[JBoss JIRA] (ISPN-4840) LockControlCommand timeouts can cause orphaned locks
by RH Bugzilla Integration (JIRA)
[ https://issues.jboss.org/browse/ISPN-4840?page=com.atlassian.jira.plugin.... ]
RH Bugzilla Integration commented on ISPN-4840:
-----------------------------------------------
Dan Berindei <dberinde(a)redhat.com> changed the Status of [bug 1160638|https://bugzilla.redhat.com/show_bug.cgi?id=1160638] from NEW to POST
> LockControlCommand timeouts can cause orphaned locks
> ----------------------------------------------------
>
> Key: ISPN-4840
> URL: https://issues.jboss.org/browse/ISPN-4840
> Project: Infinispan
> Issue Type: Bug
> Components: Core, Transactions
> Affects Versions: 7.0.0.CR1
> Reporter: Erik Salter
> Assignee: Dan Berindei
> Fix For: 7.0.0.Final
>
>
> If an originator times out on sending a pessimistic LockControlCommand, the receiver may still get the message. In this case, the originator will send a TxCompletionCommand. Because of this, the receiver will remove the registered remote transaction from its transaction table. If, however, another thread is processing the remote LCC command, it could acquire the lock(s) after the referencing remoteTx is removed. Thus, the affected keys will remain locked indefinitely.
> A simple solution would be to add a check to see if there's a remote transaction when the LCC thread verifies the remote transaction. This would be in addition to checking if the transaction is completed.
> See the following TRACE messages:
> -- Local TX created
> 2014-10-10 11:27:28,899 TRACE [org.infinispan.transaction.TransactionTable] (OOB-1353,session-resource-cluster,240-east-dht2.comcast.net-46326(CMC-Denver-CO)) Created a new local transaction: LocalTransaction{remoteLockedNodes=null, isMarkedForRollback=false, lockedKeys=null, backupKeyLocks=null, isFromStateTransfer=false} globalTx=GlobalTransaction:<240-east-dht2.comcast.net-46326(CMC-Denver-CO)>:859804:local, topologyId=64, age(ms)=0
> -- Remote TX created
> 2014-10-10 11:27:28,525 TRACE [org.infinispan.transaction.TransactionTable] (OOB-2850,session-resource-cluster,240-west-dht2.comcast.net-30190(CH2-Chicago-IL)) Created and registered remote transaction RemoteTransaction{modifications=[], lookedUpEntries={}, lockedKeys=null, backupKeyLocks=null, missingLookedUpEntries=false, isMarkedForRollback=false} globalTx=GlobalTransaction:<240-east-dht2.comcast.net-46326(CMC-Denver-CO)>:859804:remote, topologyId=63, age(ms)=0
> -- Originator times out on LCC
> 2014-10-10 11:27:36,902 WARN [org.infinispan.remoting.rpc.RpcManagerImpl] (OOB-1353,session-resource-cluster,240-east-dht2.comcast.net-46326(CMC-Denver-CO)) ISPN000071: Caught exception when handling command LockControlCommand{cache=eigAllocation, keys=[EdgeResourceCacheKey[edgeDeviceId=2878,resourceId=11130]], flags=null, unlock=false}
> org.infinispan.CacheException: org.jgroups.TimeoutException: timeout sending message to 240-west-dht2.comcast.net-30190(CH2-Chicago-IL)
> at org.infinispan.util.Util.rewrapAsCacheException(Util.java:542)
> at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.invokeRemoteCommand(CommandAwareRpcDispatcher.java:188)
> ...
> at org.infinispan.interceptors.distribution.TxDistributionInterceptor.visitLockControlCommand(TxDistributionInterceptor.java:204)
> at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:131)
> at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:120)
> at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:134)
> at org.infinispan.commands.AbstractVisitor.visitLockControlCommand(AbstractVisitor.java:177)
> at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:131)
> at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:120)
> at org.infinispan.interceptors.locking.PessimisticLockingInterceptor.visitLockControlCommand(PessimisticLockingInterceptor.java:235)
> at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:131)
> at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:120)
> at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:134)
> at org.infinispan.commands.AbstractVisitor.visitLockControlCommand(AbstractVisitor.java:177)
> at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:131)
> at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:120)
> at org.infinispan.interceptors.TxInterceptor.invokeNextInterceptorAndVerifyTransaction(TxInterceptor.java:116)
> ...
