dcapwell commented on code in PR #3481:
URL: https://github.com/apache/cassandra/pull/3481#discussion_r1724288916
##########
src/java/org/apache/cassandra/db/virtual/AccordVirtualTables.java:
##########
@@ -246,6 +257,96 @@ public DataSet data()
}
}
+ public static class TxnStateTable extends AbstractVirtualTable
+ {
+ private final UserType partitionKeyType;
+ private final UserType cfkType;
+
+ protected TxnStateTable(String keyspace)
+ {
+ super(TableMetadata.builder(keyspace, "txn_state")
+ .kind(TableMetadata.Kind.VIRTUAL)
+ .addPartitionKeyColumn("txn_id",
UTF8Type.instance)
+ .addClusteringColumn("shard",
Int32Type.instance)
+ .addRegularColumn("save_status",
UTF8Type.instance)
+ .addRegularColumn("waiting_on_txns",
MapType.getInstance(UTF8Type.instance, UTF8Type.instance, false))
+ .addRegularColumn("waiting_on_keys",
MapType.getInstance(pkType(keyspace), cfkType(keyspace), false))
+ .build());
+ partitionKeyType = pkType(keyspace);
+ cfkType = cfkType(keyspace);
+ }
+
+ private static UserType pkType(String keyspace)
+ {
+ return new UserType(keyspace, bytes("partition_key"),
+
Arrays.asList(FieldIdentifier.forQuoted("table"),
FieldIdentifier.forQuoted("token")),
+ Arrays.asList(UTF8Type.instance,
UTF8Type.instance), false);
+ }
+
+ private ByteBuffer pk(PartitionKey pk)
+ {
+ var tm = Schema.instance.getTableMetadata(pk.table());
+ return
partitionKeyType.pack(UTF8Type.instance.decompose(tm.toString()),
+
UTF8Type.instance.decompose(pk.token().toString()));
+ }
+
+ private static UserType cfkType(String keyspace)
+ {
+ return new UserType(keyspace, bytes("commands_for_key"),
+
Arrays.asList(FieldIdentifier.forQuoted("next_to_apply"),
FieldIdentifier.forQuoted("min_undecided")),
+ Arrays.asList(UTF8Type.instance,
UTF8Type.instance), false);
+ }
+
+ private ByteBuffer cfk(TxnState.CommandsForKeyState cfk)
+ {
+ if (cfk == null) return ByteBufferUtil.EMPTY_BYTE_BUFFER;
+ return cfkType.pack(cfk.nextWaitingToApply == null ?
ByteBufferUtil.EMPTY_BYTE_BUFFER :
UTF8Type.instance.decompose(cfk.nextWaitingToApply.toString()),
+ cfk.minUndecided == null ?
ByteBufferUtil.EMPTY_BYTE_BUFFER :
UTF8Type.instance.decompose(cfk.minUndecided.plainTxnId().toString()));
+ }
+
+ @Override
+ public Iterable<UserType> userTypes()
+ {
+ return Arrays.asList(partitionKeyType, cfkType);
+ }
+
+ @Override
+ public DataSet data(DecoratedKey partitionKey)
Review Comment:
we spoke in slack, each txn now has its own row
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