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https://issues.apache.org/jira/browse/HTTPCORE-586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16894807#comment-16894807
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ASF subversion and git services commented on HTTPCORE-586:
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Commit 79e18804e99ea920b69f71c17b4c2a0f3e455c2a in httpcomponents-core's branch
refs/heads/bug-fixes from Linton Miller
[ https://gitbox.apache.org/repos/asf?p=httpcomponents-core.git;h=79e1880 ]
HTTPCORE-586 Improve LaxConnPool max pool size management
> LaxConnPool can do a better job of maintaining pool size limits
> ---------------------------------------------------------------
>
> Key: HTTPCORE-586
> URL: https://issues.apache.org/jira/browse/HTTPCORE-586
> Project: HttpComponents HttpCore
> Issue Type: Improvement
> Components: HttpCore
> Affects Versions: 5.0-beta8
> Reporter: Linton Miller
> Priority: Major
> Fix For: 5.0-beta9
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> LaxConnPool intentionally does not make strong guarantees about enforcing the
> maximum size of the connection pools. However, it has poor behaviour when hit
> with a block of concurrent requests all at once.
> e.g. if the pool max size is 2, and 20 lease request all arrive concurrently
> at once, it may well create 20 connections.
> That's because the pool size is limited by the leased size, but there's a gap
> in the code between testing the size and adding a leased entry:
> {code:java}
> if (pending.isEmpty() && leased.size() < max) {
> final PoolEntry<T, C> entry = new PoolEntry<>(route, timeToLive);
> addLeased(entry);
> {code}
> Thus multiple threads can concurrently pass the leased.size() < max test and
> thus all create a new PoolEntry.
> That can be greatly improved by not using the leased.size() to track pool
> size, but to have a separate explicit AtomicInteger counting the number of
> created PoolEntries.
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