从可靠的字典中删除项目实际上并不会从内存中删除它们 [英] Removing items from reliable dictionary doesn't actually remove them from memory

问题描述

我正在使用全状态服务，并且正在使用可靠的字典作为工作项存储.代码方面:

I'm having statefull service, and I'm using reliable dictionary as a work item store. Code-wise:

var workItemStore = 
  this.StateManager.GetOrAddAsync<IReliableDictionary<TKey, TValue>>(storeName);

内部调试显示这是对DistributedDictionary类的包装的返回，该包装使用TStore类进行繁重的操作.

Debugging internals shows this is a returns a wrapper over DistributedDictionary class, that is using TStore class to do heavy lifting.

我有一个工作项处理器(有点像队列)，在其中将值添加到此存储区(workItemStore)，完成后将其删除.但是，当我进行内存转储时，即使显式GC.Collect()之后，我仍然可以看到旧的(已删除的)键和值仍然存在.

I have a work item processor (kind of like queue), in which I'm adding values to this store (workItemStore) and after I'm done I'm removing them. However when I make memory dump I still can see the old (removed) keys and values to be present even after explicitly GC.Collect().

示例内存转储:

Object type                       |     Count | Size (Bytes) | Inclusive Size (Bytes)
-------------------------------------------------------------------------------------
LockManager                       |    10,635 |   53,526,856 | 511,008,280
ReaderWriterLockSlim              | 2,772,648 |  261,374,208 | 248,745,216
TStore<Guid, WorkItem, ...>       |     3,236 |   15,999,256 | 216,851,864
Dictionary<UInt64, LockHashValue> | 2,772,560 |  217,807,600 | 207,288,816

向下钻LockManager，ReaderWriterLockSlim和Dictionary<UInt64, LockHashValue>指向TStore中的值.

Drilling down LockManager, ReaderWriterLockSlim and Dictionary<UInt64, LockHashValue> points to values in TStore.

有没有办法强制从IReliableDictionary中清除项目(即从内存中删除已删除的项目)?

Is there a way how to force cleanup of items from IReliableDictionary (i.e. remove removed items from memory) ?

推荐答案

深入研究此问题后，问题是删除仅是逻辑删除-实际上并未从内存中删除项目.尽管将内存中的更改序列化到磁盘后，删除仍应最终发生.

After digging into this the problem is that removal is only logical removal - it doesn't actually remove items from memory. The removal should happen eventually though when in-memory changes are serialized to disk.

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