ajantha-bhat commented on code in PR #9050:
URL: https://github.com/apache/iceberg/pull/9050#discussion_r1392528464
##########
spark/v3.5/spark-extensions/src/test/java/org/apache/iceberg/spark/extensions/TestMerge.java:
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@@ -2944,4 +2945,77 @@ private RowLevelOperationMode mode(Table table) {
String modeName = table.properties().getOrDefault(MERGE_MODE,
MERGE_MODE_DEFAULT);
return RowLevelOperationMode.fromName(modeName);
}
+
+ @Test
+ public void multipleMergeIntoWithSerializableIsolation() throws
InterruptedException {
+ // cannot run tests with concurrency for Hadoop tables without atomic
renames
+ Assumptions.assumeThat(catalogName).isNotEqualToIgnoringCase("testhadoop");
+ // if caching is off, the table is eagerly refreshed during runtime
filtering
+ // this can cause a validation exception as concurrent changes would be
visible
+ Assumptions.assumeThat(cachingCatalogEnabled()).isTrue();
+
+ createAndInitTable("id INT, class INT, value INT");
+ sql(
+ "ALTER TABLE %s SET TBLPROPERTIES('%s' '%s')",
+ tableName, MERGE_ISOLATION_LEVEL, "serializable");
+
+ sql("INSERT INTO TABLE %s VALUES (1001, 1, 10)", tableName);
+ sql("INSERT INTO TABLE %s VALUES (1002, 1, 20)", tableName);
+ sql("INSERT INTO TABLE %s VALUES (1003, 2, 100)", tableName);
+ sql("INSERT INTO TABLE %s VALUES (1004, 2, 200)", tableName);
+ createBranchIfNeeded();
+
+ Thread t1 =
+ new Thread(
+ () ->
+ sql(
+ "MERGE INTO %s t USING (\n"
+ + " SELECT 1005 as id, 2 as class, SUM(value) as
value FROM %s WHERE class = 1\n"
+ + ") u \n"
+ + "ON t.id = u.id\n"
+ + "WHEN MATCHED THEN UPDATE SET t.value = u.value\n"
+ + "WHEN NOT MATCHED THEN INSERT (id, class, value)
VALUES (u.id, u.class, u.value);",
+ commitTarget(), commitTarget()));
+
+ Thread t2 =
+ new Thread(
+ () ->
+ sql(
+ "MERGE INTO %s t USING (\n"
Review Comment:
> Also I didn't see the isolation level usage for `merge-on-read`. I need to
dig deeper on that.
ok. I found the code for `merge-on-read` here (only position deletes since
spark doesn't support equality delete writing)
https://github.com/apache/iceberg/blob/188847428309701c2ec0debf9e94da94b39058b6/spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkPositionDeltaWrite.java#L223-L225
we can have the testcases for that too.
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