Intermittent StackExchange.Redis.RedisTimeout Exception in Sitecore

-

I was encountering frequent time-out issues with Redis and my application deployed on Azure PaaS. Following are the sample exceptions from logs:

redis-timeout-sitecore

Solutions:

I have reviewed config files from our CD server according to Sitecore's recommendation in this KB article here Excessive load on ASP.NET Session State store, and checked some of the points.

  1. In the Web.config and Sitecore.Analytics.Tracking.config files, increase the pollingInterval attribute value on both Private and Shared session state provider definitions from 2 to 60 seconds.
    => For my case, the pollingInterval value is in the Sitecore.Analytics.Tracking.Azure.config file and the value is still 30. I have considered increasing the value further.
  2. In the Sitecore.Analytics.Tracking.config file, find the timeoutBetweenLockAttempts parameter. Increase its value from 10 to 200 milliseconds.
    => The value should be defined in the Sitecore.Analytics.Tracking.config file by default, however, I was not able to find this file in our CD app service. As We are on Sitecore XM instead of XP, we do not have Marketing features and the respective files in our solution.
  3. Changed "aspnet:RequestQueueLimitPerSession" setting value to 25 according to the recommendation. 

I also recommend you to check if the cache tuning is enough or not:

Sitecore uses Redis only for session storage, the data will be transferred to xDB on session timeout. My "redis_read" and "redis_write" connections share the same connection string as "redis.sessions". Since my custom code additionally uses Redis for custom operation, this may impact Sitecore's Redis session if they share one connection string.

  • I have Scaled our Redis and created a different Redis connection exclusively for our custom code. Now we are with two Redis servers, the default is Sitecore Redis, and another is for our Custom Redis.

If your problem persists, then:

  1. Ensure CPU usage is not high. This is a limitation of StackExchange.Redis.
  2. Increase operationTimeoutInMilliseconds from 5000 ms to higher, according to Sitecore's recommendation in this KB article here Redis driver timeout issues 
  3. Scale your Redis.

The last option I can suggest is to collect a few memory dumps when the Redis timeout exception occurs. Refer Sitecore KB article here Collecting A Memory Dump Using Procdump Utility

please consider the following example command to collect the dump:

procdump -accepteula -e 1 -f "StackExchange.Redis.RedisTimeoutException" -ma [Name or PID]

To further analyze the dump file, open it in Microsoft Visual Studio or any third-party tool.

Happy Sitecoreing ðŸ˜Š

Comments

Post a Comment

Popular posts from this blog

Sitecore Installation Error: Failed to Start Service 'Sitecore Marketing Automation Engine'

-
Image
 Error: [------- XConnectXP0_StartServices [2] : ManageService -----------------------] [XConnectXP0_StartServices [2]]:[Updating] sc903xconnect.dev.local-MarketingAutomationService Waiting for service 'Sitecore Marketing Automation Engine - sc903xconnect.dev.local-MarketingAutomationService (sc903xconnect.dev.local-MarketingAutomationService)' to start... Waiting for service 'Sitecore Marketing Automation Engine - sc903xconnect.dev.local-MarketingAutomationService (sc903xconnect.dev.local-MarketingAutomationService)' to start... Waiting for service 'Sitecore Marketing Automation Engine - sc903xconnect.dev.local-MarketingAutomationService (sc903xconnect.dev.local-MarketingAutomationService)' to start... Waiting for service 'Sitecore Marketing Automation Engine - sc903xconnect.dev.local-MarketingAutomationService (sc903xconnect.dev.local-MarketingAutomationService)' to start... Waiting for service 'Sitecore Marketing ...
Read more

Import CSV Data in Sitecore Using PowerShell: Part-3

-
Image
In my previous blog , we had discussed Sitecore PowerShell Command and Scripts. In this blog, I am discussing with you about How to Import CSV Data in Sitecore using PowerShell Scripts? To do the same you need to read the CSV file rows and create Sitecore Items into the Content Tree for each row then assign the column values of the row into the respective Item Field. There are two options: Write your own customized PowerShell Script and Import CSV Data. Use the inbuilt Data Importer tool that comes with Sitecore PowerShell Extension .  Option 1: Perform the Below steps to Import the CSV Data into Sitecore: First, you will need a CSV file. If you have Excel Sheet, then go to the File Menu and click on Save As option and change the format and save it into CSV format. Suppose you have a CSV file with the number of rows and each row has several columns with predefined values. Here I am taking the below CSV file for an...
Read more

Sitecore : The database principal owns a schema in the database, and cannot be dropped message

-
Image
While upgradation to Sitecore 10.2, I was to restore the database on the Managed Cloud Service Azure SQL Server. I have connected the Azure SQL server on my local SSMS and started to import the Database using the option Import Data-tier Application. While importing the database using the above option you need a BACPAC file instead of a .bak file. So I was to create a BACPAC file of the database from my local. Go to the database, right-click and select the Export Data-tier Application option under the Task menu. After clicking on the next, while creating the BACPAC file you may get the below error: Solution: Go to the Users in that Database. Your Database => Security => Users Find the user, right click and delete it. If you are unable to delete the user and encountered a new error as below: It means the user you are going to delete owns a schema in the database and owners. First, you need to search which schemas own...
Read more