Example of a Coherence near cache config.

Looking at the wiki, it states that the near cache is
Listener-based Near caches are coherent; expiry-based near caches are partially coherent for non-transactional reads and coherent for transactional access.
Is there a configuration file example for a listener-based near cache?

Hi George,
Near cache example: Local cache of a partitioned cache (Near cache).
invalidation-strategy element of a near-scheme specifies the strategy used keep the front-tier in-sync with the back-tier:
* none - instructs the cache not to listen for invalidation events at all. This is the best choice for raw performance and scalability when business requirements permit the use of data which might not be absolutely current. Freshness of data can be guaranteed by use of a sufficiently brief eviction policy. The worst case performance is identical to a standard Distributed cache.
* present - instructs the near cache to listen to the back map events related only to the items currently present in the front map.
This strategy works best when cluster nodes have sticky data access patterns (for example, HTTP session management with a sticky load balancer).
* all - instructs the near cache to listen to all back map events.
This strategy is optimal for read-heavy access patterns where there is significant overlap between the front caches on each cluster member.
* auto - instructs the near cache to switch between present and all strategies automatically based on the cache statistics.
Regards,
Dimitri

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    +2012-02-16 12:00:29.175/1219.193 Oracle Coherence 3.7.1.0 <D5> (thread=[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)', member=n/a): Optional configuration override "/tangosol-coherence-override.xml" is not specified+
    +2012-02-16 12:00:29.179/1219.197 Oracle Coherence 3.7.1.0 <D5> (thread=[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)', member=n/a): Optional configuration override "/custom-mbeans.xml" is not specified+
    Oracle Coherence Version 3.7.1.0 Build 27797
    Grid Edition: Development mode
    Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
    +2012-02-16 12:00:30.069/1220.087 Oracle Coherence GE 3.7.1.0 <Info> (thread=[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)', member=n/a): Loaded Reporter configuration from "zip:D:/OracleFM/R11.1.1.5/WLSGeneric/user_projects/domains/mvn_domain1/servers/WLSServer-1/tmp/_WL_user/TestEAR/g0yzyu/lib/coherence.jar!/reports/report-group.xml"+
    And this from WLS-log:
    +####<Feb 16, 2012 12:00:31 PM FET> <Info> <com.oracle.wls> <EPBYMINW0269> <WLSServer-1> <Logger@1380966230 3.7.1.0> <<anonymous>> <> <> <1329382831441> <BEA-000000> <2012-02-16 12:00:31.441/1221.459 Oracle Coherence GE 3.7.1.0 <Info> (thread=Cluster, member=n/a): This Member(Id=3, Timestamp=2012-02-16 12:00:31.425, Address=10.6.12.61:8888, MachineId=54771, Location=site:,machine:EPBYMINW0269,process:6252, Role=WeblogicServer, Edition=Grid Edition, Mode=Development, CpuCount=4, SocketCount=4) joined cluster "cluster:0x75CB" with senior Member(Id=1, Timestamp=2012-02-16 11:39:07.242, Address=10.6.12.61:9888, MachineId=54771, Location=site:,machine:EPBYMINW0269,process:3012,member:Coherence37Server-0, Role=WeblogicWeblogicCacheServer, Edition=Grid Edition, Mode=Development, CpuCount=4, SocketCount=4)>+
    +####<Feb 16, 2012 12:00:31 PM FET> <Info> <com.oracle.wls> <EPBYMINW0269> <WLSServer-1> <Logger@9259509 3.7.1.0> <<anonymous>> <> <> <1329382831661> <BEA-000000> <2012-02-16 12:00:31.661/1221.679 Oracle Coherence GE 3.7.1.0 <Info> (thread=[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)', member=n/a): Started cluster Name=cluster:0x75CB+
