[JBoss JIRA] (ISPN-5513) State Transfer can miss entries that are concurrently activated
by Galder Zamarreño (JIRA)
[ https://issues.jboss.org/browse/ISPN-5513?page=com.atlassian.jira.plugin.... ]
Galder Zamarreño updated ISPN-5513:
-----------------------------------
Fix Version/s: 9.0.0.Beta3
(was: 9.0.0.Beta2)
> State Transfer can miss entries that are concurrently activated
> ---------------------------------------------------------------
>
> Key: ISPN-5513
> URL: https://issues.jboss.org/browse/ISPN-5513
> Project: Infinispan
> Issue Type: Bug
> Components: State Transfer
> Affects Versions: 8.0.0.Alpha1
> Reporter: William Burns
> Fix For: 9.0.0.Beta3
>
>
> Currently the OutboundTransferTask iterates upon the data container and then runs process for the state loader. However if an entry is activated during or after the data container iteration it is possible this entry is then not seen and subsequently is not present in the store when it is processed.
> EntryRetriever had this same issue and it was required to register a cache listener to listen for activations and then replay the data after finishing with the store.
> This can cause duplicate values as well, however replacing the same exact value is fine and if a non ST write occurs the state is ignored anyways.
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[JBoss JIRA] (ISPN-5506) Dist/ReplEmbeddedRestHotRodTest failing randomly with "java.net.SocketException: Socket closed"
by Galder Zamarreño (JIRA)
[ https://issues.jboss.org/browse/ISPN-5506?page=com.atlassian.jira.plugin.... ]
Galder Zamarreño updated ISPN-5506:
-----------------------------------
Fix Version/s: 9.0.0.Beta3
(was: 9.0.0.Beta2)
> Dist/ReplEmbeddedRestHotRodTest failing randomly with "java.net.SocketException: Socket closed"
> -----------------------------------------------------------------------------------------------
>
> Key: ISPN-5506
> URL: https://issues.jboss.org/browse/ISPN-5506
> Project: Infinispan
> Issue Type: Bug
> Components: Remote Protocols
> Affects Versions: 7.2.1.Final, 8.0.0.Alpha1
> Reporter: Galder Zamarreño
> Assignee: Galder Zamarreño
> Fix For: 9.0.0.Beta3
>
> Attachments: infinispan_5506.tgz
>
>
> {code}
> testEmbeddedPutRestHotRodGet(org.infinispan.it.compatibility.DistEmbeddedRestHotRodTest) Time elapsed: 0.002 sec <<< FAILURE!
> java.net.SocketException: Socket closed
> at java.net.PlainSocketImpl.socketConnect(Native Method)
> at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
> at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
> at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
> at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
> at java.net.Socket.connect(Socket.java:589)
> at java.net.Socket.connect(Socket.java:538)
> at java.net.Socket.<init>(Socket.java:434)
> at java.net.Socket.<init>(Socket.java:286)
> at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:80)
> at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:122)
> at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
> at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
> at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
> at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
> at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
> at org.infinispan.it.compatibility.ReplEmbeddedRestHotRodTest.testEmbeddedPutRestHotRodGet(ReplEmbeddedRestHotRodTest.java:80)
> {code}
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[JBoss JIRA] (ISPN-5498) ClientClusterFailoverEventsTest.testEventReplayWithAndWithoutStateAfterFailover random failures
by Galder Zamarreño (JIRA)
[ https://issues.jboss.org/browse/ISPN-5498?page=com.atlassian.jira.plugin.... ]
Galder Zamarreño updated ISPN-5498:
-----------------------------------
Fix Version/s: 9.0.0.Beta3
(was: 9.0.0.Beta2)
> ClientClusterFailoverEventsTest.testEventReplayWithAndWithoutStateAfterFailover random failures
> -----------------------------------------------------------------------------------------------
>
> Key: ISPN-5498
> URL: https://issues.jboss.org/browse/ISPN-5498
> Project: Infinispan
> Issue Type: Bug
> Components: Test Suite - Server
> Affects Versions: 7.2.1.Final
> Reporter: Dan Berindei
> Priority: Blocker
