Github user pnowojski commented on a diff in the pull request:
https://github.com/apache/flink/pull/4368#discussion_r131330545
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/functions/sink/TwoPhaseCommitSinkFunction.java
---
@@ -51,39 +48,52 @@
* @param <TXN> Transaction to store all of the information required to
handle a transaction (must be Serializable)
*/
@PublicEvolving
-public abstract class TwoPhaseCommitSinkFunction<IN, TXN extends
Serializable>
+public abstract class TwoPhaseCommitSinkFunction<IN, TXN>
extends RichSinkFunction<IN>
implements CheckpointedFunction, CheckpointListener {
private static final Logger LOG =
LoggerFactory.getLogger(TwoPhaseCommitSinkFunction.class);
- protected final ListStateDescriptor<TransactionAndCheckpoint<TXN>>
pendingCommitTransactionsDescriptor;
+ protected final ListStateDescriptor<Map<Long, TXN>>
pendingCommitTransactionsDescriptor;
protected final ListStateDescriptor<TXN> pendingTransactionsDescriptor;
- protected final List<TransactionAndCheckpoint<TXN>>
pendingCommitTransactions = new ArrayList<>();
+ protected final LinkedHashMap<Long, TXN> pendingCommitTransactions =
new LinkedHashMap<>();
@Nullable
protected TXN currentTransaction;
protected ListState<TXN> pendingTransactionsState;
- protected ListState<TransactionAndCheckpoint<TXN>>
pendingCommitTransactionsState;
-
- public TwoPhaseCommitSinkFunction(Class<TXN> txnClass) {
- this(
- TypeInformation.of(txnClass),
- TypeInformation.of(new
TypeHint<TransactionAndCheckpoint<TXN>>() {}));
- }
+ protected ListState<Map<Long, TXN>> pendingCommitTransactionsState;
--- End diff --
Whether transactions can be redistributed depends on the system that we
communicate with. For Kafka 0.11 I'm not sure. Now when I think about it a
little bit more, I will change it to `ListState<List<Tuple2<Long, TXN>>>`, so
that we can guarantee that transactions will be recovered in the same order
they were created.
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