    +Group{Address=231.1.1.1, Port=7777, TTL=4}+
    MasterMemberSet(
    ThisMember=Member(Id=3, Timestamp=2012-02-16 12:00:31.425, Address=10.6.12.61:8888, MachineId=54771, Location=site:,machine:EPBYMINW0269,process:6252, Role=WeblogicServer)
    OldestMember=Member(Id=1, Timestamp=2012-02-16 11:39:07.242, Address=10.6.12.61:9888, MachineId=54771, Location=site:,machine:EPBYMINW0269,process:3012,member:Coherence37Server-0, Role=WeblogicWeblogicCacheServer)
    ActualMemberSet=MemberSet(Size=3
    Member(Id=1, Timestamp=2012-02-16 11:39:07.242, Address=10.6.12.61:9888, MachineId=54771, Location=site:,machine:EPBYMINW0269,process:3012,member:Coherence37Server-0, Role=WeblogicWeblogicCacheServer)
    Member(Id=2, Timestamp=2012-02-16 11:39:10.74, Address=10.6.12.61:9890, MachineId=54771, Location=site:,machine:EPBYMINW0269,process:3592,member:Coherence37Server-1, Role=WeblogicWeblogicCacheServer)
    Member(Id=3, Timestamp=2012-02-16 12:00:31.425, Address=10.6.12.61:8888, MachineId=54771, Location=site:,machine:EPBYMINW0269,process:6252, Role=WeblogicServer)
    +)+
    MemberId|ServiceVersion|ServiceJoined|MemberState
    +1|3.7.1|2012-02-16 11:39:07.242|JOINED,+
    +2|3.7.1|2012-02-16 11:39:10.74|JOINED,+
    +3|3.7.1|2012-02-16 12:00:31.646|JOINED+
    RecycleMillis=1200000
    RecycleSet=MemberSet(Size=0
    +)+
    +)+
    +TcpRing{Connections=[2]}+
    +IpMonitor{AddressListSize=0}+
    +>+
    +####<Feb 16, 2012 12:00:31 PM FET> <Info> <com.oracle.wls> <EPBYMINW0269> <WLSServer-1> <Logger@9259509 3.7.1.0> <<anonymous>> <> <> <1329382831916> <BEA-000000> <2012-02-16 12:00:31.916/1221.934 Oracle Coherence GE 3.7.1.0 <Info> (thread=[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)', member=3): Loaded cache configuration from "zip:D:/OracleFM/R11.1.1.5/WLSGeneric/user_projects/domains/mvn_domain1/servers/WLSServer-1/tmp/_WL_user/TestEAR/g0yzyu/lib/coherence.jar!/coherence-cache-config.xml">+
    +####<Feb 16, 2012 12:00:32 PM FET> <Info> <Deployer> <EPBYMINW0269> <WLSServer-1> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1329382832019> <BEA-149059> <Module EjbWebServices.jar of application TestEAR is transitioning from STATE_NEW to STATE_PREPARED on server WLSServer-1.>+
    +####<Feb 16, 2012 12:00:32 PM FET> <Info> <com.oracle.wls> <EPBYMINW0269> <WLSServer-1> <Logger@9259509 3.7.1.0> <<anonymous>> <> <> <1329382832020> <BEA-000000> <2012-02-16 12:00:32.018/1222.036 Oracle Coherence GE 3.7.1.0 <Info> (thread=[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)', member=3): Loaded cache configuration from "zip:D:/OracleFM/R11.1.1.5/WLSGeneric/user_projects/domains/mvn_domain1/servers/WLSServer-1/tmp/_WL_user/TestEAR/g0yzyu/EjbWebServices.jar!/META-INF/coherence-cache-config.xml">+
    +####<Feb 16, 2012 12:00:32 PM FET> <Info> <EJB> <EPBYMINW0269> <WLSServer-1> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1329382832037> <BEA-010008> <EJB Deploying file: EjbWebServices.jar>+

  • Coherence-cache-config

    Hi,
    I have an exe, which connects to coherence and allows me to dump data to the cache. I have moved this code to a lib, which now being called from a dll.
    As far as possible the project settings are the same. When I try to connect to the cache via CacheFactory::getCache("dist-test"), and exception is thrown indicating that there is an error opening file "coherence-cache-config".
    I have no idea where to go from here. Where should coherence-cache-config be located?
    I appreciate any help on this.
    Thanks.

