YufeiLiu created FLINK-15959:
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Summary: Add TaskExecutor number option in FlinkYarnSessionCli
Key: FLINK-15959
URL: https://issues.apache.org/jira/browse/FLINK-15959
Project: Flink
Issue Type: New Feature
Components: Runtime / Coordination
Affects Versions: 1.11.0
Reporter: YufeiLiu
Flink removed `-n` option after FLIP-6, change to ResourceManager start a new
worker when required. But I think maintain a TaskExecutor number option is
necessary. These workers will start immediately when ResourceManager starts and
would not release even if all slots are free.
Here are some resons:
# Users actually how many resources are needed when run a single job,
initialize all workers when cluster starts can speed up startup process.
# Job schedule in topology order, next operator won't schedule until prior
execution slot allocated. The TaskExecutors will start in several batchs in
some cases, it might slow down the startup speed.
# Flink support [FLINK-12122|https://issues.apache.org/jira/browse/FLINK-12122]
[Spread out tasks evenly across all available registered TaskManagers], but it
will only effect if all TMs are registered. Start all TMs at begining can slove
this problem.
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