> Labels: testsuite_stability
> Fix For: 9.0.0.Beta3
>
>
> It appears the cluster event notifier wants to send some events to a node that no longer exists, and the exception is propagated all the way to the HR client:
> {noformat}
> 12:04:03,088 ERROR (HotRodServerWorker-78-1:) [InvocationContextInterceptor] ISPN000136: Execution errorjava.lang.IllegalArgumentException: Target node ClientClusterFailoverEventsTest-NodeA-33510 is not a cluster member, members are [ClientClusterFailoverEventsTest-NodeB-14182]
> at org.infinispan.distexec.DefaultExecutorService.submit(DefaultExecutorService.java:414)
> at org.infinispan.distexec.DefaultExecutorService.submit(DefaultExecutorService.java:403)
> at org.infinispan.distexec.DistributedExecutionCompletionService.submit(DistributedExecutionCompletionService.java:178)
> at org.infinispan.notifications.cachelistener.cluster.impl.BatchingClusterEventManagerImpl$UnicastEventContext.sendToTargets(BatchingClusterEventManagerImpl.java:97)
> at org.infinispan.notifications.cachelistener.cluster.impl.BatchingClusterEventManagerImpl.sendEvents(BatchingClusterEventManagerImpl.java:50)
> at org.infinispan.notifications.cachelistener.CacheNotifierImpl.notifyCacheEntryCreated(CacheNotifierImpl.java:292)
> at org.infinispan.interceptors.locking.ClusteringDependentLogic$AbstractClusteringDependentLogic.notifyCommitEntry(ClusteringDependentLogic.java:138)
> at org.infinispan.interceptors.locking.ClusteringDependentLogic$DistributionLogic.commitSingleEntry(ClusteringDependentLogic.java:493)
> at org.infinispan.interceptors.locking.ClusteringDependentLogic$AbstractClusteringDependentLogic.commitEntry(ClusteringDependentLogic.java:108)
> at org.infinispan.interceptors.EntryWrappingInterceptor.commitContextEntry(EntryWrappingInterceptor.java:367)
> at org.infinispan.interceptors.EntryWrappingInterceptor.commitEntryIfNeeded(EntryWrappingInterceptor.java:545)
> at org.infinispan.interceptors.EntryWrappingInterceptor.commitContextEntries(EntryWrappingInterceptor.java:344)
> at org.infinispan.interceptors.EntryWrappingInterceptor.invokeNextAndApplyChanges(EntryWrappingInterceptor.java:418)
> at org.infinispan.interceptors.EntryWrappingInterceptor.setSkipRemoteGetsAndInvokeNextForDataCommand(EntryWrappingInterceptor.java:449)
> at org.infinispan.interceptors.EntryWrappingInterceptor.visitPutKeyValueCommand(EntryWrappingInterceptor.java:195)
> at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:71)
> at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:97)
> at org.infinispan.interceptors.locking.AbstractLockingInterceptor.visitNonTxDataWriteCommand(AbstractLockingInterceptor.java:88)
> at org.infinispan.interceptors.locking.NonTransactionalLockingInterceptor.visitDataWriteCommand(NonTransactionalLockingInterceptor.java:40)
> at org.infinispan.interceptors.locking.AbstractLockingInterceptor.visitPutKeyValueCommand(AbstractLockingInterceptor.java:55)
> at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:71)
> at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:97)
> at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:111)
> at org.infinispan.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:44)
> at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:71)
> at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:97)
> at org.infinispan.statetransfer.StateTransferInterceptor.handleNonTxWriteCommand(StateTransferInterceptor.java:324)
> at org.infinispan.statetransfer.StateTransferInterceptor.handleWriteCommand(StateTransferInterceptor.java:256)
> at org.infinispan.statetransfer.StateTransferInterceptor.visitPutKeyValueCommand(StateTransferInterceptor.java:115)
> at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:71)
> at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:97)
> at org.infinispan.interceptors.CacheMgmtInterceptor.updateStoreStatistics(CacheMgmtInterceptor.java:191)
> at org.infinispan.interceptors.CacheMgmtInterceptor.visitPutKeyValueCommand(CacheMgmtInterceptor.java:177)
> at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:71)
> at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:97)
> at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:102)
