sjk created SPARK-3893:
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Summary: declare mutableMap/mutableSet explicitly
Key: SPARK-3893
URL: https://issues.apache.org/jira/browse/SPARK-3893
Project: Spark
Issue Type: Sub-task
Components: Spark Core
Affects Versions: 1.1.0
Reporter: sjk
{code:java}
// current
val workers = new HashSet[WorkerInfo]
// sugguest
val workers = new mutable.HashSet[WorkerInfo]
{code}
the other benefit is reminding us whether can use immutable collection instead
of.
most of map we used is mutable.
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