cache coherence

Hello

I'm using coherence. And this is the beginning.

I would like to know: why in examples of coherence, I see all the time a cache by POJO. I explain by a use case:
If there are two POJO: customer and order, there is a cache to store customers, and another cache to store orders.
Why this implementation?


Amel

As others have already pointed out, you can easily store objects of different types in a single cache. However, there are several reasons why you may not to:

1. several features consistency, such as indexes and parallel queries, use extractors of value to retrieve the property values of objects in the cache. If these objects are not in the same category, you probably run questions when using out-of-the-box value extractors, such as the extractor based on the reflection and will have to write your own Extractor which is able to manage differences.

2. different entities within your application will require probably different caching topologies. You can reproduce some objects in read-only or read-mostly on all nodes, while you probably want these types of features that tend to grow in volume over time of the partition. Having a cache by entity type allows you to do this easily.

As a general rule, you want to have a cache by type of entity, just like you'd usually have one table per entity type in a database. In some cases, you will have a single cache by the hierarchy of entity types, especially if all the properties you need indexing and querying on are present on the base class.

Kind regards

ALEKS

Tags: Fusion Middleware

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  • Problems upgrading to 12.3.1 coherence incubator

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    Reg

    Fatou.

    Dasun.Weerasinghe wrote:
    Hello

    I saw a problem when doing the cache.get (object) with the list. Here's my test.

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    Fatou.

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    Published by: robvarga on May 2, 2012 11:44

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    Best regards
    Leon

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                  </front-scheme>
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    I hope this helps!

    See you soon,.
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    2. simply entrySet (Filters), consistency checks the cache, and returns the results based on what is available in the cache.

    In this case, is it not better to use get instead entrySet in a case where we do not know if up-to-date data are available in the Cache?

    1. What is the difference between using a get and entrySet ?
    2. How do we make sure that up-to-date data are available in the cache when the use not a writeback scenario?

    I'm newbie... Gurus, please guide me...

    sjohn wrote:
    Thank you, Robert.

    So the air if I the search parameter is identical to the key, then its better to use get or count with all

    Currently, I have a set of expiry-delay of 1 min on the Cache. So, this extract the expired data from the data store. Are there any trigger to get out of the box of coherence mechanisms?

    I'm not sure that what you call the extraction of trigger mechanism.

    Consistency can make periodic updates cached entries that have recently been consulted within a configurable time thanks to its cooling function in advance. You can read about it at http://wiki.tangosol.com/display/COH35UG/Read-Through%2C+Write-Through%2C+Write-Behind+and+Refresh-Ahead+Caching#Read-Through%2CWrite-Through%2CWrite-BehindandRefresh-AheadCaching-RefreshAheadCache

    If this is not what you're after, would you care to elaborate a little bit on what you need?

    Best regards

    Robert

  • Error if the publication data to the cache passive

    Hello

    I use push active-passive replication. When I add data in the active cache, the data added to the cache but get the error below during publish data on passive cache.

    03/11/31 22:38:06.014/291.473 Oracle coherence GE 3.6.1.0 < error > (thread = Proxy: ExtendTcpProxyService:TcpAcceptor, Member = 1): could not publish EntryOperation {siteName = site1, NOMCLUSTER = Cluster1, cacheName = dist-contact-cache, operation = insert, publishableEntry = PublishableEntry {key = Binary (length = 12, 0x154E094D65656E616B736869 = value), value = Binary (length = 88, value = 0x12813A15A90F00004E094D65656E61
    {{6B736869014E07506C6F74203137024E074368656E6E6169034E0954616D696C4E616475044E06363030303432401A155B014E0524737263244E0E73697465312D436C757374657231), originalValue = Binary (length = 0, value = 0 x)}} dist-contact-Cache Cache due to
    Java.io.StreamCorruptedException (packed): invalid type: Class: com.oracle.coherence.patterns.pushreplication.publishers.cache.AbstractCachePublisher 78
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    Here is my file of xml configuration of cache coherence
    _________________________________
    ! SYSTEM cache-config DOCTYPE "cache - config.dtd" >

    < xmlns:sync = "class: com.oracle.coherence.patterns.pushreplication.configuration.PushReplicationNamespaceContentHandler cache-config" >
    <>- cached patterns
    <: pof-enabled synchronization provider = "true" >
    < sync: consistency-provider / >
    < / sync: provider >