> at org.infinispan.CacheImpl.lock(CacheImpl.java:565)
> at org.infinispan.CacheImpl.lock(CacheImpl.java:548)
> ...
> Caused by: org.jgroups.TimeoutException: timeout sending message to 240-west-dht2.comcast.net-30190(CH2-Chicago-IL)
> at org.jgroups.blocks.MessageDispatcher.sendMessage(MessageDispatcher.java:390)
> at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.processSingleCall(CommandAwareRpcDispatcher.java:303)
> at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.invokeRemoteCommand(CommandAwareRpcDispatcher.java:181)
> ... 91 more
> 2014-10-10 11:27:36,936 TRACE [org.infinispan.interceptors.TxInterceptor] (OOB-1353,session-resource-cluster,240-east-dht2.comcast.net-46326(CMC-Denver-CO)) invokeNextInterceptorAndVerifyTransaction :: originatorMissing=false, alreadyCompleted=false
> 2014-10-10 11:27:36,937 ERROR [org.infinispan.interceptors.InvocationContextInterceptor] (OOB-1353,session-resource-cluster,240-east-dht2.comcast.net-46326(CMC-Denver-CO)) ISPN000136: Execution error
> org.infinispan.CacheException: org.jgroups.TimeoutException: timeout sending message to 240-west-dht2.comcast.net-30190(CH2-Chicago-IL)
> at org.infinispan.util.Util.rewrapAsCacheException(Util.java:542)
> ...
> -- Same stack trace
> -- Remote TX removed -- must be from TxCompletionMessage since isMarkedForRollback == false
> 2014-10-10 11:27:36,530 TRACE [org.infinispan.transaction.TransactionTable] (OOB-2963,session-resource-cluster,240-west-dht2.comcast.net-30190(CH2-Chicago-IL)) Removed remote transaction GlobalTransaction:<240-east-dht2.comcast.net-46326(CMC-Denver-CO)>:859804:local ? RemoteTransaction{modifications=[], lookedUpEntries={}, lockedKeys=null, backupKeyLocks=null, missingLookedUpEntries=false, isMarkedForRollback=false} globalTx=GlobalTransaction:<240-east-dht2.comcast.net-46326(CMC-Denver-CO)>:859804:remote, topologyId=63, age(ms)=8004
> 2014-10-10 11:27:36,530 TRACE [org.infinispan.transaction.TransactionTable] (OOB-2963,session-resource-cluster,240-west-dht2.comcast.net-30190(CH2-Chicago-IL)) Removed RemoteTransaction{modifications=[], lookedUpEntries={}, lockedKeys=null, backupKeyLocks=null, missingLookedUpEntries=false, isMarkedForRollback=false} globalTx=GlobalTransaction:<240-east-dht2.comcast.net-46326(CMC-Denver-CO)>:859804:remote, topologyId=63, age(ms)=8004 from transaction table.
> -- Local TX removed
> 2014-10-10 11:27:36,937 TRACE [org.infinispan.transaction.TransactionTable] (OOB-1353,session-resource-cluster,240-east-dht2.comcast.net-46326(CMC-Denver-CO)) Removed LocalTransaction{remoteLockedNodes=[240-east-dht2.comcast.net-46326(CMC-Denver-CO), 240-west-dht2.comcast.net-30190(CH2-Chicago-IL)], isMarkedForRollback=false, lockedKeys=null, backupKeyLocks=null, isFromStateTransfer=false} globalTx=GlobalTransaction:<240-east-dht2.comcast.net-46326(CMC-Denver-CO)>:859804:local, topologyId=64, age(ms)=8038 from transaction table.
> -- Lock acquisition completes!
> 2014-10-10 11:27:39,195 TRACE [org.infinispan.util.concurrent.locks.LockManagerImpl] (OOB-2850,session-resource-cluster,240-west-dht2.comcast.net-30190(CH2-Chicago-IL)) Attempting to lock EdgeResourceCacheKey[edgeDeviceId=2878,resourceId=11130] with acquisition timeout of 5000 millis
> 2014-10-10 11:27:39,198 TRACE [org.infinispan.util.concurrent.locks.LockManagerImpl] (OOB-2850,session-resource-cluster,240-west-dht2.comcast.net-30190(CH2-Chicago-IL)) Successfully acquired lock EdgeResourceCacheKey[edgeDeviceId=2878,resourceId=11130]!
