Apache Ignite BinaryObject 膨胀 [英] Apache Ignite BinaryObject Bloat

问题描述

我有一个自定义对象，在将其放入 ignite 缓存之前，我将其转换为 BinaryObject(使用 BinaryObjectBuilder).我计算了自定义对象的深度大小，大约 500 字节.

I have a custom object which I am converting to BinaryObject (using the BinaryObjectBuilder) before putting it into ignite cache. I calculated the deep size of my custom object and it is about 500 bytes.

但是当我计算 BinaryObject 的大小时，它高达 8 MB.

But when I calculate the size of BinaryObject, it is a whopping ~8 MB.

这是预期的吗?

推荐答案

如果你看看 BinaryObjectImpl 类，你会看到，有些字段有 @GridDirectTransient注释，这意味着这些字段在序列化过程中会被忽略.这些是非常大的对象，例如 BinaryContext，其中包含相当多的系统内容.

If you take a look at BinaryObjectImpl class, you will see, that some fields have @GridDirectTransient annotations, meaning that these fields are ignored during serialization. These are pretty big objects, like BinaryContext, which contains quite a lot of system stuff.

如果你想获得一个 BinaryObject 的近似大小，你可以将它转换为 BinaryObjectImpl 并调用 BinaryObjectImpl#array() 方法在上面.您将获得一个字节数组，它是您的对象的序列化表示.此数组的大小将为您提供 BinaryObject 大小的近似值.

If you want to get approximation of size of a BinaryObject, you can cast it to BinaryObjectImpl and call BinaryObjectImpl#array() method on it. You will get a byte array which is a serialized representation of your object. Size of this array will give you an approximation of the BinaryObject's size.

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