FiV0 opened a new issue, #141:
URL: https://github.com/apache/arrow-java/issues/141
### Describe the bug, including details regarding any error messages,
version, and platform.
The following snippet
```java
package org.apache.arrow.vector;
import org.apache.arrow.memory.ArrowBuf;
import org.apache.arrow.memory.RootAllocator;
import org.junit.jupiter.api.Test;
public class BufferAllocatorOverAllocation {
@Test
void overallocation() {
RootAllocator allocator = new RootAllocator();
ArrowBuf buf = allocator.buffer(9946);
System.out.println(buf.capacity());
buf.capacity(9946);
System.out.println(buf.capacity());
}
}
```
prints
```
16384
9946
```
So 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:
```
Note 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.
```
Tested against the `14.0.2` tag.
### Component(s)
Java
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