    < cache-system-mapping >
    <>cache-mapping
    < name of cache - > dist-contact-cache < / cache-name >
    < scheme name > distributed-scheme-with-edition-dumps < / system-name >
    < sync: Editor >
    < sync: Publisher-name > active Editor < / sync: Publisher-name >
    < sync: Editor-system >
    < sync: remote-cluster-editor-system >
    < sync: remote-invocation-service-name > remote control-site2 < / sync: remote-invocation-service-name >
    < sync: remote-editor-system >
    < sync: local-cache-editor-system >
    < sync: target-cache-name > dist-contact-cache < / sync: target-cache-name >
    < / sync: local-cache-editor-system >
    < / sync: remote-editor-system >
    true < sync: autostart > < / sync: autostart >
    < / sync: remote-cluster-editor-system >
    < / sync: Editor-system >
    < / sync: Editor >
    < / cache-mapping >
    < / cache-system-mapping >
    < proxy-system >
    < service name > ExtendTcpProxyService < / service-name >
    < number of threads > 5 < / thread count >
    < Acceptor-config >
    <>tcp-Acceptor
    < address - >
    localhost < address > < / address >
    < port > 9099 < / port >
    < / local-address >
    < / tcp-Acceptor >
    < / Acceptor-config >
    < autostart > true < / autostart >
    < / proxy-system >

    < remote-invocation-plan >
    < service name > remote control-site2 < / service-name >
    < initiator-config >
    <>tcp-initiator
    <>remote addresses
    > the socket address <
    localhost < address > < / address >
    < port > 5000 < / port >
    < / socket-address >
    < / remote-address >
    < connect-timeout > 2 s < / connect-timeout >
    < / tcp-initiator >
    < outgoing-message Manager >
    < request-timeout > s 5 < / timeout request >
    < / Manager of outbound messages >
    < / initiator-config >
    < serializer >
    > class name < com.tangosol.io.pof.ConfigurablePofContext < / class name >
    < / serializer >
    < / remote-invocation-plan >

    < / cache-plans >
    < / cache-config >

    Thanks for the quick post. Please try to add "-Dtangosol.pof.enabled = true" to the active and passive server startup;
    and just to be sure to add "-Dtangosol.coherence.distributed.localstorage = true" as well.

    Mark J

  • What is the difference between objects and units in coherence?

    What is the difference between objects and units in coherence?
    For example, < high-units >

    The units are the number of entries of data stored in the coherence of caches.
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    The objects are the number of entries of data stored in cache coherence excluding the entries for other purposes (for example, backup).

    RE: To get Coherence to report object sizes you need to set the unit-caculator to binary.

    If you don caculator-unit set, consistency can use the default setting (set) to the report.

  • The configuration files are used to create this cache server?

    I start a cache server by running the $COHERENCE_HOME/bin/cache-server.sh file. But I don't how it is configured.
    The configuration files are used to create this cache server? How do I know?
    I check the contents of the cache-.sh file.
    In my view, the config.xml file - cache-coherence, consistency-pof - config.xml file and leader tangosol-coherence are used, no?

    After the start of a cache server, view the output carefully and you will find the configuration files are used. For example, the configuration files are displayed in bold background in the following text:

    F:\coherence\coherence\bin>cache-server.cmd
java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Server VM (build 14.2-b01, mixed mode)

2009-11-30 22:46:06.468/1.547 Oracle Coherence 3.5/459  (thread=main, member=n/a): Loaded oper
ational configuration from resource "jar:file:/F:/coherence/coherence/lib/coherence.jar!/ *tangosol-co*
*herence.xml"*
2009-11-30 22:46:06.484/1.563 Oracle Coherence 3.5/459  (thread=main, member=n/a): Loaded oper
ational overrides from resource "jar:file:/F:/coherence/coherence/lib/coherence.jar!/ *tangosol-cohere*
*nce-override-dev.xml"*
2009-11-30 22:46:06.500/1.579 Oracle Coherence 3.5/459  (thread=main, member=n/a): Optional conf
iguration override "/tangosol-coherence-override.xml" is not specified
2009-11-30 22:46:06.500/1.579 Oracle Coherence 3.5/459  (thread=main, member=n/a): Optional conf
iguration override "/custom-mbeans.xml" is not specified

Oracle Coherence Version 3.5/459
 Grid Edition: Development mode
Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved.

