Aljoscha Krettek created FLINK-8001: ---------------------------------------
Summary: Mark Kafka Consumer as idle if it doesn't have partitions Key: FLINK-8001 URL: https://issues.apache.org/jira/browse/FLINK-8001 Project: Flink Issue Type: Bug Reporter: Aljoscha Krettek Priority: Blocker Fix For: 1.4.0, 1.3.3 In Flink 1.3.x the Kafka Consumer will emit a {{Long.MAX_VALUE}} watermark if it has zero partitions assigned. If this happens and other parallel instances of the Kafka Consumer are marked as idle (which currently never happens by default but does happen in custom forks of our Kafka code) this means that the watermark jumps to {{Long.MAX_VALUE}} downstream. In Flink 1.4.x this happens implicitly in the {{PeriodicWatermarkEmitter}} in {{AbstractFetcher}} where the watermark is {{Long.MAX_VALUE}} if we don't have any partitions. This should be changed to mark the source as idle instead, if we don't have any partitions. -- This message was sent by Atlassian JIRA (v6.4.14#64029)