> at org.infinispan.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:71)
> at org.infinispan.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:44)
> at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:71)
> at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:336)
> at org.infinispan.cache.impl.CacheImpl.executeCommandAndCommitIfNeeded(CacheImpl.java:1617)
> at org.infinispan.cache.impl.CacheImpl.putInternal(CacheImpl.java:1097)
> at org.infinispan.cache.impl.CacheImpl.put(CacheImpl.java:1089)
> at org.infinispan.cache.impl.DecoratedCache.put(DecoratedCache.java:522)
> at org.infinispan.server.hotrod.CacheDecodeContext.put(CacheDecodeContext.scala:216)
> at org.infinispan.server.hotrod.HotRodDecoder.org$infinispan$server$hotrod$HotRodDecoder$$decodeValue(HotRodDecoder.scala:132)
> at org.infinispan.server.hotrod.HotRodDecoder$$anonfun$decode$1.apply$mcV$sp(HotRodDecoder.scala:50)
> at org.infinispan.server.hotrod.HotRodDecoder.wrapSecurity(HotRodDecoder.scala:208)
> at org.infinispan.server.hotrod.HotRodDecoder.decode(HotRodDecoder.scala:45)
> org.infinispan.client.hotrod.exceptions.HotRodClientException:Request for message id[922] returned server error (status=0x85): java.lang.IllegalArgumentException: Target node ClientClusterFailoverEventsTest-NodeA-33510 is not a cluster member, members are [ClientClusterFailoverEventsTest-NodeB-14182]
> at org.infinispan.client.hotrod.impl.protocol.Codec20.checkForErrorsInResponseStatus(Codec20.java:336)
> at org.infinispan.client.hotrod.impl.protocol.Codec20.readPartialHeader(Codec20.java:126)
> at org.infinispan.client.hotrod.impl.protocol.Codec20.readHeader(Codec20.java:112)
> at org.infinispan.client.hotrod.impl.operations.HotRodOperation.readHeaderAndValidate(HotRodOperation.java:56)
> at org.infinispan.client.hotrod.impl.operations.AbstractKeyValueOperation.sendPutOperation(AbstractKeyValueOperation.java:57)
> at org.infinispan.client.hotrod.impl.operations.PutOperation.executeOperation(PutOperation.java:31)
> at org.infinispan.client.hotrod.impl.operations.PutOperation.executeOperation(PutOperation.java:20)
> at org.infinispan.client.hotrod.impl.operations.RetryOnFailureOperation.execute(RetryOnFailureOperation.java:52)
> at org.infinispan.client.hotrod.impl.RemoteCacheImpl.put(RemoteCacheImpl.java:247)
> at org.infinispan.client.hotrod.impl.RemoteCacheSupport.put(RemoteCacheSupport.java:79)
> at org.infinispan.client.hotrod.event.ClientClusterFailoverEventsTest.testEventReplayWithAndWithoutStateAfterFailover(ClientClusterFailoverEventsTest.java:59)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:497)
> at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
> at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
> at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
> at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
> at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
> at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
> at org.testng.TestRunner.privateRun(TestRunner.java:767)
> at org.testng.TestRunner.run(TestRunner.java:617)
> at org.testng.SuiteRunner.runTest(SuiteRunner.java:348)
> at org.testng.SuiteRunner.access$000(SuiteRunner.java:38)
> at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:382)
> at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
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[JBoss JIRA] (ISPN-5572) Exposed JMX MBeans should be separate components
by Galder Zamarreño (JIRA)
[ https://issues.jboss.org/browse/ISPN-5572?page=com.atlassian.jira.plugin.... ]
Galder Zamarreño updated ISPN-5572:
-----------------------------------
Fix Version/s: 9.0.0.Beta3
(was: 9.0.0.Beta2)
> Exposed JMX MBeans should be separate components
> ------------------------------------------------
>
> Key: ISPN-5572
> URL: https://issues.jboss.org/browse/ISPN-5572
> Project: Infinispan
> Issue Type: Task
> Components: Core
> Affects Versions: 8.0.0.Alpha2, 7.2.3.Final
> Reporter: Dan Berindei
> Fix For: 9.0.0.Beta3
>
>
> We currently expose internal components as JMX MBeans, and that makes our JMX "API" very unstructured. The exposed MBeans should be separate components, and the only concern in their interfaces should be ease of use.
