RegionWithHDFSPersistenceBasicDUnitTest.testPUTDMLBulkSupport fails intermittently with suspect string

java.lang.AssertionError: Suspicious strings were written to the log during this run.
Fix the strings or use DistributedTestCase.addExpectedException to ignore.
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Found suspect string in log4j at line 1067

[error 2015/09/19 22:55:33.420 PDT <Event Processor for GatewaySender_AsyncEventQueue_HDFS_QUEUE__testPUTDMLBulkSupport_3> tid=0x22db] Could not ping one of the following servers: [cc2-rh6(5582)<v420>:62377]
java.lang.InterruptedException
	at com.gemstone.gemfire.distributed.internal.ReplyProcessor21.waitForReplies(ReplyProcessor21.java:686)
	at com.gemstone.gemfire.distributed.internal.ReplyProcessor21.waitForReplies(ReplyProcessor21.java:648)
	at com.gemstone.gemfire.internal.cache.ServerPingMessage.send(ServerPingMessage.java:75)
	at com.gemstone.gemfire.internal.cache.BucketRegion.areSecondariesPingable(BucketRegion.java:2594)
	at com.gemstone.gemfire.cache.hdfs.internal.hoplog.AbstractHoplogOrganizer.pingSecondaries(AbstractHoplogOrganizer.java:373)
	at com.gemstone.gemfire.cache.hdfs.internal.hoplog.HdfsSortedOplogOrganizer.flush(HdfsSortedOplogOrganizer.java:260)
	at com.gemstone.gemfire.cache.hdfs.internal.HDFSEventListener.processEvents(HDFSEventListener.java:115)
	at com.gemstone.gemfire.internal.cache.wan.GatewaySenderEventCallbackDispatcher.dispatchBatch(GatewaySenderEventCallbackDispatcher.java:164)
	at com.gemstone.gemfire.internal.cache.wan.GatewaySenderEventCallbackDispatcher.dispatchBatch(GatewaySenderEventCallbackDispatcher.java:83)
	at com.gemstone.gemfire.internal.cache.wan.AbstractGatewaySenderEventProcessor.processQueue(AbstractGatewaySenderEventProcessor.java:583)
	at com.gemstone.gemfire.internal.cache.wan.AbstractGatewaySenderEventProcessor.run(AbstractGatewaySenderEventProcessor.java:1028)