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https://issues.apache.org/jira/browse/FLINK-8516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16347000#comment-16347000
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ASF GitHub Bot commented on FLINK-8516:
---------------------------------------
Github user tzulitai commented on a diff in the pull request:
https://github.com/apache/flink/pull/5393#discussion_r165084048
--- Diff:
flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/internals/KinesisDataFetcher.java
---
@@ -584,17 +594,34 @@ private static ShardMetricsReporter
registerShardMetrics(MetricGroup metricGroup
// Miscellaneous utility functions
//
------------------------------------------------------------------------
+ /**
+ * Function to map a Kinesis shard to a Flink subtask index.
+ */
+ public interface ShardToSubtaskIndexFn {
+ /**
+ * Function to map a Kinesis shard to a Flink subtask index.
--- End diff --
This needs a much more stronger Javadoc explaining the contract of
deterministic assignments.
See `KafkaTopicPartitionAssigner` for an example.
> FlinkKinesisConsumer does not balance shards over subtasks
> ----------------------------------------------------------
>
> Key: FLINK-8516
> URL: https://issues.apache.org/jira/browse/FLINK-8516
> Project: Flink
> Issue Type: Bug
> Components: Kinesis Connector
> Affects Versions: 1.4.0, 1.3.2, 1.5.0
> Reporter: Thomas Weise
> Assignee: Thomas Weise
> Priority: Major
>
> The hash code of the shard is used to distribute discovered shards over
> subtasks round robin. This works as long as shard identifiers are sequential.
> After shards are rebalanced in Kinesis, that may no longer be the case and
> the distribution become skewed.
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