com.mongodb.MongoInterruptedException: A driver operation has been interrupted

[Srividhya Shanmugam]

I m getting the following exception in my application

com.mongodb.MongoInterruptedException: A driver operation has been interrupted

at com.mongodb.DBPortPool.get(DBPortPool.java:216)

at com.mongodb.DBTCPConnector$MyPort.get(DBTCPConnector.java:440)

at com.mongodb.DBTCPConnector.say(DBTCPConnector.java:177)

at com.mongodb.DBTCPConnector.say(DBTCPConnector.java:155)

at com.mongodb.DBApiLayer$MyCollection.update(DBApiLayer.java:349)

at com.mongodb.DBCollection.update(DBCollection.java:177)

at com.mongodb.DBCollection.save(DBCollection.java:817)

at com.mongodb.DBCollection.save(DBCollection.java:785)

at cherrypick.ck.datalayer.mongo.MongoDataAccessLayer.saveObject(MongoDataAccessLayer.java:361)

at cherrypick.ck.emailinterface.CKMailMonitor.processIncomingMessage(CKMailMonitor.java:170)

at cherrypick.ck.emailinterface.CKMailMonitor.monitorNewMessages(CKMailMonitor.java:253)

at cherrypick.ck.emailinterface.CKMailMonitor.run(CKMailMonitor.java:275)

Caused by: java.lang.InterruptedException

at java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1325)

at java.util.concurrent.Semaphore.tryAcquire(Semaphore.java:414)

at com.mongodb.util.SimplePool.permitAcquired(SimplePool.java:148)

at com.mongodb.util.SimplePool.get(SimplePool.java:110)

at com.mongodb.DBPortPool.get(DBPortPool.java:214)

My connection settings are

MongoOptions options = new MongoOptions();

        options.autoConnectRetry = true;

        options.connectionsPerHost = 40;

        options.threadsAllowedToBlockForConnectionMultiplier = 25;

Please help to solve this issue.

[Jeff Yemin]

The Java driver itself does not interrupt any threads, so it must be something in your application (or application server) that is interrupting this thread.  Some application servers will interrupt a thread that has not responded after a certain time period, so that is a likely cause.

You might try bumping up connectionsPerHost to a higher value, as it looks like you have contention for connections in the pool.

Regards,

Jeff

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[Srividhya Shanmugam]

I m doing DB operations in a Thread and I get this exception while querying mongodb. But I m not calling any Thread.interrupt. Please help me to find the problem.

please help me to simulate the problem.

Thanks and Regards,

Vidya

[mchelyada]

Btw, 

Looks like I am faced to connection contention issue as well. And I have a suspicion that it is caused not only by small number of connection configured(I have not so small value - 30) and/or big number of threads accessing mongo client, but also "fairness" disabled.

I.e. as far as I can see:

public SimplePool(String name, int size){

        _name = name;

        _size = size;

        _sem = new Semaphore(size);

    }

so semaphore is being instantiated with "fairness" disabled. 

Can that be the case? Have somebody been faced to similar issue?

Thanks,

[Jeff Yemin]

Looks like you are using an older version of the driver.  If you upgrade to 2.12.3, fairness is enabled on the Semaphore.  See https://github.com/mongodb/mongo-java-driver/blob/2.12.x/src/main/com/mongodb/ConcurrentPool.java#L54-54.

[mchelyada]

Oh, thanks.

I was looking into legacy deprecated class SimplePool instead of this new one.

Will upgrade driver than.