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

["Wenchen Fan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-20989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-20989.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0

Issue resolved by pull request 18290
[https://github.com/apache/spark/pull/18290]

> 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
>            Priority: Minor
>             Fix For: 2.3.0
>
>
> 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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