> 2014-10-10 11:27:39,202 TRACE [org.infinispan.transaction.TransactionTable] (OOB-2850,session-resource-cluster,240-west-dht2.comcast.net-30190(CH2-Chicago-IL)) Transaction=GlobalTransaction:<240-east-dht2.comcast.net-46326(CMC-Denver-CO)>:859804:remote, nodeMaxPrunedTxId=858439
> -- Not in completion map since transaction was removed without commit or rollback. Lock never releases
> 2014-10-10 11:27:39,203 TRACE [org.infinispan.interceptors.TxInterceptor] (OOB-2850,session-resource-cluster,240-west-dht2.comcast.net-30190(CH2-Chicago-IL)) invokeNextInterceptorAndVerifyTransaction :: originatorMissing=false, alreadyCompleted=false
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[JBoss JIRA] (ISPN-4872) During state transfer, a pessimistic transaction can fail due to a ClusteredGetCommand forcing a lock command
by RH Bugzilla Integration (JIRA)
[ https://issues.jboss.org/browse/ISPN-4872?page=com.atlassian.jira.plugin.... ]
RH Bugzilla Integration commented on ISPN-4872:
-----------------------------------------------
Dan Berindei <dberinde(a)redhat.com> changed the Status of [bug 1160637|https://bugzilla.redhat.com/show_bug.cgi?id=1160637] from NEW to POST
> During state transfer, a pessimistic transaction can fail due to a ClusteredGetCommand forcing a lock command
> -------------------------------------------------------------------------------------------------------------
>
> Key: ISPN-4872
> URL: https://issues.jboss.org/browse/ISPN-4872
> Project: Infinispan
> Issue Type: Bug
> Components: Core
> Affects Versions: 5.2.7.Final, 6.0.2.Final, 7.0.0.CR2
> Reporter: Erik Salter
> Assignee: Dan Berindei
> Fix For: 7.0.0.Final
>
>
> This is a strange one:
> A pessimistic transaction started on the primary owner during state transfer can fail because a backup owner issues a ClusteredGetCommand to the primary while processing the write command. This can happen if the backup needs to perform a remote get (due to a DELTA_WRITE, conditional, or reliable return values). In this case, it's a DELTA_WRITE.
> In this chain of events, state transfer is ongoing, and the union CH is (east-dht5, west-dht5, east-dht6) In this case, the pessimistic transaction originated on east-dht5 must be invoked on west-dht5 and east-dht6:
> {code}
> 2014-10-21 02:15:01,309 TRACE [org.infinispan.transaction.TransactionTable] (OOB-1713,session-resource-cluster,240-east-dht5.comcast.net-26106(CMC-Denver-CO)) Created a new local transaction: LocalXaTransaction{xid=null} LocalTransaction{remoteLockedNodes=null, isMarkedForRollback=false, lockedKeys=null, backupKeyLocks=null, isFromStateTransfer=false} globalTx=GlobalTransaction:<240-east-dht5.comcast.net-26106(CMC-Denver-CO)>:1575124:local, topologyId=33, age(ms)=0
> 2014-10-21 02:15:01,309 TRACE [org.infinispan.util.concurrent.locks.containers.OwnableReentrantPerEntryLockContainer] (OOB-1713,session-resource-cluster,240-east-dht5.comcast.net-26106(CMC-Denver-CO)) Creating and acquiring new lock instance for key EdgeResourceCacheKey[edgeDeviceId=4211,resourceId=431831]
> 2014-10-21 02:15:01,345 TRACE [org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher] (OOB-1713,session-resource-cluster,240-east-dht5.comcast.net-26106(CMC-Denver-CO)) Replication task sending PrepareCommand {modifications=[PutKeyValueCommand{key=EdgeResourceCacheKey[edgeDeviceId=4211,resourceId=431831], value=QamResource [qamId=431831, currentBandwidth=3750000, maxBandwidth=38810000, maxPrograms=255, currentPrograms=1], flags=[SKIP_REMOTE_LOOKUP, DELTA_WRITE], putIfAbsent=false, lifespanMillis=-1, maxIdleTimeMillis=-1, successful=true, ignorePreviousValue=false}], onePhaseCommit=true, gtx=GlobalTransaction:<240-east-dht5.comcast.net-26106(CMC-Denver-CO)>:1575124:local, cacheName='qamAllocation', topologyId=33} to addresses [240-west-dht5.comcast.net-35898(CH2-Chicago-IL), 240-east-dht6.comcast.net-47049(CMC-Denver-CO)] with response mode GET_ALL
> {code}
> Let's examine east-dht6. It gets the write request. It needs to perform a remote get to pull the full key context, since it receives only the delta.
