Github user jiangxb1987 commented on a diff in the pull request: https://github.com/apache/spark/pull/19077#discussion_r144037069 --- Diff: common/unsafe/src/main/java/org/apache/spark/unsafe/memory/MemoryBlock.java --- @@ -48,6 +49,15 @@ public long size() { } /** + * Reset the size of the memory block. + */ + public void resetSize(long len) { + assert (ByteArrayMethods.roundNumberOfBytesToNearestWord(length) == --- End diff -- We'd better use `require` instead of `assert`.
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