srowen opened a new pull request #23600: [SPARK-26228][MLLIB] OOM issue encountered when computing Gramian matrix URL: https://github.com/apache/spark/pull/23600 ## What changes were proposed in this pull request? Avoid memory problems in closure cleaning when handling large Gramians (>= 16K rows/cols) by using null as zeroValue ## How was this patch tested? Existing tests. Note that it's hard to test the case that triggers this issue as it would require a large amount of memory and run a while. I confirmed locally that a 16K x 16K Gramian failed with tons of driver memory before, and didn't fail upfront after this change.
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