hqx871 commented on PR #21435:
URL: https://github.com/apache/doris/pull/21435#issuecomment-1619541478
> “For LRUHandle, all fields should be put ahead of key_data.” why? Is there
anything wrong if we keep the previous order? @hqx871
The LRUHandle is allocated using malloc and starting from field key_data is
for key data.
```
size_t handle_size = sizeof(LRUHandle) - 1 + key.size();
LRUHandle* e = reinterpret_cast<LRUHandle*>(malloc(handle_size));
e->value = value;
e->deleter = deleter;
e->charge = charge;
e->key_length = key.size();
e->total_size = (_type == LRUCacheType::SIZE ? handle_size + charge : 1);
DCHECK(_type == LRUCacheType::SIZE || bytes != -1) << " _type " << _type;
e->bytes = (_type == LRUCacheType::SIZE ? handle_size + charge :
handle_size + bytes);
e->hash = hash;
e->refs = 2; // one for the returned handle, one for LRUCache.
e->next = e->prev = nullptr;
e->in_cache = true;
e->priority = priority;
e->mem_tracker = tracker;
e->type = _type;
memcpy(e->key_data, key.data(), key.size());
```
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