/main/java/org/apache/iceberg/ManifestEntry.java:
##########
@@ -118,6 +124,27 @@ default boolean isLive() {
@Deprecated
void setSequenceNumber(long sequenceNumber);
+ /**
+ * Returns the file sequence number.
+ *
+ * <p>The file sequence number represents the sequence number of the
snapshot in which the
+ * underlying file was added. The file sequence number is always assigned at
commit and cannot be
+ * provided explicitly, unlike the data sequence number. The file sequence
number does not change
+ * upon assigning and must be preserved in existing and deleted entries.
+ *
+ * <p>This method can return null if the file sequence number is unknown.
This may happen while
+ * reading a v2 manifest that did not persist the file sequence number for
manifest entries with
+ * status EXISTING or DELETED (older Iceberg versions).
+ */
+ Long fileSequenceNumber();
Review Comment:
@flyrain, this is something controlled by the following option in the
compaction action.
```
/**
* If the compaction should use the sequence number of the snapshot at
compaction start time for
* new data files, instead of using the sequence number of the newly
produced snapshot.
*
* <p>This avoids commit conflicts with updates that add newer equality
deletes at a higher
* sequence number.
*
* <p>Defaults to true.
*/
String USE_STARTING_SEQUENCE_NUMBER = "use-starting-sequence-number";
```
By default, df3 will use the sequence number of the snapshot at which the
compaction started.
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