Intermittent test failure in ManagedLedgerBkTest.testConcurrentMarkDelete

[merlimat]

Seen failing once on Travis build:

Tests run: 218, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 110.82 sec <<< FAILURE! - in TestSuite
testConcurrentMarkDelete(org.apache.bookkeeper.mledger.impl.ManagedLedgerBkTest)  Time elapsed: 42.069 sec  <<< FAILURE!
java.util.concurrent.ExecutionException: org.apache.bookkeeper.mledger.ManagedLedgerException$MetaStoreException: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss
    at org.apache.bookkeeper.mledger.impl.ManagedLedgerBkTest.testConcurrentMarkDelete(ManagedLedgerBkTest.java:273)
Caused by: org.apache.bookkeeper.mledger.ManagedLedgerException$MetaStoreException: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss
Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss
Results :
Failed tests: 
  ManagedLedgerBkTest.testConcurrentMarkDelete:273 » Execution org.apache.bookke...