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https://issues.apache.org/jira/browse/FLINK-7407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tzu-Li (Gordon) Tai reassigned FLINK-7407:
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Assignee: Tzu-Li (Gordon) Tai
> Assumption of partition id strict contiguity is too naive in Kafka consumer's
> AbstractPartitionDiscoverer
> ---------------------------------------------------------------------------------------------------------
>
> Key: FLINK-7407
> URL: https://issues.apache.org/jira/browse/FLINK-7407
> Project: Flink
> Issue Type: Improvement
> Components: Kafka Connector
> Affects Versions: 1.4.0
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Critical
> Fix For: 1.4.0
>
>
> In the Kafka Consumer's {{AbstractPartitionDiscoverer}}, for partition
> discovery, already discovered partitions are tracked with the following map:
> {code}
> Map<String, Integer> topicsToLargestDiscoveredPartitionId
> {code}
> Simply put, on each discovery attempt's metadata fetch, all partition ids of
> a given topic that are smaller than the largest seen id will be ignored and
> not assigned. This approach lies on the assumption that fetched partition ids
> of a single topic are always strictly contiguous starting from 0.
> This assumption may be too naive, in that partitions which were temporarily
> unavailable at the time of a discovery would be shadowed by available
> partitions with larger ids, and from then on would be left unassigned.
> We should redesign how the {{AbstractPartitionDiscoverer}} tracks discovered
> partitions by not relying on the contiguity assumption, and also add test
> cases for non-contiguous fetched partition ids.
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