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Sitefinity using MySQL very slow on restarts

18 posts, 0 answered
  1. Mike Ripplinger
    Mike Ripplinger avatar
    10 posts
    Registered:
    11 Sep 2008
    11 Aug 2010
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    We're experiencing a very weird issue with Sitefinity paid edition (version 3.7.2096.2:1) and MySQL 5.1.  Anytime Sitefinity's application pool is restarted, it takes approximately 10 minutes before the site becomes responsive.  This is the chain of events that we have consistently noticed:

    * Sitefinity's application pool is restarted.
    * We then open a web browser and request a page from our Sitefinity website.
    * The browser sits and attempts to reach the site.
    * While this is happening, we log in to MySQL Workbench and run "SHOW PROCESSLIST" on our MySQL server to see what its current activity is.
    * In the "SHOW PROCESSLIST" results we see a connection from the web server's IP address, using the MySQL user account Sitefinity is setup to use, connecting to the Sitefinity database.  The value in the "Command" column is "Sleep."  The "State" and "Info" columns are blank.  The "Time" column is the number of seconds the connection has been in the "Sleep" command.
    * By continuing to re-execute the "SHOW PROCESSLIST" command we see that approximately 7 seconds later, another connection identical to the one above except on a different port (X.X.X.X:61224 instead of X.X.X.X:61223 for example) is established.
    * New connections, identical to the above except on a different port, continue to be established about every 7 seconds.  As connections continue to be established a clear pattern emerges as the value in the "Time" column for the first connection will be 49, the second 42, the third 35, the fourth 28, the fifth 21, etc.
    * During this time, MySQL remains otherwise responsive.  Via MySQL Workbench, I can run queries on the data with no slowness or lag time.  The server's processor sits at only about 1% utilization and memory also remains fine.
    * New connections from the Sitefinity web server's IP address continue to be established every 7 seconds until about 100 connections have been made.
    * At that time, none of the established connections go away, but the value in the "Time" column for every single one of them drops to somewhere between 1-3.  Also, when you return to the browser window that has been dutifully attempting to load the Sitefinity page the entire time, it now shows an ASP.NET error indicating the request timed out.  As far as I've been able to tell, the appearance of the "request timed out" error seems to coincide almost perfectly with the "Time" values on all the established connections dropping back down to 1-3 and with no more connections being established.
    * At this point if another attempt is made in the browser to load a page from the site, it works fine and from this point forward, the site is and remains normally responsive.

    The above scenario takes place regularly each and every time we restart the Sitefinity application pool, or anytime a change that prompts a rebuild of the site is made, such as an edit to web.config.

    Our setup is we have two web servers and each one has its own associated database server running MySQL.  MySQL on the first database server is a replication master pushing data to the slave on the second database server.  However, we have also tested with a third web server and a third database server running MySQL with no replication configured at all and we experience the same problem.  Additionally, we created a new Sitefinity site (same version) and pointed it to a new MySQL database on a different server and tested this scenario before adding any content to Sitefinity.  We received the same results.

    We also tested by exporting the data from our MySQL Sitefinity database to a clean MS SQL Express Edition Sitefinity database and then pointed the same website at the MS SQL database instead of MySQL.  Under this scenario, the site is immediately responsive again with no lag time after restarting the application pool.

    Do you have any ideas on what we can do so that restarts of the Sitefinity application pool will stop rendering the site unresponsive for 10 minutes but that will still allow us to use MySQL as our database?  Thanks in advance for any help you can provide!

    Mike
  2. Georgi
    Georgi avatar
    3583 posts
    Registered:
    28 Oct 2016
    17 Aug 2010
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    Hello Mike Ripplinger,

    We are very sorry to hear that there are issues with the setup. 
    We do not have something like that logged or reproduced yet. We will try to isolate the problem with your help first, before we ask for your project and test it locally. Have you checked the log file, if there is any error logged there when Sitefinity initializes a new connection? Are you working with the latest version?

    Greetings,
    Georgi
    the Telerik team
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  3. Mike Ripplinger
    Mike Ripplinger avatar
    10 posts
    Registered:
    11 Sep 2008
    17 Aug 2010
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    Thanks for your reply.  We're using version 3.7 SP3, which we believe to be the latest version. If there is a different version we should be using, please let us know.

    We have checked the sitefinity.log file and there are no errors reported when Sitefinity initializes a new connection.  The only errors that appear during a slow restart are "Request timed out" errors such as this:

    Exception Type: System.Web.HttpException

    Message: Request timed out.

