Hi Pavel, I am using JMX Metrics to count the cache entries.
Regards Satyajit From: Pavel Tupitsyn <ptupit...@apache.org> Sent: Wednesday, December 6, 2023 11:34 AM To: Mandal, Satyajit: IT (PUN) <satyajit.man...@barclays.com> Cc: user@ignite.apache.org Subject: Re: Data consistency in Ignite and BackUp Filter in Ignite .net node CAUTION: This email originated from outside our organisation - ptupit...@apache.org<mailto:ptupit...@apache.org> Do not click on links, open attachments, or respond unless you recognize the sender and can validate the content is safe. With 1 backup and 1 node loss there should not be any data loss. How do you count the entries? On Wed, Dec 6, 2023 at 8:00 AM <satyajit.man...@barclays.com<mailto:satyajit.man...@barclays.com>> wrote: Hi Pavel, We did testing with BackUp = 1 and with WriteSynchronizationMode as PrimarySync as well as FullSync we found that when we are stopping one node and comparing the count we observed that count of cache size is not matching. There is minimal difference. So is it that if we lose node then there is possibility of data loss and can’t prevent it for in memory cluster? Cluster has 6 nodes. Regards Satyajit From: Pavel Tupitsyn <ptupit...@apache.org<mailto:ptupit...@apache.org>> Sent: Tuesday, June 27, 2023 8:13 PM To: Mandal, Satyajit: IT (PUN) <satyajit.man...@barclays.com<mailto:satyajit.man...@barclays.com>> Cc: user@ignite.apache.org<mailto:user@ignite.apache.org> Subject: Re: Data consistency in Ignite and BackUp Filter in Ignite .net node CAUTION: This email originated from outside our organisation - ptupit...@apache.org<mailto:ptupit...@apache.org> Do not click on links, open attachments, or respond unless you recognize the sender and can validate the content is safe. Hi Satyajit, > ensure backup partitions of a particular node is created in another > node and not in same node No need to do anything, this is the default behavior: backup partitions always reside on a different node. To put it another way: every partition has a primary node and one or more backup nodes. All those nodes are different (given enough nodes in the cluster). - AffinityBackupFilter is for complex use cases when the cluster spreads multiple racks or availability zones [1] [2] - If you have multiple nodes per machine, consider RendezvousAffinityFunction.ExcludeNeighbors property [3] [1] https://ignite.apache.org/releases/latest/dotnetdoc/api/Apache.Ignite.Core.Cache.Affinity.Rendezvous.ClusterNodeAttributeAffinityBackupFilter.html<https://clicktime.symantec.com/15sM1Gy5PdsLM3siGkM23?h=cO_QJLdrtzTxbFFZGD0aLyUUsqezz5X0GCiXSjqzYYg=&u=https://ignite.apache.org/releases/latest/dotnetdoc/api/Apache.Ignite.Core.Cache.Affinity.Rendezvous.ClusterNodeAttributeAffinityBackupFilter.html> [2] https://www.gridgain.com/docs/latest/developers-guide/configuring-caches/managing-data-distribution#backup-filter<https://clicktime.symantec.com/15sM67AMrFYvkzhdpJkAf?h=-Jbv1-ZUpqMUY2xn5IJddtZ2wk_5th5Uy1TKW0AfIqU=&u=https://www.gridgain.com/docs/latest/developers-guide/configuring-caches/managing-data-distribution%23backup-filter> [3] https://ignite.apache.org/releases/latest/dotnetdoc/api/Apache.Ignite.Core.Cache.Affinity.AffinityFunctionBase.html#Apache_Ignite_Core_Cache_Affinity_AffinityFunctionBase_ExcludeNeighbors<https://clicktime.symantec.com/15sLvSmnw2Bjw73njBwsR?h=AdE7UMHeKx0TYXHG0iydrlc2PuNzZ7b4z1rZN_ZVUjw=&u=https://ignite.apache.org/releases/latest/dotnetdoc/api/Apache.Ignite.Core.Cache.Affinity.AffinityFunctionBase.html%23Apache_Ignite_Core_Cache_Affinity_AffinityFunctionBase_ExcludeNeighbors> On Tue, Jun 27, 2023 at 4:02 PM <satyajit.man...@barclays.com<mailto:satyajit.man...@barclays.com>> wrote: Hi Pavel, We are running 6 node cluster with Active Active setup. 3 nodes in one Datacenter and 3 in another datacenter with external cache store enabled for some caches and native persistence enabled for others. Now if we want to setup backup = 1 for in memory caches how that should be done to ensure backup partitions of a particular node is created in another node and not in same node. Also is there any specific settings to ensure data consistency for in memory caches. Can you also share how this settings can be achieved in Ignite(.NET) ( AffinityBackupFilter in RendezvousAffinityFunction) Regards Satyajit Barclays Execution Services Limited registered in England. Registered No. 1767980. Registered office: 1 Churchill Place, London, E14 5HP Barclays Execution Services Limited provides support and administrative services across Barclays group. Barclays Execution Services Limited is an appointed representative of Barclays Bank UK plc, Barclays Bank plc and Clydesdale Financial Services Limited. Barclays Bank UK plc and Barclays Bank plc are authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority. 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