> {code}
> 2014-10-21 02:15:01,362 TRACE [org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher] (OOB-2149,session-resource-cluster,240-east-dht6.comcast.net-47049(CMC-Denver-CO)) Attempting to execute command: PrepareCommand {modifications=[PutKeyValueCommand{key=EdgeResourceCacheKey[edgeDeviceId=4211,resourceId=431831], value=QamResourceDelta [qamId=431831, basePort=2049, currentBandwidth=3750000, maxBandwidth=38810000, maxPrograms=255, currentPrograms=1, baseProgramNumber=1, portStep=1, program=Program [portNumber=2053, programNumber=5, status=UNUSED, sessionToken=, lastUpdatedTime=1413872101310, bandwidth=0, inputId=-1]], flags=[SKIP_REMOTE_LOOKUP, DELTA_WRITE], putIfAbsent=false, lifespanMillis=-1, maxIdleTimeMillis=-1, successful=true, ignorePreviousValue=false}], onePhaseCommit=true, gtx=GlobalTransaction:<240-east-dht5.comcast.net-26106(CMC-Denver-CO)>:1575124:local, cacheName='qamAllocation', topologyId=33} [sender=240-east-dht5.comcast.net-26106(CMC-Denver-CO)]
> ...
> 2014-10-21 02:15:01,362 TRACE [org.infinispan.transaction.TransactionTable] (OOB-2149,session-resource-cluster,240-east-dht6.comcast.net-47049(CMC-Denver-CO)) Created and registered remote transaction RemoteTransaction{modifications=...
> globalTx=GlobalTransaction:<240-east-dht5.comcast.net-26106(CMC-Denver-CO)>:1575124:remote, topologyId=33, age(ms)=0
> 2014-10-21 02:15:01,362 TRACE [org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher] (OOB-2149,session-resource-cluster,240-east-dht6.comcast.net-47049(CMC-Denver-CO)) Replication task sending ClusteredGetCommand{key=EdgeResourceCacheKey[edgeDeviceId=4211,resourceId=431831], flags=[SKIP_REMOTE_LOOKUP, DELTA_WRITE]} to addresses [240-east-dht5.comcast.net-26106(CMC-Denver-CO), 240-west-dht5.comcast.net-35898(CH2-Chicago-IL)] with response mode GET_FIRST
> {code}
> east-dht5 receives the ClusteredGetCommand request. Because TxDistributionInterceptor::line 325 is true, the acquireRemoteLock flag is set to true.
> {code}
> boolean acquireRemoteLock = false;
> if (ctx.isInTxScope()) {
> TxInvocationContext txContext = (TxInvocationContext) ctx;
> acquireRemoteLock = isWrite && isPessimisticCache && !txContext.getAffectedKeys().contains(key);
> }
> {code}
> Thus, when east-dht5 runs the ClusteredGetCommand. it will create and invoke a LockControlCommand. Because the LCC is created inline, it will not have its origin set. But the LCC will create a RemoteTxInvocationContext. When the LCC runs through the interceptor chain, TxInterceptor::invokeNextInterceptorAndVerifyTransaction will check the originator (because of the remote context). When it doesn't find it, it will force a rollback.
