zymap commented on PR #4607:
URL: https://github.com/apache/bookkeeper/pull/4607#issuecomment-2918429558
You can try the following code to test the Unpooled.buffer() generated bytes.
```
// you
@org.junit.jupiter.api.Test
public void test() throws InterruptedException {
byte[] bytes = new byte[1024];
while (true) {
var buf = Unpooled.buffer(1024);
buf.writerIndex(1024);
if (ByteBufUtil.compare(buf, Unpooled.wrappedBuffer(bytes)) !=
0) {
System.out.println(ByteBufUtil.hexDump(buf));
}
}
}
````
Here is am example output:
```
02000000c8006af880f8acf800000000010000000000000058920400000400000100000000000000486800000004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000
```
In the netty Unpooled allocate, there is a method used to generate the
buffer.
```java
public static byte[] allocateUninitializedArray(int size) {
return UNINITIALIZED_ARRAY_ALLOCATION_THRESHOLD < 0 ||
UNINITIALIZED_ARRAY_ALLOCATION_THRESHOLD > size ?
new byte[size] :
PlatformDependent0.allocateUninitializedArray(size);
}
```
```
int tryAllocateUninitializedArray =
SystemPropertyUtil.getInt("io.netty.uninitializedArrayAllocationThreshold",
1024);
UNINITIALIZED_ARRAY_ALLOCATION_THRESHOLD = javaVersion() >= 9 &&
PlatformDependent0.hasAllocateArrayMethod() ?
tryAllocateUninitializedArray : -1;
```
when you go to use `PlatformDependent0.allocateUninitializedArray(size)` ,
the buffer may not cleaned to use, you have to set 0 by yourself.
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