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https://issues.apache.org/jira/browse/TINKERPOP-1351?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stephen mallette updated TINKERPOP-1351:
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Affects Version/s: (was: 3.2.0-incubating)
3.1.2-incubating
> Nb of connections going beyond the pool max size
> ------------------------------------------------
>
> Key: TINKERPOP-1351
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1351
> Project: TinkerPop
> Issue Type: Bug
> Components: driver
> Affects Versions: 3.1.2-incubating
> Environment: RESTful web service using gremlin driver to send request
> to a Gremlin Server
> Reporter: Ramzi Oueslati
> Fix For: 3.1.3, 3.2.1
>
>
> When the gremlin driver is used with an important number of concurrent
> requests, sockets are opened far beyond the max pool size.
> At some point, the connections are destroyed, the pool is empty and then the
> borrowConnection process goes through :
> {code:java}
> if (connections.isEmpty()) {
> logger.debug("Tried to borrow connection but the pool was empty
> for {} - scheduling pool creation and waiting for connection", host);
> for (int i = 0; i < minPoolSize; i++) {
> scheduledForCreation.incrementAndGet();
> newConnection();
> }
> return waitForConnection(timeout, unit);
> }
> {code}
> If many connections are borrowed at the same time then this code will
> schedule as many connections for creation.
> I added a check :
> {code:java}
> for (int i = 0; i < minPoolSize; i++) {
> if (scheduledForCreation.get() < minPoolSize) {
> scheduledForCreation.incrementAndGet();
> logger.debug("borrowConnection: [inc]
> scheduledForCreation=" + scheduledForCreation.get());
> newConnection();
> }
> }
> {code}
> It seems to solve the problem.
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