belliottsmith commented on code in PR #26:
URL: https://github.com/apache/cassandra-accord/pull/26#discussion_r1093765145
##########
accord-core/src/main/java/accord/primitives/Txn.java:
##########
@@ -32,13 +32,26 @@
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
-import static accord.primitives.Routables.Slice.Overlapping;
-
public interface Txn
{
enum Kind
{
- Read, Write;
+ Read,
+ Write,
+
+ /**
+ * A pseudo-transaction whose deps represent the complete set of
transactions that may execute before it,
+ * without interfering with their execution.
+ *
+ * A SyncPoint is unique in that it agrees not only an executeAt but
also a precise collection of dependencies,
+ * so that is effect on invalidation of earlier transactions is
durable. This is most useful for ExclusiveSyncPoint.
Review Comment:
An `ExclusiveSyncPoint` invalidates all `TxnId` lower than it that aren't
witnessed by it.
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