parthchandra opened a new pull request #24957: [SPARK-27100][SQL] Use `Array` instead of `Seq` in `FilePartition` to… URL: https://github.com/apache/spark/pull/24957 … prevent `StackOverflowError ` ShuffleMapTask's partition field is a FilePartition and FilePartition's 'files' field is a Stream$cons which is essentially a linked list. It is therefore serialized recursively. If the number of files in each partition is, say, 10000 files, recursing into a linked list of length 10000 overflows the stack The problem is only in Bucketed partitions. The corresponding implementation for non Bucketed partitions uses a StreamBuffer. The proposed change applies the same for Bucketed partitions. Existing unit tests. Added new unit test. The unit test fails without the patch. Manual testing on dataset used to reproduce the problem.
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