tweise commented on a change in pull request #6980: [FLINK-5697] [kinesis] Add
periodic per-shard watermark support
URL: https://github.com/apache/flink/pull/6980#discussion_r235149642
##########
File path:
flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/KinesisDataFetcher.java
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@@ -182,6 +189,28 @@
private volatile boolean running = true;
+ private final AssignerWithPeriodicWatermarks<T>
periodicWatermarkAssigner;
+
+ /**
+ * The watermark related state for each shard consumer. Entries in this
map will be created when shards
+ * are discovered. After recovery, this shard map will be recreated,
possibly with different shard index keys,
+ * since those are transient and not part of checkpointed state.
+ */
+ private ConcurrentHashMap<Integer, ShardWatermarkState> shardWatermarks
= new ConcurrentHashMap<>();
Review comment:
The mapping can change after recovery. It is not necessary to checkpoint
this though because the watermarks are derived information.
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