Jon Cole JonCole

Summary

Unless otherwise noted, all source code under https://gist.github.com/joncole is licensed using a slightly modified MIT License. Key difference is that you don't have to copy this license with the source code/samples given here.

Modified MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AU

Debugging Redis Keyspace Misses

Simply put, a keyspace "MISS" means some piece of data you tried to retrieve from Redis was not there. This usually means that one of the following things happened:

The key expired
They key was renamed
The key was deleted
The key was evicted due to memory pressure
The entire database was flushed
The key was never actually inserted

Some of the Redis best practices content has moved

This content from this markdown file has moved a new, happier home where it can serve more people. Please check it out : https://docs.microsoft.com/azure/azure-cache-for-redis/cache-best-practices.

NOTE: Client specific guidance listed below is still valid and should still be considered. I will update this document once all content has been moved.

Contents Moved

The contents of this article have moved to a new, happier home https://aka.ms/Redis/DataLoss

Content Moved

The content from this article has been moved to a happier home on our official documentation site - please update your bookmarks.

When contacting us with questions, please provide the following information to enable us to best help you.

Required Information

Cache Name
Date&Time when issue started and ended. Note: A 1-2 hour time window is ideal. If the issue is intermittent, please provide exact times for a few of the errors so that we can correlate with our logs.

Important: Please Specify whether times are in UTC or some other Time > Zone. If you do not clarify the time zone, we don't know what time

	using System.Collections.Generic;
	using System.Diagnostics;
	using System.Linq;
	using System.Net.Security;
	using System.Net.Sockets;
	using System.Security.Authentication;
	using System.Text;
	using System.Threading.Tasks;

	namespace System

	namespace StackExchange.Redis
	{
	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Net;

	public static class StackExchangeRedisExtensions
	{
	public static IEnumerable<IServer> GetMasterServers(this IConnectionMultiplexer connection)

	using System;

	namespace StackExchange.Redis
	{
	static class RedisKeyspaceNotifications
	{
	/// <summary>
	/// NOTE: For this sample to work, you need to go to the Azure Portal and configure keyspace notifications with "Kxge$" to
	/// 1) turn on expiration notifications (x),
	/// 2) general command notices (g) and

	using System;
	using System.Diagnostics;
	using System.IO;
	using System.Runtime.InteropServices;

	namespace System.Diagnostics
	{
	public static class CrashDumpHelper
	{
	/// <summary>