    The coherence library will look for the config file in the applications current directory, which unless you do something to change will be the application start directory. Alternatively you can tell Coherence the explicit location of the file, likely obtaining this location either from the command line or from you own config. The CacheFactory::loadXml and CacheFactory::comdigure methods are what you would need to invoke, see http://download.oracle.com/docs/cd/E15357_01/coh.360/e15728/classcoherence_1_1net_1_1_cache_factory.html#ba843198c7451b654834746a4e300036
    Thanks,
    Mark
    Oracle Coherence

  • Read-Through Caching with expiry-delay and near cache (front scheme)

    We are experiencing a problem with our custom CacheLoader and near cache together with expiry-delay on the backing map scheme.
    I was under the assumption that it was possible to have an expiry-delay configured on the backing-scheme and that the near cache object was evicted when backing object was evicted. But according to our tests we have to put an expiry-delay on the front scheme too.
    Is my assumption correct that there will not be automatic eviction on the near cache (front scheme)?
    With this config, near cache is never cleared:
                 <near-scheme>
                      <scheme-name>config-part</scheme-name>
                      <front-scheme>
                            <local-scheme />
                      </front-scheme>
                      <back-scheme>
                            <distributed-scheme>
                                  <scheme-ref>config-part-distributed</scheme-ref>
                            </distributed-scheme>
                      </back-scheme>
                <autostart>true</autostart>
                </near-scheme>
                <distributed-scheme>
                      <scheme-name>config-part-distributed</scheme-name>
                      <service-name>partDistributedCacheService</service-name>
                      <thread-count>10</thread-count>
                      <backing-map-scheme>
                            <read-write-backing-map-scheme>
                                  <read-only>true</read-only>
                                  <scheme-name>partStatusScheme</scheme-name>
                                  <internal-cache-scheme>
                                        <local-scheme>
                                              <scheme-name>part-eviction</scheme-name>
                                              <expiry-delay>30s</expiry-delay>
                                        </local-scheme>
                                  </internal-cache-scheme>
                                  <cachestore-scheme>
                                        <class-scheme>
                                              <class-name>net.jakeri.test.PingCacheLoader</class-name>
                                        </class-scheme>
                                  </cachestore-scheme>
                                  <refresh-ahead-factor>0.5</refresh-ahead-factor>
                            </read-write-backing-map-scheme>
                      </backing-map-scheme>
                      <autostart>true</autostart>
                      <local-storage system-property="tangosol.coherence.config.distributed.localstorage">true</local-storage>
                </distributed-scheme>With this config (added expiry-delay on front-scheme), near cache gets cleared.
            <near-scheme>
                      <scheme-name>config-part</scheme-name>
                      <front-scheme>
                            <local-scheme>
                                 <expiry-delay>15s</expiry-delay>
                            </local-scheme>
                      </front-scheme>
                      <back-scheme>
                            <distributed-scheme>
                                  <scheme-ref>config-part-distributed</scheme-ref>
                            </distributed-scheme>
                      </back-scheme>
                <autostart>true</autostart>
                </near-scheme>
                <distributed-scheme>
                      <scheme-name>config-part-distributed</scheme-name>
                      <service-name>partDistributedCacheService</service-name>
                      <thread-count>10</thread-count>
                      <backing-map-scheme>
                            <read-write-backing-map-scheme>
                                  <read-only>true</read-only>
                                  <scheme-name>partStatusScheme</scheme-name>
                                  <internal-cache-scheme>
                                        <local-scheme>
                                              <scheme-name>part-eviction</scheme-name>
                                              <expiry-delay>30s</expiry-delay>
                                        </local-scheme>
                                  </internal-cache-scheme>
                                  <cachestore-scheme>
                                        <class-scheme>
                                              <class-name>net.jakeri.test.PingCacheLoader</class-name>
                                        </class-scheme>
                                  </cachestore-scheme>
                                  <refresh-ahead-factor>0.5</refresh-ahead-factor>
                            </read-write-backing-map-scheme>
                      </backing-map-scheme>
                      <autostart>true</autostart>
                      <local-storage system-property="tangosol.coherence.config.distributed.localstorage">true</local-storage>
                </distributed-scheme>