> {code}
> 2014-10-21 02:15:01,347 TRACE [org.infinispan.remoting.InboundInvocationHandlerImpl] (OOB-1721,session-resource-cluster,240-east-dht5.comcast.net-26106(CMC-Denver-CO)) Calling perform() on ClusteredGetCommand{key=EdgeResourceCacheKey[edgeDeviceId=4211,resourceId=431831], flags=[SKIP_REMOTE_LOOKUP, DELTA_WRITE]}
> 2014-10-21 02:15:01,347 TRACE [org.infinispan.transaction.TransactionTable] (OOB-1721,session-resource-cluster,240-east-dht5.comcast.net-26106(CMC-Denver-CO)) Created and registered remote transaction RemoteTransaction{modifications=[], lookedUpEntries={}, lockedKeys=null, backupKeyLocks=null, missingLookedUpEntries=false, isMarkedForRollback=false} globalTx=GlobalTransaction:<240-east-dht5.comcast.net-26106(CMC-Denver-CO)>:1575124:local, topologyId=33, age(ms)=0
> 2014-10-21 02:15:01,347 TRACE [org.infinispan.statetransfer.StateTransferInterceptor] (OOB-1721,session-resource-cluster,240-east-dht5.comcast.net-26106(CMC-Denver-CO)) handleTopologyAffectedCommand for command LockControlCommand{cache=qamAllocation, keys=[EdgeResourceCacheKey[edgeDeviceId=4211,resourceId=431831]], flags=[SKIP_REMOTE_LOOKUP, DELTA_WRITE], unlock=false}
> 2014-10-21 02:15:01,347 TRACE [org.infinispan.interceptors.locking.PessimisticLockingInterceptor] (OOB-1721,session-resource-cluster,240-east-dht5.comcast.net-26106(CMC-Denver-CO)) Locking key EdgeResourceCacheKey[edgeDeviceId=4211,resourceId=431831], no need to check for pending locks.
> 2014-10-21 02:15:01,347 TRACE [org.infinispan.interceptors.TxInterceptor] (OOB-1721,session-resource-cluster,240-east-dht5.comcast.net-26106(CMC-Denver-CO)) invokeNextInterceptorAndVerifyTransaction :: originatorMissing=true, alreadyCompleted=false
> 2014-10-21 02:15:01,347 TRACE [org.infinispan.interceptors.TxInterceptor] (OOB-1721,session-resource-cluster,240-east-dht5.comcast.net-26106(CMC-Denver-CO)) Rolling back remote transaction GlobalTransaction:<240-east-dht5.comcast.net-26106(CMC-Denver-CO)>:1575124:local because either already completed(false) or originator(null) no longer in the cluster(true).
>
> // ROLLBACK HAPPENS HERE
> {code}
> When the transaction attempts to commit, it fails due to the spurious rollback. For instance:
> {code}
> 2014-10-21 02:15:01,384 WARN [org.infinispan.remoting.rpc.RpcManagerImpl] (OOB-1713,session-resource-cluster,240-east-dht5.comcast.net-26106(CMC-Denver-CO)) ISPN000071: Caught exception when handling command PrepareCommand {modifications=[PutKeyValueCommand{key=EdgeResourceCacheKey[edgeDeviceId=4211,resourceId=431831], value=QamResource [qamId=431831, currentBandwidth=3750000, maxBandwidth=38810000, maxPrograms=255, currentPrograms=1], flags=[SKIP_REMOTE_LOOKUP, DELTA_WRITE], putIfAbsent=false, lifespanMillis=-1, maxIdleTimeMillis=-1, successful=true, ignorePreviousValue=false}], onePhaseCommit=true, gtx=GlobalTransaction:<240-east-dht5.comcast.net-26106(CMC-Denver-CO)>:1575124:local, cacheName='qamAllocation', topologyId=33}
> org.infinispan.remoting.RemoteException: ISPN000217: Received exception from 240-west-dht5.comcast.net-35898(CH2-Chicago-IL), see cause for remote stack trace
> ...
> at org.infinispan.commands.tx.PrepareCommand.acceptVisitor(PrepareCommand.java:124)
> at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:343)
> at org.infinispan.transaction.TransactionCoordinator.commit(TransactionCoordinator.java:175)
> at org.infinispan.transaction.xa.TransactionXaAdapter.commit(TransactionXaAdapter.java:122)
> ...
