NonBlockingAsyncCache: Fixes lambda func capturing the outer context (memory optimization)

[guiyong]

Pull Request Template

Description

Set createValueFunc to null once the Func delegate is not needed. Without breaking the reference, the lambda function will keep capturing of any outer variables, in #4345, DocumentServiceRequest was captured, which prevent GC from recycling the request object, cause memory leak.

Below code, the request object will be captured by singleValueInitFunc delegate.

addresses = await this.serverPartitionAddressCache.GetAsync( 
                         key: partitionKeyRangeIdentity, 
                         singleValueInitFunc: (_) => this.GetAddressesForRangeIdAsync( 
                             request, 
                             cachedAddresses: null, 
                             partitionKeyRangeIdentity.CollectionRid, 
                             partitionKeyRangeIdentity.PartitionKeyRangeId, 
                             forceRefresh: false), 
                         forceRefresh: (_) => false); 

Type of change

Please delete options that are not relevant.

• [] Bug fix (non-breaking change which fixes an issue)

Closing issues

To automatically close an issue: closes #4345

[kirankumarkolli]

Closing due to inactivity, feel free to re-open as needed.

[guiyong]

@kirankumarkolli, could you please let me know where I can re-open it. Thanks!

[kirankumarkolli]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[FabianMeiswinkel]

LGTM

[kirankumarkolli]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[guiyong]

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[guiyong]

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