    Hi Jakkke,
    The Near Cache scheme allows to have configurable levels of cache coherency from the most basic expiry based cache to invalidation based cache to data versioning cache depending on the coherency requirements. The Near Cache is commonly used to achieve the performance of replicated cache without losing the scalability aspects of replicated cache and this is achieved by having a subset of data (based on MRU or MFU) in the <front-scheme> of the near cache and the complete set of data in the <back-scheme> of near cache. The <back-scheme> updates can automatically trigger events to invalidate the entries in the <front-scheme> based on the invalidation strategy (present, all, none, auto) configured for the near cache.
    If you want to expire the entries in the <front-scheme> and <back-scheme>, you need to specify an expiry-delay on both the schemes as mentioned by you in the last example. Now if you are expiring the items in the <back-scheme> for the reason that they get loaded again from the cache-store but the <front-scheme> keys remain same (only the values should be refreshed from the cache store) then you need not set the expiry-delay on the <front-scheme> rather mention the invalidation-strategy as present. But if you want to have a different set of entries in <front-scheme> after a specified expiry delay then you need to mention it in the <front-scheme> configuration.
    The near cache has the capability to keep front scheme and back scheme data in sync but the expiry of entries is not synced. Always, front-scheme is a subset of back-scheme.
    Hope this helps!
    Cheers,
    NJ

  • Compacting the cache-config.xml for multiple cache-store

    Hi,
    I have a cache-config.xml that has various ReadWriteBackingMaps with different CacheLoader implementations. I was wondering of the best way to compact this xml using the scheme-ref tag, as all I really need is schemes, with different cache stores. e.g. I have an InstrumentCacheStore and a CurrencyCacheStore .. which invoke different CacheLoaders. they are both distributed caches.
    I thought the below would work, but it dosen't.. :( when loading a currency, the InstrumentCacheStore gets invoked.
    is there a way to compact this XML? Else, for 6 different cache loaders that I have, do I have to specify the whole distributed-scheme again and again?
    <cache-config>
    <caching-scheme-mapping>
    <cache-mapping>
    <cache-name>instrument-*</cache-name>
    <scheme-name>distributed-instrument-scheme</scheme-name>
    </cache-mapping>
    <cache-mapping>
    <cache-name>currency-*</cache-name>
    <scheme-name>distributed-currency-scheme</scheme-name>
    </cache-mapping>
    </caching-scheme-mapping>
    <caching-schemes>
    <distributed-scheme>
    <scheme-name>distributed-instrument-scheme</scheme-name>
    <scheme-ref>distributed-scheme</scheme-ref>
    </distributed-scheme>
    <distributed-scheme>
    <scheme-name>distributed-currency-scheme</scheme-name>
    <scheme-ref>distributed-scheme</scheme-ref>
    <!-- THIS DOES NOT OVERRIDE THE DEFAULT distributed-scheme? -->
    <cachestore-scheme>
    <class-scheme>
    <class-name>coherence.cachestore.CurrencyCacheStore</class-name>
    </class-scheme>
    </cachestore-scheme>
    </distributed-scheme>
    <distributed-scheme>
    <scheme-name>distributed-scheme</scheme-name>
    <service-name>DistributedCache</service-name>
    <backing-map-scheme>
    <read-write-backing-map-scheme>
    <internal-cache-scheme>
    <local-scheme>
    <scheme-ref>LocalSizeLimited</scheme-ref>
    </local-scheme>
    </internal-cache-scheme>
    <cachestore-scheme>
    <class-scheme>
    <class-name>coherence.cachestore.InstrumentCacheStore</class-name>
    </class-scheme>
    </cachestore-scheme>
    </read-write-backing-map-scheme>
    </backing-map-scheme>
    <serializer>
    <class-name>com.tangosol.io.pof.ConfigurablePofContext</class-name>
    </serializer>
    <partition-count>5557</partition-count>
    <backup-count>1</backup-count>
    <thread-count>10</thread-count>
    <autostart>true</autostart>
    </distributed-scheme>
    <local-scheme>
    <scheme-name>LocalSizeLimited</scheme-name>
    <high-units>500000000</high-units>
    <low-units>10000</low-units>
    <unit-calculator>BINARY</unit-calculator>
    </local-scheme>
    </caching-schemes>
    </cache-config>
    --------------------------------------------------------------------------------------------------------------

