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https://issues.apache.org/jira/browse/SPARK-3541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14220283#comment-14220283
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Sean Owen commented on SPARK-3541:
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[~adam.kunicki] Related discussion at
https://issues.apache.org/jira/browse/SPARK-2465
> Improve ALS internal storage
> ----------------------------
>
> Key: SPARK-3541
> URL: https://issues.apache.org/jira/browse/SPARK-3541
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: Xiangrui Meng
> Assignee: Xiangrui Meng
> Original Estimate: 96h
> Remaining Estimate: 96h
>
> The internal storage of ALS uses many small objects, which increases the GC
> pressure and makes ALS difficult to scale to very large scale, e.g., 50
> billion ratings. In such cases, the full GC may take more than 10 minutes to
> finish. That is longer than the default heartbeat timeout and hence executors
> will be removed under default settings.
> We can use primitive arrays to reduce the number of objects significantly.
> This requires big change to the ALS implementation.
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