    Source:

    Stack Trace:


    Thanks in advance for your help with this and please let me know if you need any additional information.
  4. Georgi
    Georgi avatar
    3583 posts
    Registered:
    28 Oct 2016
    19 Aug 2010
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    Hi Mike Ripplinger,

    Thank you for your reply. 
    We have tested this morning Sitefinity 3.7SP3 with MySQL 5.1.49. Everything works as expected - 6 connections were opened to the server and the responsiveness is in normal ranges.
    Is there a way for you to update one of your test mysql servers? Could you also check if you have some custom functionality that makes database calls at startup? We didn't see anything causing reconnect on every 7 seconds. 

    Greetings,
    Georgi
    the Telerik team
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  5. Mike Ripplinger
    Mike Ripplinger avatar
    10 posts
    Registered:
    11 Sep 2008
    19 Aug 2010
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    Georgi:

    I ran some new tests this morning and here are the results.

    * MySQL 5.1.49 was unavailable from the MySQL website, so I installed MySQL Community 5.1.50.
    * I then copied the extracted contents of Sitefinity_3_7_2096_standard_trial_BlankProject.zip to a web-accessible folder on the same server as the one running MySQL.
    * I made the web folder where Sitefinity files reside an application in IIS, assigned it to an application pool, and performed all steps necessary to get it ready to run as an ASP.NET website.
    * In MySQL Workbench as root, I created a database for Sitefinity to use and created a Sitefinity MySQL user.  I then performed a GRANT ALL to my Sitefinity user on my Sitefinity database.
    * I opened http://localhost/CleanSitefinity/ in a browser to launch Sitefinity startup.
    * I entered my database credentials, All seemed to work fine and I was eventually given the Sitefinity login screen.
    * Before logging in, I used MySQL Workbench to verify that the tables and other Sitefinity database objects were now in the database.  While I did not perform an exhaustive table by table search, there were Sitefinity tables and objects in the database so it looks like all worked OK.
    * I logged into Sitefinity with the Sitefinity admin account I created.  After several minutes an ASP.NET "System.Web.HttpException: Request timed out" error appeared.
    * I reloaded the login page and again entered credentials; after several minutes an ASP.NET "System.Web.HttpException: Request timed out" error appeared.
    * I then used MySQL Workbench to execute a sample query against Sitefinity database (SELECT * FROM telerik_users;); this worked fine.
    * I restarted the MySQL service, restarted Sitefinity's application pool, and tried again.
    * After several minutes an ASP.NET "System.Web.HttpException: Request timed out" error appeared.

    The following two errors were written to Sitefinity.log every time I received the "Request time out" errors mentioned above:

    8/19/2010 11:19:56 AM [EXCEPTION]
    ************************************************************************************
    ID: 0b44fd58-7b3f-476c-b282-d9bab1cecbb3; Code: 100103; Occurrence: 1; Sequence: 3
    ------------------------------------------------------------------------------------

    Application information:
     Machine name: VS-DB1
     OS Version: Microsoft Windows NT 6.0.6002 Service Pack 2
     Product Version: 3.7.2096.2
     Application Path: C:\inetpub\wwwroot\CleanSitefinity\
     Debug: False

    Process information:
     Process ID: 3760
     Process Name: w3wp

    Request information:
     Request URL: /CleanSitefinity/Sitefinity/Admin/Default.aspx
     Rewrite URL: http://localhost/CleanSitefinity/Sitefinity/Admin/Default.aspx
     Url Referrer:  Is Authenticated: True
     Authentication Type: Forms
     User: admin
     User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729)
     User Address: ::1

    Variables:
     AspSession: System.Web.SessionState.HttpSessionState
     RadControlRandomNumber: 0
     AspSessionIDManagerInitializeRequestCalled: True
     CmsHttpRequest: /CleanSitefinity/Sitefinity/Admin/Default.aspx

    - L0 -------------------------------------------------------------------------------

    Exception Type: System.Threading.ThreadAbortException

    Message: Thread was being aborted.

