sarthfrey opened a new pull request #27951: [SPARK-30667][CORE] Change BarrierTaskContext allGather method return type URL: https://github.com/apache/spark/pull/27951 This PR proposes that we change the return type of the `BarrierTaskContext.allGather` method to `Array[String]` instead of `ArrayBuffer[String]` since it is immutable. Based on discussion in #27640. cc @zhengruifeng @srowen
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