Ngone51 opened a new pull request, #49350:
URL: https://github.com/apache/spark/pull/49350
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### What changes were proposed in this pull request?
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This PR supports external shuffle service enablement in local-cluster mode.
Unlike the real cluster, where there is only one external shuffle service in
each node, there could be multiple shuffle service in a local cluster. To
support this, we have to use the dynamic port rather than the fixed port
(`spark.shuffle.service.port`) to start the shuffle servieces. And so, worker
would pass this dynamic port via a environment variable
(`TESTING_EXTERNAL_SHUFFLE_SERVICE_PORT`) to the executor process since the
fixed shuffle service port is no-longer valid. This also becomes an issue to
`BlockManagerMaster`, which could also not use the fixed port anymore. So this
PR adds a new RPC `GetShuffleServicePort` for retrieving the dynamic port from
executor to driver. Another similar issue is that `DBProvider` uses the fixed
persist file name in shuffle service. This PR changes it be unique by inserting
a uuid under test mode only.
### Why are the changes needed?
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This allows Spark developers to test features (e.g., shuffle data / rdd
fetch via shuffle service) with the real external shuffle service, which is
more close to the production environment.
### Does this PR introduce _any_ user-facing change?
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No.
### How was this patch tested?
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Updated `ExternalShuffleServiceSuite` (removed the mock of the external
shuffle service).
### Was this patch authored or co-authored using generative AI tooling?
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No.
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