> com.arjuna.ats.internal.jta.resources.arjunacore.XAResourceRecord.topLevelOnePhaseCommit(XAResourceRecord.java:636)
> at com.arjuna.ats.arjuna.coordinator.BasicAction.onePhaseCommit(BasicAction.java:2619)
> at com.arjuna.ats.arjuna.coordinator.BasicAction.End(BasicAction.java:1779)
> at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:88)
> at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177)
> Caused by: org.infinispan.transaction.xa.InvalidTransactionException: This remote transaction GlobalTransaction:<240-east-dht5.comcast.net-26106(CMC-Denver-CO)>:1575124:local is already rolled back
> at org.infinispan.transaction.RemoteTransaction.checkIfRolledBack(RemoteTransaction.java:137)
> at org.infinispan.transaction.RemoteTransaction.putLookedUpEntry(RemoteTransaction.java:73)
> at org.infinispan.context.impl.RemoteTxInvocationContext.putLookedUpEntry(RemoteTxInvocationContext.java:99)
> at org.infinispan.container.EntryFactoryImpl.wrapInternalCacheEntryForPut(EntryFactoryImpl.java:242)
> at org.infinispan.container.EntryFactoryImpl.wrapEntryForPut(EntryFactoryImpl.java:166)
> ...
> {code}
> So it looks like there's a couple ways to handle this. One would be to only acquire a remote lock in TxDistributionInterceptor if the current node was the originator. Another -- possibly less intrusive -- would be to set the origin of the invoked LCC command to that of the ClusteredGetCommand. The former should be preferable, but this code tends to be a bit labyrinthine with the various pessimistic use cases out there.
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[JBoss JIRA] (ISPN-4900) Split-brain: cancelled ST results in missing data
by RH Bugzilla Integration (JIRA)
[ https://issues.jboss.org/browse/ISPN-4900?page=com.atlassian.jira.plugin.... ]
RH Bugzilla Integration commented on ISPN-4900:
-----------------------------------------------
Dan Berindei <dberinde(a)redhat.com> changed the Status of [bug 1158535|https://bugzilla.redhat.com/show_bug.cgi?id=1158535] from NEW to POST
> Split-brain: cancelled ST results in missing data
> -------------------------------------------------
>
> Key: ISPN-4900
> URL: https://issues.jboss.org/browse/ISPN-4900
> Project: Infinispan
> Issue Type: Bug
> Components: State Transfer
> Reporter: Radim Vansa
> Assignee: Dan Berindei
> Priority: Critical
> Fix For: 7.0.0.Final
>
> Attachments: log.txt
>
>
> 1. Cluster [A, B, C, D], in CH 1 segment X owned by [D, C]
> 2. Split brain [A, B], [C, D]: A and B detects that D is missing, therefore they get view [A, B, C] and start rebalancing, in CH 2 segment X is owned by [C, B]
> 3. A and B get new view [A, B] (C is missing) and state transfer of X is cancelled, nodes enter degraded mode.
> 4. Split brain is fixed, all nodes find each other and merge - B starts to be AVAILABLE, but still does not have data for X
> 5. Subsequent requests on B return null upon cache.get()
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[JBoss JIRA] (ISPN-4848) Offer way to implement includeCurrentState based on indexed query
by RH Bugzilla Integration (JIRA)
[ https://issues.jboss.org/browse/ISPN-4848?page=com.atlassian.jira.plugin.... ]
RH Bugzilla Integration commented on ISPN-4848:
-----------------------------------------------
Dan Berindei <dberinde(a)redhat.com> changed the Status of [bug 1160635|https://bugzilla.redhat.com/show_bug.cgi?id=1160635] from NEW to POST
> Offer way to implement includeCurrentState based on indexed query
> -----------------------------------------------------------------
>
> Key: ISPN-4848
> URL: https://issues.jboss.org/browse/ISPN-4848
> Project: Infinispan
> Issue Type: Feature Request
> Reporter: Emmanuel Bernard
> Assignee: Mircea Markus
>
> Based on the infinispan-dev mailing list discussion from September 2014 titled
> 'Feedback and requests on clustered and remote listeners'.
> Loading the whole state of the data grid to then filter / convert them can be costly especially if data has been passivated.
> An alternative could be offered that would delegate the includeCurrentState filtering with a global indexed query. That query would need to be provided by the user. While the query is run, the list of change events matching should be piled up and released once the query has be run and the converted events are send to the clustered listener.
> Maybe that should be only done for "continuous" queries as we could use the query for both the initial and continuous side of the query transparently.
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