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From tzulitai <...@git.apache.org>
Subject [GitHub] flink pull request #3001: [FLINK-4821] [kinesis] Implement rescalable non-pa...
Date Wed, 19 Apr 2017 06:29:03 GMT
Github user tzulitai commented on a diff in the pull request:

    --- Diff: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/FlinkKinesisConsumer.java
    @@ -194,26 +216,30 @@ public void run(SourceContext<T> sourceContext) throws Exception
     		// all subtasks will run a fetcher, regardless of whether or not the subtask will initially
     		// shards to subscribe to; fetchers will continuously poll for changes in the shard
list, so all subtasks
     		// can potentially have new shards to subscribe to later on
    -		fetcher = new KinesisDataFetcher<>(
    -			streams, sourceContext, getRuntimeContext(), configProps, deserializer);
    +		fetcher = createFetcher(streams, sourceContext, getRuntimeContext(), configProps, deserializer);
     		boolean isRestoringFromFailure = (sequenceNumsToRestore != null);
     		// if we are restoring from a checkpoint, we iterate over the restored
     		// state and accordingly seed the fetcher with subscribed shards states
     		if (isRestoringFromFailure) {
    -			for (Map.Entry<KinesisStreamShard, SequenceNumber> restored : lastStateSnapshot.entrySet())
    +			List<KinesisStreamShard> newShardsCreatedWhileNotRunning = fetcher.discoverNewShardsToSubscribe();
    +			for (KinesisStreamShard shard : newShardsCreatedWhileNotRunning) {
    -					restored.getKey().getStreamName(), restored.getKey().getShard().getShardId());
    +					shard.getStreamName(), shard.getShard().getShardId());
    +				SequenceNumber startingStateForNewShard = lastStateSnapshot.containsKey(shard)
    +					? lastStateSnapshot.get(shard)
    +					: SentinelSequenceNumber.SENTINEL_EARLIEST_SEQUENCE_NUM.get();
    --- End diff --
    Shouldn't the case always be `SentinelSequenceNumber.SENTINEL_EARLIEST_SEQUENCE_NUM.get()`
for newly discovered shards?

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