20:00:32.985 [pulsar-stats-updater-22-1] ERROR o.a.p.broker.service.PulsarStats     - Failed to generate namespace stats for namespace xxxx/global/yyyy: Invalid range: [1566977:0..1379500:30)
java.lang.IllegalArgumentException: Invalid range: [1566977:0..1379500:30)
        at com.google.common.collect.Range.<init>(Range.java:352) ~[guava-21.0.jar:na]
        at com.google.common.collect.Range.create(Range.java:146) ~[guava-21.0.jar:na]
        at com.google.common.collect.Range.closedOpen(Range.java:182) ~[guava-21.0.jar:na]
        at org.apache.bookkeeper.mledger.impl.ManagedCursorImpl.getNumberOfEntries(ManagedCursorImpl.java:655) ~[managed-ledger-original-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.lambda$checkBackloggedCursors$6(ManagedLedgerImpl.java:835) ~[managed-ledger-original-2.1.1-incubating.jar:2.1.1-incubating]
        at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_181]
        at org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.checkBackloggedCursors(ManagedLedgerImpl.java:834) ~[managed-ledger-original-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.broker.service.PulsarStats.lambda$5(PulsarStats.java:141) ~[pulsar-broker-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:386) ~[pulsar-common-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:160) ~[pulsar-common-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.broker.service.PulsarStats.lambda$3(PulsarStats.java:131) ~[pulsar-broker-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:386) ~[pulsar-common-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:160) ~[pulsar-common-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.broker.service.PulsarStats.lambda$0(PulsarStats.java:120) ~[pulsar-broker-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:386) ~[pulsar-common-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:160) ~[pulsar-common-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.broker.service.PulsarStats.updateStats(PulsarStats.java:110) ~[pulsar-broker-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.pulsar.broker.service.BrokerService.updateRates(BrokerService.java:852) ~[pulsar-broker-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.bookkeeper.mledger.util.SafeRun$1.safeRun(SafeRun.java:32) ~[managed-ledger-original-2.1.1-incubating.jar:2.1.1-incubating]
        at org.apache.bookkeeper.common.util.SafeRunnable.run(SafeRunnable.java:36) ~[bookkeeper-common-4.7.2.jar:4.7.2]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_181]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) ~[na:1.8.0_181]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) ~[na:1.8.0_181]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) ~[na:1.8.0_181]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[na:1.8.0_181]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[na:1.8.0_181]
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-all-4.1.22.Final.jar:4.1.22.Final]
        at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_181]