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• I had searched in the issues and found no similar issues.

What happened

    @Override
    public void onWorkerGroupChange(List<WorkerGroup> workerGroups) {
        for (WorkerGroup workerGroup : workerGroups) {
            List<String> activeWorkers = WorkerGroupUtils.getWorkerAddressListFromWorkerGroup(workerGroup)
                    .stream()
                    .map(workerMapping::get)
                    .filter(Objects::nonNull)
                    .map(WorkerServerMetadata::getAddress)
                    .collect(Collectors.toList());
            synchronized (dbWorkerGroupMapping) {
                dbWorkerGroupMapping.put(workerGroup.getName(), activeWorkers);
            }
        }
    }

when master started before worker, onWorkerGroupChange will not add the worker which not started yet, so even the worker started, onServerAdded only affect workerMapping and dbWorkerGroupMapping will not changed, so if not editing worker-group again, the balancer will cannot find the worker.

What you expected to happen

not to filter inactive workers or call onWorkerGroupChange in onServerAdded

How to reproduce

1. set worker group on UI
2. stop masters & workers
3. start master and wait startup
4. start worker
5. start a task, the task will cannot find the worker.

Anything else

No response

Version

dev

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct