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https://issues.apache.org/jira/browse/TS-1287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leif Hedstrom resolved TS-1287.
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    Resolution: Invalid

yeah, this is just the way the cache works. The storage will be reclaimed at 
some later time, when it is needed for a new object. Deleteing an object out of 
cache just makes it unreachable, as you've discovered.
                
> Need a way to do garbage collection when cache entry deleted
> ------------------------------------------------------------
>
>                 Key: TS-1287
>                 URL: https://issues.apache.org/jira/browse/TS-1287
>             Project: Traffic Server
>          Issue Type: Bug
>          Components: Cache
>    Affects Versions: 3.0.0
>            Reporter: Hua Cai
>
> we are developing a cache system based on traffic server SDK in which we hope 
> to select cache entries to delete by our own algorithm. We use 
> "TSCacheRemove" to delete cache entries. However, it seems that the space 
> occupied by the cache entry does not released from cache storage. 
> we really hope to know how to recycle cache resource.
> by the way, we found that when the storage was full, further "cache wirte" 
> would still success. But when we tried to read those cache enties, we got "NO 
> DOC" failure.    

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