Clustering: akka.pattern.AskTimeoutException when sending large amounts of BGP data to EXABGP

The following exception occurs when I try to send 100000 routes through BGP into any clustered setup. Tested on https://jenkins.opendaylight.org/integration/view/Integration%20jobs/job/integration-master-project-centralized-integration/lastSuccessfulBuild/artifact/distributions/extra/karaf/target/distribution-karaf-0.3.0-SNAPSHOT.tar.gz:

akka.pattern.AskTimeoutException: Ask timed out on ActorSelection[Anchor(akka://opendaylight-cluster-data/), Path(/user/shardmanager-operational/member-1-shard-default-operational/shard-member-1-txn-88#1797666910)] after [5000 ms]
at akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:333)[312:com.typesafe.akka.actor:2.3.4]
at akka.actor.Scheduler$$anon$7.run(Scheduler.scala:117)[312:com.typesafe.akka.actor:2.3.4]
at scala.concurrent.Future$InternalCallbackExecutor$.scala$concurrent$Future$InternalCallbackExecutor$$unbatchedExecute(Future.scala:694)[309:org.scala-lang.scala
-library:2.10.4.v20140209-180020-VFINAL-b66a39653b]
at scala.concurrent.Future$InternalCallbackExecutor$.execute(Future.scala:691)[309:org.scala-lang.scala-library:2.10.4.v20140209-180020-VFINAL-b66a39653b]
at akka.actor.LightArrayRevolverScheduler$TaskHolder.executeTask(Scheduler.scala:467)[312:com.typesafe.akka.actor:2.3.4]
at akka.actor.LightArrayRevolverScheduler$$anon$8.executeBucket$1(Scheduler.scala:419)[312:com.typesafe.akka.actor:2.3.4]
at akka.actor.LightArrayRevolverScheduler$$anon$8.nextTick(Scheduler.scala:423)[312:com.typesafe.akka.actor:2.3.4]
at akka.actor.LightArrayRevolverScheduler$$anon$8.run(Scheduler.scala:375)[312:com.typesafe.akka.actor:2.3.4]
at java.lang.Thread.run(Unknown Source)[:1.7.0_67]

This problem does not occur when I use a non-clustered setup.