> One example of JMX getting in the way of refactoring is {{CacheMgmtInterceptor}}. The interceptor chain is dynamic, so it should be possible to insert the interceptor only when statistics are enabled. But because the {{statisticsEnabled}} attribute is on the interceptor itself, that becomes a lot trickier, and we had to introduce a separate configuration attribute that disables statistics permanently (ISPN-5542).
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[JBoss JIRA] (ISPN-5570) Cross-site: retry backup commands
by Galder Zamarreño (JIRA)
[ https://issues.jboss.org/browse/ISPN-5570?page=com.atlassian.jira.plugin.... ]
Galder Zamarreño updated ISPN-5570:
-----------------------------------
Fix Version/s: 9.0.0.Beta3
(was: 9.0.0.Beta2)
> Cross-site: retry backup commands
> ---------------------------------
>
> Key: ISPN-5570
> URL: https://issues.jboss.org/browse/ISPN-5570
> Project: Infinispan
> Issue Type: Bug
> Components: Core, Cross-Site Replication
> Affects Versions: 7.2.3.Final
> Reporter: Dan Berindei
> Fix For: 9.0.0.Beta3
>
>
> There are 3 phases in a backup RPC:
> 1. Sender -> Local site master: caused by the site master is shutting down or crashing, or by a network split.
> 2. Local site master -> Remote site master:
> 2.1. Local site master is no longer a site master, e.g. because it's shutting down or because it's no longer coordinator after a merge.
> 2.2. Remote site master is not longer a site master.
> 2.3. Link between local site and remote site is down.
> 3. Remote site master -> Backup targets
> Replication failures in phase 3 are handled by retrying (except for TimeoutExceptions), because {{BaseBackupReceiver}} uses regular cache methods to perform the updates.
> But replication failures in phases 1 and 2 are not handled in any way, except for causing the remote site to be taken offline after a certain number of replication failures (if backup is synchronous). We should instead retry backup RPCs when we get a {{SuspectException}} or {{UnreachableException}}, and perhaps even when we get no response (2.2?), and only stop when the timeout expires or when the backup is taken offline.
> Async backup probably needs retrying as well, and perhaps even a more sophisticated approach like I-RAC (ISPN-2634).
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[JBoss JIRA] (ISPN-5557) Core threading redesign
by Galder Zamarreño (JIRA)
[ https://issues.jboss.org/browse/ISPN-5557?page=com.atlassian.jira.plugin.... ]
Galder Zamarreño updated ISPN-5557:
-----------------------------------
Fix Version/s: 9.0.0.Beta3
(was: 9.0.0.Beta2)
> Core threading redesign
> -----------------------
>
> Key: ISPN-5557
> URL: https://issues.jboss.org/browse/ISPN-5557
> Project: Infinispan
> Issue Type: Task
> Components: Core
> Affects Versions: 7.2.2.Final
> Reporter: Dan Berindei
> Assignee: Dan Berindei
> Priority: Critical
> Fix For: 9.0.0.Beta3
>
>
> Infinispan needs a lot of threads, because everything is synchronous: locking, remote command invocations, cache writers. This causes various issues, from general context switching overhead to the thread pools getting full and causing deadlocks.
> We should redesign the core so that most blocking happens on the application threads, and the number of internal threads is kept to a minimum.
