[jira] [Created] (SPARK-20989) Fail to start multiple workers on one host if external shuffle service is enabled in standalone mode

["Jiang Xingbo (JIRA)" <ji...@apache.org>]

Jiang Xingbo created SPARK-20989:
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             Summary: Fail to start multiple workers on one host if external shuffle service is enabled in standalone mode
                 Key: SPARK-20989
                 URL: https://issues.apache.org/jira/browse/SPARK-20989
             Project: Spark
          Issue Type: Bug
          Components: Deploy, Spark Core
    Affects Versions: 2.1.1
            Reporter: Jiang Xingbo


In standalone mode, if we enable external shuffle service by setting `spark.shuffle.service.enabled` to true, and then we try to start multiple workers on one host(by setting `SPARK_WORKER_INSTANCES=3` in spark-env.sh, and then run `sbin/start-slaves.sh`), we can only launch one worker on each host successfully and the rest of the workers fail to launch.

The reason is the port of external shuffle service if configed by `spark.shuffle.service.port`, so currently we could start no more than one external shuffle service on each host. In our case, each worker tries to start a external shuffle service, and only one of them successed doing this.



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