[ https://issues.apache.org/jira/browse/FLINK-26004?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lijie Wang updated FLINK-26004: ------------------------------- Summary: Introduce ForwardForConsecutiveHashPartitioner (was: Introduce ForwardForLocalKeyByPartitioner) > Introduce ForwardForConsecutiveHashPartitioner > ---------------------------------------------- > > Key: FLINK-26004 > URL: https://issues.apache.org/jira/browse/FLINK-26004 > Project: Flink > Issue Type: Sub-task > Reporter: Lijie Wang > Priority: Major > Labels: pull-request-available > > If there are multiple consecutive the same groupBy(i.e. keyBy), SQL planner > will change them except the first one to use forward partitioner, so that > these operators can be chained to reduce unnecessary shuffles. > However, sometimes the local keyBy operators are not chained (e.g. multiple > inputs), and this kind of forward partitioners will turn into forward job > edges. These forward edges still have the local keyBy assumption, so that > they cannot be changed into rescale/rebalance edges, otherwise it can lead to > incorrect results. This prevents the adaptive batch scheduler from > determining parallelism for other forward edge downstream job vertices (seeĀ > FLINK-25046). > To solve it, I propose to introduce a new > {{{}ForwardForLocalKeyByPartitioner{}}}. When SQL planner optimizes the case > of multiple consecutive the same groupBy, it should use the proposed > partitioner, so that the runtime framework can further decide whether the > partitioner can be changed to hash or not. > h4. -- This message was sent by Atlassian Jira (v8.20.1#820001)