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[JBoss JIRA] (ISPN-5530) AtomicObjectFactoryTest.distributedCacheTest random failures
by Galder Zamarreño (JIRA)
[ https://issues.jboss.org/browse/ISPN-5530?page=com.atlassian.jira.plugin.... ]
Galder Zamarreño updated ISPN-5530:
-----------------------------------
Fix Version/s: 9.0.0.Beta3
(was: 9.0.0.Beta2)
> AtomicObjectFactoryTest.distributedCacheTest random failures
> ------------------------------------------------------------
>
> Key: ISPN-5530
> URL: https://issues.jboss.org/browse/ISPN-5530
> Project: Infinispan
> Issue Type: Bug
> Components: Test Suite - Core
> Affects Versions: 7.2.2.Final, 8.0.0.Alpha1
> Reporter: Dan Berindei
> Assignee: Tristan Tarrant
> Priority: Blocker
> Labels: testsuite_stability
> Fix For: 9.0.0.Beta3
>
>
> {noformat}
> java.lang.AssertionError: obtained = 999; espected = 1000 expected:<1000> but was:<999>
> at org.testng.AssertJUnit.fail(AssertJUnit.java:59)
> at org.testng.AssertJUnit.failNotEquals(AssertJUnit.java:364)
> at org.testng.AssertJUnit.assertEquals(AssertJUnit.java:80)
> at org.infinispan.atomic.AtomicObjectFactoryTest.distributedCacheTest(AtomicObjectFactoryTest.java:114)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:483)
> at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
> at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
> at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
> at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
> at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
> at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
> at org.testng.TestRunner.privateRun(TestRunner.java:767)
> at org.testng.TestRunner.run(TestRunner.java:617)
> at org.testng.SuiteRunner.runTest(SuiteRunner.java:348)
> at org.testng.SuiteRunner.access$000(SuiteRunner.java:38)
> at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:382)
> at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
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[JBoss JIRA] (ISPN-5575) Shared write-behind store can read stale entries on joiner
by Galder Zamarreño (JIRA)
[ https://issues.jboss.org/browse/ISPN-5575?page=com.atlassian.jira.plugin.... ]
Galder Zamarreño updated ISPN-5575:
-----------------------------------
Fix Version/s: 9.0.0.Beta3
(was: 9.0.0.Beta2)
> Shared write-behind store can read stale entries on joiner
> ----------------------------------------------------------
>
> Key: ISPN-5575
> URL: https://issues.jboss.org/browse/ISPN-5575
> Project: Infinispan
> Issue Type: Bug
> Components: Core, Loaders and Stores
> Affects Versions: 8.0.0.Alpha2, 7.2.3.Final
> Reporter: Dan Berindei
> Assignee: Dan Berindei
> Fix For: 9.0.0.Beta3
>
>
> The AsyncCacheWriter modification queue is not sent with state transfer when the store is shared. A joiner can then read from the shared store a stale version of entries that have updates in the modification queue but are no longer in memory (because they were either removed explicitly, or evicted).
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[JBoss JIRA] (ISPN-5574) Define high-level cache capabilities
by Galder Zamarreño (JIRA)
[ https://issues.jboss.org/browse/ISPN-5574?page=com.atlassian.jira.plugin.... ]
Galder Zamarreño updated ISPN-5574:
-----------------------------------
Fix Version/s: 9.0.0.Beta3
(was: 9.0.0.Beta2)
> Define high-level cache capabilities
> ------------------------------------
>
> Key: ISPN-5574
> URL: https://issues.jboss.org/browse/ISPN-5574
> Project: Infinispan
> Issue Type: Feature Request
> Components: Configuration, Core
> Affects Versions: 7.2.3.Final
> Reporter: Dan Berindei
> Priority: Minor
> Fix For: 9.0.0.Beta3
>
>
> Infinispan's configuration is very flexible, and it's sometimes hard to figure out how different settings affect things like cache consistency.
> For example, the lucene-directory module uses the fairly complicated {{Configurations.noDataLossOnJoiner()}} method to validate that a cache is safe for storing lucene indexes.
> Another example is users who would like to use a store for backup, but they don't want read from the store for M/R tasks or when get(k) doesn't find the key in memory.
> One idea would be to define a set of "capabilities" like "state-transfer-complete" or "all-data-in-memory". The user could then add those capabilities in the cache definition, and the cache won't start if the configuration violates those capabilities. The capabilities would also be used internally, to improve the error message when a feature requires a particular combination of settings.
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