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https://issues.apache.org/jira/browse/SPARK-3384?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-3384.
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Resolution: Not a Problem
Given the discussion, I do not see evidence that there is a problem in the code
at this point.
> Potential thread unsafe Breeze vector addition in KMeans
> --------------------------------------------------------
>
> Key: SPARK-3384
> URL: https://issues.apache.org/jira/browse/SPARK-3384
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Reporter: RJ Nowling
>
> In the KMeans clustering implementation, the Breeze vectors are accumulated
> using +=. For example,
> https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/mllib/clustering/KMeans.scala#L162
> This is potentially a thread unsafe operation. (This is what I observed in
> local testing.) I suggest changing the += to + -- a new object will be
> allocated but it will be thread safe since it won't write to an old location
> accessed by multiple threads.
> Further testing is required to reproduce and verify.
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