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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Java] Allocator `buffer` method no setting the capacity correctly.","articleBody":"### Describe the bug, including details regarding any error messages, version, and platform.\n\nThe following snippet\r\n```java\r\npackage org.apache.arrow.vector;\r\n\r\nimport org.apache.arrow.memory.ArrowBuf;\r\nimport org.apache.arrow.memory.RootAllocator;\r\nimport org.junit.jupiter.api.Test;\r\n\r\n\r\npublic class BufferAllocatorOverAllocation {\r\n\r\n    @Test\r\n    void overallocation()  {\r\n        RootAllocator allocator = new RootAllocator();\r\n        ArrowBuf buf = allocator.buffer(9946);\r\n\r\n        System.out.println(buf.capacity());\r\n\r\n        buf.capacity(9946);\r\n\r\n        System.out.println(buf.capacity());\r\n\r\n    }\r\n\r\n}\r\n```\r\nprints\r\n```\r\n16384\r\n9946\r\n```\r\nSo without setting the capacity explicitly the allocator overallocates memory and also seems to set the capacity of the buffer to that. That is contrary to the docstring of the `buffer` method:\r\n```\r\nNote that the buffer may technically be larger than the requested size for rounding purposes. However, the buffer's capacity will be set to the configured size.\r\n```\r\n\r\nTested against the `14.0.2` tag. \r\n\n\n### Component(s)\n\nJava","author":{"url":"https://github.com/FiV0","@type":"Person","name":"FiV0"},"datePublished":"2024-01-11T08:41:19.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/141/arrow-java/issues/141"}