    There are two possible ways to sort this out
    1. The cache configuration for the distributed-currency-scheme shown in the original post is wrong and does not correctly override the cache store, it should look like this:.
    <distributed-scheme>
      <scheme-name>distributed-currency-scheme</scheme-name>
      <scheme-ref>distributed-scheme</scheme-ref>
      <backing-map-scheme>
        <read-write-backing-map-scheme>
          <internal-cache-scheme>
            <local-scheme>
              <scheme-ref>LocalSizeLimited</scheme-ref>
            </local-scheme>
          </internal-cache-scheme>
          <cachestore-scheme>
            <class-scheme>
              <class-name>coherence.examples.CurrencyCacheStore</class-name>
            </class-scheme>
          </cachestore-scheme>
        </read-write-backing-map-scheme>
      </backing-map-scheme>
    </distributed-scheme> 2. You can use a single scheme and parameterise it like this:
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    <!DOCTYPE cache-config SYSTEM "cache-config.dtd">
    <cache-config>
      <caching-scheme-mapping>
        <cache-mapping>
          <cache-name>instrument-*</cache-name>
          <scheme-name>distributed-scheme</scheme-name>
          <init-params>
            <init-param>
              <param-name>cache-store-class-name</param-name>
              <param-value>coherence.examples.InstrumentCacheStore</param-value>
            </init-param>
          </init-params>
        </cache-mapping>
        <cache-mapping>
          <cache-name>currency-*</cache-name>
          <scheme-name>distributed-scheme</scheme-name>
          <init-params>
            <init-param>
              <param-name>cache-store-class-name</param-name>
              <param-value>coherence.examples.CurrencyCacheStore</param-value>
            </init-param>
          </init-params>
        </cache-mapping>
      </caching-scheme-mapping>
      <caching-schemes>
        <distributed-scheme>
          <scheme-name>distributed-scheme</scheme-name>
          <service-name>DistributedCache</service-name>
          <backing-map-scheme>
            <read-write-backing-map-scheme>
              <internal-cache-scheme>
                <local-scheme>
                  <scheme-ref>LocalSizeLimited</scheme-ref>
                </local-scheme>
              </internal-cache-scheme>
              <cachestore-scheme>
                <class-scheme>
                  <class-name>{cache-store-class-name}</class-name>
                </class-scheme>
              </cachestore-scheme>
            </read-write-backing-map-scheme>
          </backing-map-scheme>
          <serializer>
            <class-name>com.tangosol.io.pof.ConfigurablePofContext</class-name>
          </serializer>
          <partition-count>5557</partition-count>
          <backup-count>1</backup-count>
          <thread-count>10</thread-count>
          <autostart>true</autostart>
        </distributed-scheme>
        <local-scheme>
          <scheme-name>LocalSizeLimited</scheme-name>
          <high-units>500000000</high-units>
          <low-units>10000</low-units>
          <unit-calculator>BINARY</unit-calculator>
        </local-scheme>
      </caching-schemes>
    </cache-config>Parameter names from the init-params part of each cache mapping can be used inside curly brackets in the cache scheme part.
    Hope that helps,
    JK

