jacek-lewandowski commented on code in PR #2081:
URL: https://github.com/apache/cassandra/pull/2081#discussion_r1069386615
##########
test/unit/org/apache/cassandra/io/sstable/LegacySSTableTest.java:
##########
@@ -686,4 +689,77 @@ private static void copyFile(File cfDir, File file) throws
IOException
}
}
}
+
+ /**
+ * Finds the first point at which the HashSet inserts a generation before
a previous
+ * generation in the set. This is used in testing to verfy the sequence of
tables where
+ * the generation order is significant.
+ * @param legacyVersion the legacy version to work with.
+ * @return the generation that causes of the inversion.
+ */
+ public static int findInversion(String legacyVersion) {
+ String ksname = "legacy_tables";
+ String cfname = String.format("legacy_%s_multiple", legacyVersion);;
+ SSTableFormat.Type formatType = SSTableFormat.Type.BIG;
+ int generation = 0;
+ SequenceBasedSSTableId id = new SequenceBasedSSTableId(generation);
+ File directory = new File( System.getProperty("java.io.tmpdir"));
+ Version version = formatType.info.getVersion(legacyVersion);
+ Descriptor descriptor = new Descriptor( version, directory, ksname,
cfname, id, formatType);
+ HashSet<Descriptor> set = new HashSet<>();
+ set.add( descriptor );
+ Object[] arry = set.toArray();
Review Comment:
I was thinking about something like this:
```java
static <T> T findFirstUnordered(java.util.function.Function<T, T>
provider)
{
HashSet<T> set = new HashSet<>(2);
T first = null;
while (true)
{
T second = provider.apply(first);
if (first != null)
{
set.add(first);
set.add(second);
if (set.iterator().next() != first)
return second;
}
first = second;
}
}
```
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