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https://issues.apache.org/jira/browse/HTTPCLIENT-2284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17760590#comment-17760590
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ASF subversion and git services commented on HTTPCLIENT-2284:
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Commit 478ae4fc69354606f8febfb101dfbda872922200 in httpcomponents-client's
branch refs/heads/HTTPCLIENT-2291 from Oleg Kalnichevski
[ https://gitbox.apache.org/repos/asf?p=httpcomponents-client.git;h=478ae4fc6 ]
HTTPCLIENT-2284: internal cache storage improvements
> BasicHttpCacheStorage leaking variant keys in root response's variantMap
> ------------------------------------------------------------------------
>
> Key: HTTPCLIENT-2284
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2284
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpCache
> Affects Versions: 4.5.13
> Reporter: Pascal Lacombe
> Priority: Minor
> Fix For: 5.4-alpha1
>
> Attachments: 0001-Add-disabled-test-for-HTTPCLIENT-2284.patch
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> BasicHttpCacheStorage has a memory leak in the root response's variantMap.
> When a variant cached entry is evicted due to CacheMap being too large, the
> root cache entry does not remove the variant key in its variantMap. This is a
> memory leak that can grow the variantMap indefinitely, or until the root
> entry get's evicted itself.
> Simplified testcase:
> # A request is being sent from a client that contains a header
> "x-my-variant" with a hash of the current timestamp.
> # The server responds 200, with a cacheable response. The response Vary's on
> "x-my-variant"
> # These requests repeat, causing:
> ## The "root" CacheEntry to be kept in CacheMap
> ## The oldest variant CacheEntry to be evicted due to the CacheMap size limit
> ## However the "root" CacheEntry never removes the evicted variant keys from
> the variantMap
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