Github user tzulitai commented on a diff in the pull request: https://github.com/apache/flink/pull/3001#discussion_r112122336 --- Diff: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/FlinkKinesisConsumer.java --- @@ -267,38 +293,84 @@ public void close() throws Exception { // ------------------------------------------------------------------------ @Override - public HashMap<KinesisStreamShard, SequenceNumber> snapshotState(long checkpointId, long checkpointTimestamp) throws Exception { + public void snapshotState(FunctionSnapshotContext context) throws Exception { if (lastStateSnapshot == null) { LOG.debug("snapshotState() requested on not yet opened source; returning null."); - return null; - } - - if (fetcher == null) { + } else if (fetcher == null) { LOG.debug("snapshotState() requested on not yet running source; returning null."); - return null; - } - - if (!running) { + } else if (!running) { LOG.debug("snapshotState() called on closed source; returning null."); - return null; + } else { + if (LOG.isDebugEnabled()) { + LOG.debug("Snapshotting state ..."); + } + + offsetsStateForCheckpoint.clear(); + lastStateSnapshot = fetcher.snapshotState(); + + if (LOG.isDebugEnabled()) { + LOG.debug("Snapshotted state, last processed sequence numbers: {}, checkpoint id: {}, timestamp: {}", + lastStateSnapshot.toString(), context.getCheckpointId(), context.getCheckpointTimestamp()); + } + + for (Map.Entry<KinesisStreamShard, SequenceNumber> entry : lastStateSnapshot.entrySet()) { + offsetsStateForCheckpoint.add(Tuple2.of(entry.getKey(), entry.getValue())); + } } + } - if (LOG.isDebugEnabled()) { - LOG.debug("Snapshotting state ..."); + @Override + public void initializeState(FunctionInitializationContext context) throws Exception { + TypeInformation<Tuple2<KinesisStreamShard, SequenceNumber>> tuple = new TupleTypeInfo<>( + TypeInformation.of(KinesisStreamShard.class), + TypeInformation.of(SequenceNumber.class) + ); + + offsetsStateForCheckpoint = context.getOperatorStateStore().getUnionListState( + new ListStateDescriptor<>(DefaultOperatorStateBackend.DEFAULT_OPERATOR_STATE_NAME, tuple)); + + if (context.isRestored()) { + if (sequenceNumsToRestore == null) { + sequenceNumsToRestore = new HashMap<>(); + for (Tuple2<KinesisStreamShard, SequenceNumber> kinesisOffset : offsetsStateForCheckpoint.get()) { --- End diff -- I would rename this to `kinesisSeqNum` for consistency, because "offset" is the Kafka term while "sequence number" is the Kinesis term :)
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