belliottsmith commented on code in PR #3481:
URL: https://github.com/apache/cassandra/pull/3481#discussion_r1721586509
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src/java/org/apache/cassandra/db/virtual/AccordVirtualTables.java:
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@@ -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:
perhaps we should emit a row for each dependency we can find that is
blocking execution on this replica? i.e. we should walk the current execution
dependency chain. This can also be naturally extended to perform a distributed
walk to list the chain of dependencies before a transaction
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