rdblue commented on a change in pull request #4380:
URL: https://github.com/apache/iceberg/pull/4380#discussion_r835983099
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File path: docs/spark/spark-configuration.md
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@@ -185,5 +185,5 @@ df.write
| snapshot-property._custom-key_ | null | Adds an entry with
custom-key and corresponding value in the snapshot summary |
| fanout-enabled | false | Overrides this table's
write.spark.fanout.enabled |
| check-ordering | true | Checks if input schema and table schema
are same |
-| isolation-level | null | Desired isolation level for Dataframe overwrite
operations. Null => no checks, `serializable` => check for concurrent inserts
or deletes in destination partitions, `snapshot` => checks for concurrent
deletes in destination partitions. |
-| validate-from-snapshot-id | null | If isolation level is set, identifies
base snapshot from which to check concurrent conflicts. If null, check from the
first un-expired snapshot. Obtain via
`Spark3Util.loadIcebergTable().currentSnapshot().snapshotId()` |
+| isolation-level | null | Desired isolation level for Dataframe overwrite
operations. `null` => no checks (for idempotent writes), `serializable` =>
check for concurrent inserts or deletes in destination partitions, `snapshot`
=> checks for concurrent deletes in destination partitions. |
+| validate-from-snapshot-id | null | If isolation level is set, identity of
base snapshot from which to check concurrent write conflicts into a table.
Should be the snapshot before any reads from the table. Can be obtained via
[Table API](../../api#table-metadata) or [Snapshots
table](../spark-queries#snapshots). If null, checks from the table's first
un-expired snapshot. |
Review comment:
Also, "checks from" would be more clear as "If null, the table's oldest
known snapshot is used"
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