    Source: System

    Stack Trace:
       at System.Net.UnsafeNclNativeMethods.OSSOCK.recv(IntPtr socketHandle, Byte* pinnedBuffer, Int32 len, SocketFlags socketFlags)
       at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, SocketError& errorCode)
       at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
       at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
       at System.IO.BufferedStream.ReadByte()
       at MySql.Data.MySqlClient.MySqlStream.LoadPacket()
       at MySql.Data.MySqlClient.MySqlStream.OpenPacket()
       at MySql.Data.MySqlClient.NativeDriver.ReadResult(UInt64& affectedRows, Int64& lastInsertId)
       at MySql.Data.MySqlClient.MySqlDataReader.GetResultSet()
       at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
       at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
       at MySql.Data.MySqlClient.MySqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
       at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader()
       at NNMySQLProvider.MySQLStmtBuilder.HasProcedure(ObjectName procedureName)
       at Nolics.ORMapper.DataProviders.SQLBlockBuilder.DefineCommandProcedure(OdbClassInfo dbclassInfo, SQLCrudOperations operation)
       at Nolics.ORMapper.DataProviders.SQLBlockBuilder.DefineClass(OdbClassInfo dbClassInfo, EmitPhases phase)
       at Nolics.ORMapper.DataProviders.SQLDataProvider.GetSchemaChanges(Boolean fRename)
       at Nolics.ORMapper.Base.OdbDataProvider.Upgrade()
       at Telerik.Forums.Data.DefaultProvider.Initialize(String name, NameValueCollection config)
       at Telerik.ManagerBase`1.InstantiateProvider(ProviderSettings providerSettings, Type providerType)
       at Telerik.ManagerBase`1.InstantiateProvider(ProviderSettings providerSettings)
       at Telerik.ManagerBase`1.InstantiateProviders(ProviderSettingsCollection configProviders)
    ------------------------------------------------------------------------------------

     

    8/19/2010 11:19:56 AM [UNKNOWN]
    ************************************************************************************
    ID: 36b245a3-e1be-4263-800a-0a95fcc032ea; Code: 3001; Occurrence: 1; Sequence: 4
    ------------------------------------------------------------------------------------

    Application information:
     Machine name: VS-DB1
     OS Version: Microsoft Windows NT 6.0.6002 Service Pack 2
     Product Version: 3.7.2096.2
     Application Path: C:\inetpub\wwwroot\CleanSitefinity\
     Debug: False

    Process information:
     Process ID: 3760
     Process Name: w3wp

    Request information:
     Request URL: /CleanSitefinity/Sitefinity/Admin/Default.aspx
     Rewrite URL: http://localhost/CleanSitefinity/Sitefinity/Admin/Default.aspx
     Url Referrer:  Is Authenticated: True
     Authentication Type: Forms
     User: admin
     User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729)
     User Address: ::1

    Variables:
     RadControlRandomNumber: 0
     AspSessionIDManagerInitializeRequestCalled: True
     CmsHttpRequest: /CleanSitefinity/Sitefinity/Admin/Default.aspx

    - L0 -------------------------------------------------------------------------------

    Exception Type: System.Web.HttpException

    Message: Request timed out.

    Source:

    Stack Trace:

    ------------------------------------------------------------------------------------


    There is no custom functionality that makes database calls during startup because this was all done with a clean, unchanged Sitefinity installation using Sitefinity_3_7_2096_standard_trial_BlankProject.zip.

    Please let me know what I should try next.  Thanks!
  6. Radoslav Georgiev
    Radoslav Georgiev avatar
    3370 posts
    Registered:
    01 Feb 2016
    20 Aug 2010
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    Hi Mike Ripplinger,

    Thank you for getting back to us with the detailed information on your tests.

    The problem that you are experiencing is because when you log in for the first time in Sitefinity the CMS still has to create some tables and database objects as a whole. When you create the project for the first time not all database objects are created. However when you login for the first time the system completes its initialization. The problem is that when using MySQL the SQL server takes longer time to create all necessary objects than the default http response timeout of the IIS server (default value is 110 seconds). You can however edit the config of the Sitefinity website to allow for longer http response time:
    <httpRuntime maxRequestLength="51200" executionTimeout="180" />


    Kind regards,
    Radoslav Georgiev
    the Telerik team
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  7. Mike Ripplinger
    Mike Ripplinger avatar
    10 posts
    Registered:
    11 Sep 2008
    20 Aug 2010
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    Thank you for the tip.  I added the "executionTimeout" attribute to my test site's web.config's httpRunTime element and this allowed me to login to my test Sitefinity site.  I then created a new page, named it Home.aspx, and set it to be the home page.  I was able to view it in a browser.  I then added a comment to my web.config file to trigger a site reload and after about 7-10 seconds, the site successfully reloaded.  So I would now say that my test site works as expected.

