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Show / Hide Table of Contents
  • Administrator's Guide
  • NCache Architecture
    • Cache Topologies
      • Partitioned Topologies
      • Replicated Topology
      • Mirrored Topology
      • Scalability in Topologies
    • Dynamic Clustering
    • Local Cache
    • Cache Client
    • Client Cache
    • Bridge for WAN Replication
    • Connectivity with Load Balancer
    • Serialization Format
    • Data Encryption
    • Data Compression
    • Data Load Balancing
    • Pipelining
    • Cache Server Backward Compatibility
    • Client Backward Compatibility
    • Eviction
    • Indexing
    • Split-Brain
    • Maintenance Mode
    • Runtime Data Sharing
    • Portable Data Types
    • Class Versioning
    • IP Binding with Multiple NICs
    • Graceful Node Down
    • Separate Cache Host Process
    • Self Healing Dynamic Clustering
    • Distributed Cache with Persistence
  • NCache Management Center
  • Configure Caches
    • Create a Cache
      • Local Cache Overview
        • Local Cache
        • Local Cache with Persistence
        • Pub/Sub Messaging Cache
        • Add Existing Cache
      • Clustered Cache Overview
        • Distributed Cache
        • Persistent Distributed Cache
        • Pub/Sub Messaging Cache
        • Add Existing Clustered Cache
        • Troubleshooting
    • Remove Cache
    • Clear Cache
    • Add Server Node
    • Remove Server Node
    • Add Test Data
    • Configure Query Indexes
    • Configure JSON Query Indexes
    • Compact Serialization
      • Non-Generic Registration
      • Non-Generic Unregistration
      • Generic Registration
      • Using Type Handler
    • Deploy Providers
    • Configure Custom Dependency
    • Add Data Source Providers
      • Read-Through Provider
      • Write-Through Provider
      • Write-Behind Provider
    • Loader and Refresher
    • Configure Maintenance Mode
      • Stop for Maintenance Mode
      • Exit Maintenance Mode
    • Configure LINQPad
      • Configure LinqPad for NCache
      • Querying Data in LinqPad
  • Configure Clients
    • Add Client Node
    • Remove Client Node
  • Configure Client Cache
    • Create Client Cache
    • Create Client Cache with NuGet
    • Enable Client Cache on Client Nodes
    • Disable Client Cache on Client Nodes
    • Remove Client Cache
  • Management Operations
    • Start Cache
    • Stop Cache
    • Restart Cache
    • Manage Cache Service on a Server Node
    • Memory Dumps
    • Data Load Balancing
    • Invoke Refresher Dataset
    • Import/Export Cache Data
    • Import Lucene Indexes
    • Suspend/Resume NCache Data Persistence
    • Backup and Restore NCache Persisted Data
  • Cache Settings
    • General Cache Settings
      • Cache Size
      • Cache Isolation Levels
      • Cache Serialization Format
      • Cache Data Expiration
    • Cache Cluster Settings
      • Ports
      • Operation Timeout
      • Configure Pipelining
      • Static Replication Interval
      • Connection Retries
      • Retry Interval
      • Split-Brain Auto Recovery
    • NCache Persistence Settings
      • Store Information
      • Persistence Interval
    • Error Logging
    • Cache Level Events
    • Client Activity Events
    • Eviction Policy
    • MapReduce
    • Register Classes for Portable Data Sharing
    • Compression
    • Email Notifications
    • Bind IP with Multiple NICs
      • Bind Cluster with a Dedicated IP
      • Bind Client/Server with a Dedicated IP
    • Heartbeat
    • Keep Alive
    • Client Death Detection
    • Communication Reliability
    • Auto Start Cache on Boot
    • Nagle's Algorithm
    • Dual Socket
    • Configuration Files
      • Client Side Configurations
        • Client Config
        • EFCaching Config
      • Server Side Configurations
        • Cache Config
        • Bridge Config
        • Modules Config
        • Security Config
        • TLS Config
        • Monitoring Config
        • Emails Template
  • Cache Server Settings
    • Server Connectivity
    • Bind to Multiple NICs
    • Server Ports
    • Memory
    • Custom Dependency
    • Request Inquiry
    • Windows Events
    • Message Events
    • Expiration & Eviction
    • SQL Server
    • Logging
    • Monitoring
    • Persistence Data Loading Retries
    • Miscellaneous Configurations
  • Bridge Server Settings
  • Cache Client Settings
  • Client Cache Settings
  • Configure Security
    • Configure Authentication and Authorization
    • Configure Encryption for Cache
    • Configure TLS Encryption
    • Configure HTTPS for NCache Management Center
  • Configure Bridge for WAN Replication
    • Create Bridge
    • Add Clustered Caches to Bridge
    • Configure Bridge Settings
    • Change Cache Synchronization Modes
    • Bridge Management
    • Synchronize Caches in Bridge
    • Leave Bridge
    • Remove Cache from Bridge
    • Configure Conflict Resolver
  • Setup Database for Cache Synchronization
    • Setup SQL Server Environment
    • Setup Oracle Database Environment
    • Setup OleDb Environment
    • Setup SQL Server for CLR Procedures
  • Simulate NCache Usage
  • Monitor Caches
    • Counters
      • Distributed Cache Counters
      • Distributed Cache with Persistence Counters
      • Pub/Sub Messaging Cache Counters
      • Distributed Lucene Cache Counters
      • Cache Client Counters
      • Bridge Counters
    • Monitor NCache using the NCache Management Center
      • Using Tabular Statistics
        • Configure Counters to Display Caching Statistics
        • Configure Counters to Display Pub/Sub Statistics
        • Configure Counters to Display Lucene Statistics
        • Configure Counters to Display Bridge Statistics
        • Browse Cache Statistics
        • Monitor Bridge
      • Using Monitoring Dashboards
        • Configure Monitor Settings
        • Configure Event Logging
        • Configure API Logging
        • Monitor with a Built-In NCache Monitor Dashboard
        • Monitor with the NCache Monitor Custom Dashboard
        • Monitor Cluster Connectivity
        • Monitor Cache Clusters using NCache Email Alerts
    • Monitor Cache Using Command Line Tools
      • Monitor Cache Server Statistics with Command Line Tools
      • Monitor Cache Client Statistics with Command Line Tools
    • Monitor NCache Using Windows PerfMon Tool
      • Monitoring Cache Server Counters using PerfMon
      • Monitoring Cache Client Counters using PerfMon
      • Monitor Bridge Counters Using PerfMon Tool
    • Monitor NCache using Prometheus
    • Monitor NCache using Grafana
    • Monitor NCache Using SNMP Counters
    • Monitor NCache Using JMX Counters
    • Logging
      • NCache Log Viewer
      • Performance Counters Logging
      • Windows Event Logging
      • Cache Health Alerts
      • Email Notifications on NCache Events
      • Cache Server Logging
      • Client Side API Logging
      • Cache Event IDs
      • Feature Usage Logging
    • Troubleshooting NCache Monitoring
      • Computer Name Not Found
      • Diskperf Not Installed
      • No READ Access to Perflib Subkeys
      • Unable to Connect to Remote Server
    • IPV6 Support