2009-11-30 22:46:07.468/2.547 Oracle Coherence GE 3.5/459  (thread=main, member=n/a): Loaded c
ache configuration from resource "jar:file:/F:/coherence/coherence/lib/coherence.jar!/ *coherence-cach*
*e-config.xml"*
2009-11-30 22:46:08.515/3.594 Oracle Coherence GE 3.5/459  (thread=Cluster, member=n/a): Service
 Cluster joined the cluster with senior service member n/a
2009-11-30 22:46:11.765/6.844 Oracle Coherence GE 3.5/459  (thread=Cluster, member=n/a): Creat
ed a new cluster "cluster:0xD7DB" with Member(Id=1, Timestamp=2009-11-30 22:46:08.109, Address=192.1
68.0.8:8088, MachineId=26632, Location=site:localdomain,machine:host1,process:1060, Role=CoherenceSe
rver, Edition=Grid Edition, Mode=Development, CpuCount=1, SocketCount=1) UID=0xC0A800080000012548585
C6D68081F98
2009-11-30 22:46:11.796/6.875 Oracle Coherence GE 3.5/459  (thread=Invocation:Management, member
=1): Service Management joined the cluster with senior service member 1
2009-11-30 22:46:12.515/7.594 Oracle Coherence GE 3.5/459  (thread=DistributedCache, member=1):
Service DistributedCache joined the cluster with senior service member 1
2009-11-30 22:46:12.593/7.672 Oracle Coherence GE 3.5/459  (thread=ReplicatedCache, member=1): S
ervice ReplicatedCache joined the cluster with senior service member 1
2009-11-30 22:46:12.609/7.688 Oracle Coherence GE 3.5/459  (thread=OptimisticCache, member=1): S
ervice OptimisticCache joined the cluster with senior service member 1
2009-11-30 22:46:12.625/7.704 Oracle Coherence GE 3.5/459  (thread=Invocation:InvocationService,
 member=1): Service InvocationService joined the cluster with senior service member 1
2009-11-30 22:46:12.625/7.704 Oracle Coherence GE 3.5/459  (thread=main, member=1): Started De
faultCacheServer...

SafeCluster: Name=cluster:0xD7DB

Group{Address=224.3.5.0, Port=35459, TTL=4}

MasterMemberSet
  (
  ThisMember=Member(Id=1, Timestamp=2009-11-30 22:46:08.109, Address=192.168.0.8:8088, MachineId=266
32, Location=site:localdomain,machine:host1,process:1060, Role=CoherenceServer)
  OldestMember=Member(Id=1, Timestamp=2009-11-30 22:46:08.109, Address=192.168.0.8:8088, MachineId=2
6632, Location=site:localdomain,machine:host1,process:1060, Role=CoherenceServer)
  ActualMemberSet=MemberSet(Size=1, BitSetCount=2
    Member(Id=1, Timestamp=2009-11-30 22:46:08.109, Address=192.168.0.8:8088, MachineId=26632, Locat
ion=site:localdomain,machine:host1,process:1060, Role=CoherenceServer)
    )
  RecycleMillis=120000
  RecycleSet=MemberSet(Size=0, BitSetCount=0
    )
  )

Services
  (
  TcpRing{TcpSocketAccepter{State=STATE_OPEN, ServerSocket=192.168.0.8:8088}, Connections=[]}
  ClusterService{Name=Cluster, State=(SERVICE_STARTED, STATE_JOINED), Id=0, Version=3.5, OldestMembe
rId=1}
  InvocationService{Name=Management, State=(SERVICE_STARTED), Id=1, Version=3.1, OldestMemberId=1}
  DistributedCache{Name=DistributedCache, State=(SERVICE_STARTED), LocalStorage=enabled, PartitionCo
unt=257, BackupCount=1, AssignedPartitions=257, BackupPartitions=0}
  ReplicatedCache{Name=ReplicatedCache, State=(SERVICE_STARTED), Id=3, Version=3.0, OldestMemberId=1
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  Optimistic{Name=OptimisticCache, State=(SERVICE_STARTED), Id=4, Version=3.0, OldestMemberId=1}
  InvocationService{Name=InvocationService, State=(SERVICE_STARTED), Id=5, Version=3.1, OldestMember
Id=1}
  )

  • Coherence for explanation NearCache JMX beans

    Hello
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    Hi lazanik,.

    The construction side of customer such a NearCache is usually limited by the corresponding class loader. Imagine an application server running two different applications that have access to the cache even in a grid. Because the card before the near cache stores data in the format of the object (in contrast to the support cards that store data in an internal binary representation), it cannot be shared between these two applications. The attribute class-loader uses a scope id to differentiate between these levels before two cards (and corresponding MBeans).

    Kind regards
    Gene

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