    Next I added the "executionTimeout" attribute to my production site's web.config file.  Making the change to web.config triggered a site reload but unfortunately, rather than having it return to responsiveness in 7-10 seconds, it took 10-12 minutes for it to return, as described in my initial report.  So while my test site is working as expected, my production site is still not.

    But this gave me the opportunity to compare my test site's database to my production site's database and I noticed several differences.  Here are the differences I noted between the two databases:

    Tables in my production site's database but not my test site's database:
    sf_versionitem
    sf_versvariables
    sf_vrsbindata
    sf_vrslockeditems
    sf_vrstextdata

    Routines in my production site's database but not my test site's database:
    sf_GetLastVersion
    sf_GetVersionItems
    sf_VersionItem_del (and _ins, _pkq, and _upd)
    sf_VersVariables_del (and _ins, _pkq, and _upd)
    sf_VrsBinData_del (and _ins, _pkq, and _upd)
    sf_VrsLockedItems_del (and _ins, _pkq, and _upd)
    sf_VrsTxtData_del (and _ins, _pkq, and _upd)

    Routines in my test site's database but not my production site's database
    NN_GetVersion

    I did not compare the actual schema of any tables/routines in the database.  I just performed an eyeball check to see which items were in one database but not the other. Also note that while my test site is using MySQL 5.1.50, my production site is still using MySQL 5.1.45.  As for Sitefinity version, both sites were created using the same Sitefinity version (Sitefinity_3_7_2096_standard_trial_BlankProject.zip).

    Does this information help shed any light on what may be causing my production site to take so long to restart?
  8. Radoslav Georgiev
    Radoslav Georgiev avatar
    3370 posts
    Registered:
    01 Feb 2016
    23 Aug 2010
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    Hello Mike Ripplinger,

    The tables and stored procedures which are missing in the database schema will be created automatically when you create content items in the modules of the system. Those tables pertain versioning information about each content item, as well as status and if the item has been locked by an user. You have mentioned in a previous ticket/thread of yours that you are running multiple servers with MySQL db replication in place, so could this be the case that the website is not responding - for example you have on e of your webservers running a different version of Sitefinity and each time it is restarted it performs a db upgrade/downgrade causing a slow down in initialization? Or this website is not set up this way?

    All the best,
    Radoslav Georgiev
    the Telerik team
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  9. Mike Ripplinger
    Mike Ripplinger avatar
    10 posts
    Registered:
    11 Sep 2008
    02 Sep 2010
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    Thanks for your reply.  To answer your question, we are running multiple servers with MySQL database replication in place, however the Sitefinity versions on both servers definitely match because we have third-party file replication software in place that copies any changes made on Server1 over to Server2.

    Also, you said that the tables and stored procedures that are missing from my test database will be created automatically when I create content items in the modules of the system.  On my test "clean" system, I have created a test page.  Is this not enough to create these missing objects?  What content do I need to create to cause these missing objects to be created?

    Building off of the differences I noted between my production database and my test database, I ran an experiment today.  I took a backup of my production database (we'll call it sitefinity_production) and restored it to a new database (we'll call it sitefinity_production_new).  I then attempted to make sitefinity_production_new "look" like the test database I alluded to earlier by adding to sitefinity_production_new the NN_GetVersion function that is found in my test database but not on my production database, and by removing the tables and routines I listed earlier that are found in my production database but not in my test database.  I attempted to make these changes manually via MySQL Workbench.

    I tried to add the function NN_GetVersion to sitefinity_production_new by issuing the following statement against the database:

    CREATE FUNCTION `NN_GetVersion`() RETURNS bigint(20)
    BEGIN
        DECLARE CurValue bigint;
        SELECT CounterValue INTO CurValue FROM `sitefinity_production_new`.`NN_Counters` WHERE CounterID = 'VERSION';
    RETURN CurValue;
    END

    As soon as I executed this statement, I received the following error:

    ERROR 1418: This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)

    Binary logging is indeed enabled on our MySQL servers to support replication, but it is not enabled on my test system.  Once I encountered this error I did not attempt any more efforts to make sitefinity_production_new look like my working clean test database.

    Do you think this error could be the cause of our lengthy restart process?
  10. Radoslav Georgiev
    Radoslav Georgiev avatar
    3370 posts
    Registered:
    01 Feb 2016
    03 Sep 2010
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    Hello Mike Ripplinger,

    Pages and content items are stored in different tables of the system. So creating a page will not create all tables. You also have to create one item in generic content based modules, and other modules to initialize all components of the system properly.

