[
https://issues.apache.org/jira/browse/FLINK-38131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Zakelly Lan resolved FLINK-38131.
---------------------------------
Resolution: Fixed
> Repartition BroadcastState with finished operators
> --------------------------------------------------
>
> Key: FLINK-38131
> URL: https://issues.apache.org/jira/browse/FLINK-38131
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.14.0
> Reporter: Renxiang Zhou
> Assignee: Renxiang Zhou
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.2.0
>
> Attachments: image-2025-07-22-17-34-22-479.png
>
>
> FLINK-23475 proposes how to distribute Broadcast state to new operator
> instances to avoid new instances getting empty Broadcast state when there are
> some finished operator in the DAG, and the task is restarted without changing
> the parallelism. However, the current implementation seems to have some
> problems in determining whether there is a finished operator.
> As the pic shown below, `isPartiallyReported` compares the value between
> BitSet's
> `cardinality` and `size`, where `cardinality` represents the number of
> operators that contain the Broadcast state, but `size` just returns the
> number of bits of space actually in use by this BitSet. It makes no sense to
> compare these two parameters, which causes the Broadcast state of operators
> without finished status to be redistributed when the parallelism does not
> change, which is unnecessary. I think we should use the `parallelism` in the
> constructor instead of `reportedSubtaskIndices.size()`
> !image-2025-07-22-17-34-22-479.png|width=528,height=334!
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
