java api: "Out of semaphores to get db connection"

[MartinG]

Hi,

Using the java api, I am seeing this error when attempting many
simultaneous operations:

com.mongodb.DBPortPool$SemaphoresOut: Out of semaphores to get db
connection
at com.mongodb.DBPortPool.get(DBPortPool.java:136)
at com.mongodb.DBTCPConnector$MyPort.get(DBTCPConnector.java:249)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:175)
at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:277)
at com.mongodb.DBCursor._check(DBCursor.java:250)
at com.mongodb.DBCursor._hasNext(DBCursor.java:371)
at com.mongodb.DBCursor.hasNext(DBCursor.java:396)

This looks like something like a connection pool becoming exhausted,
but I would expect it to block until one is available, rather than
erroring.

I am using mongo-java-driver-2.0.jar

Can anyone help?

[Eliot Horowitz]

There is a limit to how many threads it willing to let block.
This is configurable using MongoOptions

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[JonW]

Is this configurable at the server level?

thx.

On Jul 8, 7:22 am, Eliot Horowitz <eliothorow...@gmail.com> wrote:
> There is a limit to how many threads it willing to let block.
> This is configurable using MongoOptions
>
> On Thu, Jul 8, 2010 at 4:38 AM, MartinG <gar...@gmail.com> wrote:
> > Hi,
>
> > Using the java api, I am seeing this error when attempting many
> > simultaneous operations:
>

> > com.mongodb.DBPortPool$SemaphoresOut: Out ofsemaphoresto get db

[Eliot Horowitz]

Yes - see
http://api.mongodb.org/java/2.0/com/mongodb/MongoOptions.html