Separate Cache Host Process

Previously, the NCache Service and all cache instances were confined within one single process. This meant that if the process crashed, the service along with the caches and their resource information (memory, addresses, ports) were lost.

NCache has now provided more reliability by dedicating a separate process to the service and a devoted process to each cache host.

Note

This feature is also available in NCache Professional.

Client Communication with the Cache

The initial communication of the client with a cache host is a 2-hop communication:

  • It first interacts with the service, which connects the client to the cache host using the port forwarding mechanism.

  • It then communicates with the cache using port forwarding. All future interactions for the client are made directly with the cache.

When a cache is started in its own separate process, it is assigned a Management Port on which the service will communicate with it. This port is dynamically generated from a range (default 8300 – 8400, configurable in service.exe.config).

Note

Note that in case of the Partition-Replica topology, two ports will be assigned.

Once the port has been forwarded, the client will send all cache requests to the cache, like adding items to the cache, or fetching or removing them from the cache.

In case one of the cache host processes stops, the ports being used by that cache for communication are added back to the pool of available ports. For example, if a Partition-Replica node was using ports 8301 and 8302 and the process terminates, the ports will become available for use by any other cache. Now when a process starts for a new cache, port 8301 can be reused for this cache.

Formerly, once a port was assigned to the cache, it was considered as utilized - regardless of the cache state. This meant the port range was narrowed down involuntarily.

Server Communication with the Cache

The server communicates with the cache host on the Management Port that is dynamically generated. All management operations are channeled through this pathway.

What if the Service Restarts?

In the case where the service restarts, the cache processes will not be lost but the need to rediscover their previous states will arise. This means that the service has to ensure which caches were running before it crashed, along with their credentials like Process ID, Port, and so on. This rediscovery, as a result, warrants that the cache processes are not in a zombie state.

There are two tools used for rediscovery:

Windows Management Instrumentation Service (WMI)

A standardized service to access, consolidate, and share management information of devices, applications, and servers in an enterprise environment. You can either run the winmgmt.exe tool or the command line tool wmic to get information regarding the service.

Example:

wmic PROCESS WHERE (Description=”Alachisoft.NCache.Service.exe”)

You can work with multiple other commands using the Windows Management Instrumentation Command Line Tool.

netstat tool

This command-line tool displays network connections for incoming and outgoing TCP communications, routing tables, and network protocol statistics. You can rediscover your lost information about the caches by viewing the active connections and ports being utilized. Any ports within the port range of service.exe.config will indicate the cache hosts using the ports.

Example:

netstat –o will display the local address, foreign address, state, and Process ID of each active connection.

More details regarding this tool can be obtained from Microsoft’s Technet page.

See Also

Graceful Node Down
Self Healing Dynamic Clustering
IP Binding with Multiple NICs
Split Brain

In This Article
  • Client Communication with the Cache
  • Server Communication with the Cache
  • What if the Service Restarts?
    • Windows Management Instrumentation Service (WMI)
    • netstat tool
  • See Also

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