  • Update to near cache value is not reflected in the other near cache

    Hi,
    I have a cluster of two weblogic servers running within them tangosol cache. I also have two seperate tangosol servers running on the same two servers.
    When I make an update on the tangosol cache on one of the weblogic application, unfortunately the update is not picked up by the other weblogic application tangosol cache.
    What do I need to do so that all updates are available in all the tangosol cache?
    example below:
    initial:
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    server2: weblogic tangosol near cache, key = "One", Value = null
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    server2: weblogic tangosol near cache, key = "One", Value = null <- still null (?)
    Why is the value on server2 not updated also?
    Thanks.
    The tangosol configuration is a near distributed cache. The xml is below. Thanks.
    <?xml version="1.0"?>
    <!DOCTYPE cache-config SYSTEM "cache-config.dtd">
    <cache-config>
    <caching-scheme-mapping>
    <!--
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    -->
    <cache-mapping>
    <cache-name>*</cache-name>
    <scheme-name>default-near</scheme-name>
    </cache-mapping>
    </caching-scheme-mapping>
    <caching-schemes>
    <!--
    Default simple Near caching scheme with default eviction local cache
    in the front-tier and a non-expiring distributed cache in the back-tier.
    -->
    <near-scheme>
    <scheme-name>default-near</scheme-name>
    <front-scheme>
    <local-scheme>
    <scheme-ref>default-eviction</scheme-ref>
    </local-scheme>
    </front-scheme>
    <back-scheme>
    <distributed-scheme>
    <scheme-ref>default-distributed</scheme-ref>
    </distributed-scheme>
    </back-scheme>
    <!--
    invalidation auto = all changes in back caches gets notified
    present = subscribes to only changes thats held in near cache
    -->
    <invalidation-strategy>auto</invalidation-strategy>
    <!-- the cache server starts does not start all the schemes -->
    <autostart>false</autostart>
    </near-scheme>
    <!--
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    <distributed-scheme>
    <scheme-name>default-distributed</scheme-name>
    <service-name>DistributedCache</service-name>
    <backing-map-scheme>
    <class-scheme>
    <scheme-ref>default-backing-map</scheme-ref>
    </class-scheme>
    </backing-map-scheme>
    <autostart>true</autostart>
    </distributed-scheme>
    <!--
    Default backing map scheme definition used by all the caches that do
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    -->
    <class-scheme>
    <scheme-name>default-backing-map</scheme-name>
    <class-name>com.tangosol.util.SafeHashMap</class-name>
    <init-params></init-params>
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    <!--
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    <local-scheme>
    <scheme-name>default-eviction</scheme-name>
    <eviction-policy>HYBRID</eviction-policy>
    <high-units>100000</high-units>
    <low-units>0</low-units>
    <expiry-delay>0</expiry-delay>
    <flush-delay>0</flush-delay>
    <cachestore-scheme></cachestore-scheme>
    </local-scheme>
    </caching-schemes>
    </cache-config>

    We can certainly set up a call to discuss what you are seeing. Please email [email protected] with your phone number and other information to set up the call.
    The more information that you can provide in advance (on the forum or by email), the better. For example, send your configuration settings (cache configuration, cluster configuration) files.
    Peace.

  • Can off JVM heap Memory used in the Near-Cache front-tier

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          <front-scheme>
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          </front-scheme>
          <back-scheme>
            <distributed-scheme>
              <scheme-ref>CohApp-distributed</scheme-ref>
            </distributed-scheme>
          </back-scheme>
          <invalidation-strategy>auto</invalidation-strategy>
          <autostart>true</autostart>
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    Oracle Coherence Version 3.7.1.0 Build 27797
    Enterprise Edition: Development mode
    Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
    2014-03-30 16:34:17.518/1.201 Oracle Coherence EE 3.7.1.0 <Error> (thread=main,
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    d content was found starting with element 'external-scheme'. One of '{"http://xm
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    cle.com/coherence/coherence-cache-config":class-scheme}' is expected. - line 92
    Exception in thread "main" (Wrapped: Failed to load the factory) (Wrapped: Missi
    ng or inaccessible constructor "com.tangosol.net.DefaultConfigurableCacheFactory
    (String)"
    <configurable-cache-factory-config>
      <class-name>com.tangosol.net.DefaultConfigurableCacheFactory</class-name>
      <init-params>
        <init-param>
          <param-type>java.lang.String</param-type>
          <param-value>coherence-cache-config.xml</param-value>
        </init-param>
      </init-params>
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            at com.tangosol.util.Base.ensureRuntimeException(Base.java:288)
            at com.tangosol.net.ScopedCacheFactoryBuilder.getDefaultFactory(ScopedCa
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    <configurable-cache-factory-config>
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            ... 20 more
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