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Show / Hide Table of Contents
  • Administrator's Guide
  • NCache Architecture
    • Cache Topologies
    • Cache Cluster
    • Local Cache
    • Cache Client
    • Client Cache
    • Data Load Balancing
    • Cache Server Backward Compatibility
    • Client Backward Compatibility
    • Eviction
    • Indexing
    • Runtime Data Sharing
    • Portable Data Types
    • Class Versioning
    • IP Binding with Multiple NICs
    • Graceful Node Down
    • Separate Cache Host Process
    • Self Healing Dynamic Clustering
  • Configuring Caches
    • Create Cache
      • Creating Local Cache
        • Create New Cache
        • Add Existing Cache
      • Creating Clustered Cache
        • Create New Cache Cluster
        • Add Existing Cache Cluster
    • Remove Cache
    • Clear Cache Contents
    • Adding Server Node in Cache Cluster
    • Removing Server Node from Cache Cluster
    • Configuring Basic Cache Settings
      • Cache Size
      • Cache Isolation Levels
      • Cache Data Expiration
      • Cache Data Format
    • Configuring Cache Cluster Settings
      • Ports
      • Operation Timeout
      • Static Replication Interval
      • Connection Retries
      • Retry Interval
    • Add Test Data to Cache
    • Deploy Providers
    • Configuring Query Indexes
    • Registering Classes for Compact Serialization
      • Registering Non-Generic Classes
      • Unregistering Non-Generic Classes
      • Registering Generic Classes
      • Registering Generic Classes Using Generic Type Handler
    • Registering Classes for Portable Data Sharing
    • Configuring Data Source Providers
      • Read-Through Provider
      • Write-Through Provider
      • Write-Through Provider for Write-Behind Operations
    • Configuring Cache Startup Loader
    • Configuring Cache Level Events
    • Configuring Cache Activity Events
    • Configuring Eviction Policy
    • Configuring Compression
    • Configuring Email Notifications
    • Binding Cluster and Client/Server IP with Multiple NICs
      • Binding Cluster with a Dedicated IP
      • Binding Client/Server with a Dedicated IP
    • Configuring Heartbeat
    • Configuring MapReduce
    • Configuring Communication Reliability
    • Auto Start Cache on Boot
    • Nagling
    • Dual Socket
    • Error Logging
    • Configuration Files
      • Client Side Configurations
        • Client Config
        • EFCaching Config
      • Server Side Configurations
        • Cache Config
        • Bridge Config
        • Security Config
      • Cache Server Configuration
  • Management Operations
    • Start Cache
    • Stop Cache
    • Restart Cache
    • Manage Cache Service on a Server Node
    • Apply Configuration
    • Hot Apply Configuration
    • Reset Configuration
    • Data Load Balancing
  • Configuring Cache Clients
    • Adding Client Node in Cluster
    • Removing Client Node from Cluster
    • Configuring Client Node Settings
    • Creating Client Cache
    • Enable Client Cache on Client Nodes
    • Disable Client Cache on Client Nodes
    • Removing Client Cache
    • Configuring Client Cache Settings
  • Configuring Security
    • Configuring Security for Cache Management
    • Configuring Security for Cache
    • Configuring Security for Client Nodes
    • Configuring Encryption for Cache
    • Configure SSL/TLS Encryption in NCache
  • Configuring Bridge for WAN Replication
    • Creating Clustered Bridge
    • Adding Clustered Caches to Bridge
    • Configuring Bridge Settings
    • Configuring Conflict Resolver
    • Changing Cache Syncronization Modes
    • Configuring Master Cache
    • Force State Transfer
    • Connect/Disconnect Cache in Bridge
    • Remove Cache from Bridge
    • Bridge Management
  • NCache on Docker
    • Using NCache Docker Images
    • Customize NCache Dockerfile
  • Monitoring NCache
    • Cache Counters
    • Monitoring Caches using NCache Manager
      • Changing Management Port of Cache Node
      • Configuring Counters to Display
      • Browse Cache Statistics
      • Cluster Health
      • Monitoring Cache Clusters using NCache Email Alerts
    • Monitoring Caches using NCache Monitor
      • Monitoring with Built-In Dashboard
      • Monitoring with Custom Dashboard
    • Monitoring Bridge using NCache Manager
    • Monitoring NCache using Windows PerfMon Tool
      • Monitoring Cache Server Counters Using PerfMon
      • Monitoring Cache Client Counters Using PerfMon
      • Monitoring Bridge Counters Using PerfMon
    • Logging in NCache
      • NCache Log Viewer
      • NCache Monitor Logging
      • Performance Counters Logging
      • Windows Event Logging
      • Email Notifications on NCache Events
      • Cache Server Logging
      • Client Side API Logging
      • Cache Event IDs
    • Troubleshooting NCache Monitoring
      • Computer Name Not Found
      • Diskperf Not Installed
      • No READ Access to the Perflib Subkeys
      • Unable to Connect to Remote Server
    • IPV6 Support
  • Upgrading NCache Versions
    • Live Upgrade NCache Version
    • Upgrade NCache Version Offline
  • Apply Windows Patches on NCache Server

Live Upgrade NCache Version

NCache allows Live Upgrading NCache 4.6 to 4.9 or NCache 4.4. to 4.6 with negligible data loss. Live Upgrade significantly reduces the delay in your services caused by an upgrade manually. Using Live Upgrade, you can replicate the data of your currently running cache to latest NCache cache using a Bridge in between while the caches continue to run.

The previous version cache is considered as the source cache, and latest NCache cache is considered as the target cache.

Since the data replication is asynchronous, all clients connected to the source cache get an impression that the operations are being performed on the source cache while a complete copy is being made to the target cache seamlessly. Meanwhile, the source cache configuration remains fully functional and unaffected by the upgrade.

In order to upgrade your cache:

  • Create a target cache with the same name and configuration as of the source cache. Please refer to the Creating Caches section for step by step illustration of the process.

  • From the Cache Explorer view, right click on the Bridges node and click Create New Bridge option. The rest of the process for creating bridge is the same as explained in Creating Clustered Bridge for WAN Replication.

  • To this bridge, you need to add running source cache as an active cache. Note that only one cache should be added.

  • On the bridge node, replace IP(s) of the target cache in servers-list key in bridge.ncconf under the <bridge-config>...<cache> tags:

<configuration>
  <bridge-config … >
      <cache … servers-list="20.200.20.38, 20.200.20.29" … />
   </bridge-config>
</configuration>
Important

Make sure the source and target caches are in running state before proceeding with this step.

  • Right click on the bridge name and select Start option in the right click context menu. State transfer will begin automatically.

  • You can monitor the Performance Counters for state transfer using the Statistics window:

  • When the state transfer counter is no longer published, it marks the end of the whole process and any connected clients should be stopped. Otherwise replication is continued.

  • In client.ncconf of each client node, change the IP address of source cache server(s) to the IP addresses of the target cache server(s).

  • Start the clients. By doing so, you are effectively rerouting your clients to the target cache. All future operations by the clients will now be performed on the latest NCache version.

Warning

There might still be negligible pending activity of the source cache taking place which was requested during the state transfer, like fetch operations. It is advisable to let these remaining operations replicate to the target cache completely so that data loss is avoided.

  • Check the counters for the bridge. Once the bridge has no data left in the queue or when the operations have been fully replicated, it is safe to:
    • Stop the bridge.
    • Remove the source cache from the bridge.

You have seamlessly live upgraded to latest NCache version without stopping the cache.

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