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From "Alex Rudyy (Jira)" <j...@apache.org>
Subject [jira] [Created] (QPID-8366) [Broker-J] The loss of BDB HA majority on invocation of house keeping operations can crash the broker
Date Tue, 01 Oct 2019 08:02:00 GMT
Alex Rudyy created QPID-8366:
--------------------------------

             Summary: [Broker-J] The loss of BDB HA majority on invocation of house keeping
operations can crash the broker
                 Key: QPID-8366
                 URL: https://issues.apache.org/jira/browse/QPID-8366
             Project: Qpid
          Issue Type: Task
          Components: Broker-J
    Affects Versions: qpid-java-broker-7.1.4, qpid-java-broker-7.1.3, qpid-java-broker-7.0.8,
qpid-java-broker-7.1.2, qpid-java-broker-7.1.1, qpid-java-broker-7.0.7, qpid-java-broker-7.0.6,
qpid-java-broker-7.0.5, qpid-java-broker-7.0.4, qpid-java-broker-7.1.0
            Reporter: Alex Rudyy


The {{ConnectionScopedRuntimeException}} thrown from {{VirtualHost}} {{House Keeping}} thread
on invocation of {{MessageStore}} operations like {{checkMessageStatus}} can crash the broker.
An example of such exception stack trace  (from Qpid Broker version 7.0.6) is provided below:
{noformat}
2019-09-27 07:53:38,168 ERROR [virtualhost-test-pool-1] (o.a.q.s.Main) - Uncaught exception,
shutting down.
org.apache.qpid.server.util.ConnectionScopedRuntimeException: Required number of nodes not
reachable
        at org.apache.qpid.server.store.berkeleydb.replication.ReplicatedEnvironmentFacade.handleDatabaseException(ReplicatedEnvironmentFacade.java:495)
        at org.apache.qpid.server.store.berkeleydb.replication.ReplicatedEnvironmentFacade.commit(ReplicatedEnvironmentFacade.java:332)
        at org.apache.qpid.server.store.berkeleydb.AbstractBDBMessageStore.removeMessage(AbstractBDBMessageStore.java:288)
        at org.apache.qpid.server.store.berkeleydb.AbstractBDBMessageStore$StoredBDBMessage.remove(AbstractBDBMessageStore.java:1090)
        at org.apache.qpid.server.message.AbstractServerMessageImpl.decrementReference(AbstractServerMessageImpl.java:118)
        at org.apache.qpid.server.message.AbstractServerMessageImpl.access$500(AbstractServerMessageImpl.java:37)
        at org.apache.qpid.server.message.AbstractServerMessageImpl$Reference.release(AbstractServerMessageImpl.java:309)
        at org.apache.qpid.server.queue.QueueEntryImpl.dispose(QueueEntryImpl.java:557)
        at org.apache.qpid.server.queue.QueueEntryImpl.delete(QueueEntryImpl.java:572)
        at org.apache.qpid.server.queue.AbstractQueue$11.postCommit(AbstractQueue.java:1729)
        at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:92)
        at org.apache.qpid.server.queue.AbstractQueue.dequeueEntry(AbstractQueue.java:1722)
        at org.apache.qpid.server.queue.AbstractQueue.dequeueEntry(AbstractQueue.java:1717)
        at org.apache.qpid.server.queue.AbstractQueue.deleteEntry(AbstractQueue.java:1761)
        at org.apache.qpid.server.queue.AbstractQueue.checkMessageStatus(AbstractQueue.java:2165)
        at org.apache.qpid.server.virtualhost.AbstractVirtualHost$VirtualHostHouseKeepingTask.execute(AbstractVirtualHost.java:1965)
        at org.apache.qpid.server.virtualhost.HouseKeepingTask$1.run(HouseKeepingTask.java:56)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.apache.qpid.server.virtualhost.HouseKeepingTask.run(HouseKeepingTask.java:51)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.qpid.server.bytebuffer.QpidByteBufferFactory.lambda$null$0(QpidByteBufferFactory.java:464)
        at java.lang.Thread.run(Thread.java:748)
Caused by: com.sleepycat.je.rep.InsufficientAcksException: (JE 7.4.5) Transaction: -3459038252
 VLSN: 10,380,435,448, initiated at: 07:53:20.  Insufficient acks for policy:SIMPLE_MAJORITY.
Need replica acks: 2. Missing replica acks: 2. Timeout: 15000ms. FeederState=acc3_2(3)[MASTER]
Current feeds:
 acc3_1: feederVLSN=10,380,435,456 replicaTxnEndVLSN=10,380,435,396
 acc3: feederVLSN=10,380,435,456 replicaTxnEndVLSN=10,380,435,396

        at com.sleepycat.je.rep.impl.node.DurabilityQuorum.ensureSufficientAcks(DurabilityQuorum.java:205)
        at com.sleepycat.je.rep.stream.FeederTxns.awaitReplicaAcks(FeederTxns.java:189)
        at com.sleepycat.je.rep.impl.RepImpl.postLogCommitHookInternal(RepImpl.java:1426)
        at com.sleepycat.je.rep.impl.RepImpl.postLogCommitHook(RepImpl.java:1385)
        at com.sleepycat.je.rep.txn.MasterTxn.postLogCommitHook(MasterTxn.java:228)
        at com.sleepycat.je.txn.Txn.commit(Txn.java:772)
        at com.sleepycat.je.Transaction.doCommit(Transaction.java:621)
        at com.sleepycat.je.Transaction.commit(Transaction.java:401)
        at org.apache.qpid.server.store.berkeleydb.replication.ReplicatedEnvironmentFacade.commit(ReplicatedEnvironmentFacade.java:328)
        ... 25 common frames omitted

{noformat}

The issue reported with the stack trace above occurred when BDB HA {{VirtualHost}} was trying
to delete an expired message, but its BDB HA group lost the majority when the  {{VirtualHost}}
tried to commit a BDB HA transaction for message deletion operation. The majority loss is
communicated as {{ConnectionScopeRuntimeException}} to the caller. It seems we need to catch
and handle {{ConnectionScopeRuntimeException}}  in House Keeping operations.



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