    Unfortunately I am not an expert on MySQL and would need more time do perform a research and thorough testing in order to make a conclusion whether the error you have encountered may cause slow downs on site initialization. Generally you can bypass this error by setting log_bin_trust_function_creators to 1 so that functions do not have to declared as DETERMINISTIC, NO SQL, or READS SQL DATA when binary logging is enabled. Can you test with setting the above mentioned setting.

    Thank you very much for your cooperation. In the meantime I will perform a further research on the issue.

    Regards,
    Radoslav Georgiev
    the Telerik team
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  11. Mike Ripplinger
    Mike Ripplinger avatar
    10 posts
    Registered:
    11 Sep 2008
    10 Sep 2010
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    I set log_bin_trust_function_creators to 1 on both of our MySQL servers and restarted the application pool on one of our web servers to see if it would reduce the time necessary to fully restart.  Adding this setting to our my.ini file had no effect.

    Please let me know what I should try next.  Thanks!
  12. Radoslav Georgiev
    Radoslav Georgiev avatar
    3370 posts
    Registered:
    01 Feb 2016
    15 Sep 2010
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    Hi Mike Ripplinger,

    Thank you for getting back to us.

    After adding this value did you notice if the stored procedures missing on the production version were created when restarting the website? My presumption is that procedures previously missing in the production DBs (as compared to the test database) will not get created automatically. This requires that a database upgrade is forced on those servers. A database upgrade is forced if you go to the sf_secvariables table and set the value of SchemaVersion row to a value different of your Sitefinity version. For example if you are using Sitefinity 3.7 SP3 the value will be 2096. Setting this to 1 and restarting the website will force the ORM to perform a database upgrade and make sure that db objects matching current version.

    Do you have a way of testing this locally - to see if subsequent restarts will spool up faster?

    Sincerely yours,
    Radoslav Georgiev
    the Telerik team
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  13. Mike Ripplinger
    Mike Ripplinger avatar
    10 posts
    Registered:
    11 Sep 2008
    15 Sep 2010
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    After adding the log_bin_trust_function_creators setting to MySQL, I did check and the NN_GetVersion routine was not added to my production database.

    I do not have a local test system with two replicated MySQL servers, but I can remove one server set (web and database) from load balancing at a time and so I tested your further reccommendations on my production system after making a database backup.  I located the SchemaVersion row in sf_secvariables and found the value there to be 2096, just as you wrote.  I updated the database to set this value to 1 and then restarted the website.  The same slow restart process ensued and when it was over the SchemaVersion row in sf_secvariables was once again 2096, the NN_GetVersion routine was still missing, and the tables and routines I previously identified as being in my production database but not in my test database were still present in my production database.  I then restarted the website again to see if a subsequent startup would be any different and it was not; it was still very slow.

    Please let me know what I should try next, and thanks again for your continued help with this one!
  14. Radoslav Georgiev
    Radoslav Georgiev avatar
    3370 posts
    Registered:
    01 Feb 2016
    21 Sep 2010
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    Hi Mike Ripplinger,

    Have you tried creating the stored procedure manually when you have set the creators value to allow creation of stored procedures?


    Kind regards,
    Radoslav Georgiev
    the Telerik team
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  15. Mike Ripplinger
    Mike Ripplinger avatar
    10 posts
    Registered:
    11 Sep 2008
    25 Oct 2010
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    Hi there -- sorry for my delayed reply.  I have tried creating the stored procedure manually when I have set the creators value to allow creation of stored procedures.  The procedure gets created, however the slowness issue as originally reported remains.  Please let me know what I should try next, and thanks again for your continued help with this one.
  16. Radoslav Georgiev
    Radoslav Georgiev avatar
    3370 posts
    Registered:
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    01 Nov 2010
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    Hi Mike Ripplinger,

    Unfortunately I am running out of suggestions here. We have been testing similar setup here however without much results. I guess it would be worthwhile checking if the databases are suing different storage engines.

    Best wishes,
    Radoslav Georgiev
    the Telerik team
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  17. Mike Ripplinger
    Mike Ripplinger avatar
    10 posts
    Registered:
    11 Sep 2008
    02 Nov 2010
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    The databases are using the same storage engine.

    Thanks for your help.  We do appreciate it!  Most likely we'll simply move from MySQL to SQL Server.
  18. Radoslav Georgiev
    Radoslav Georgiev avatar
    3370 posts
    Registered:
    01 Feb 2016
    03 Nov 2010
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    Hi Mike Ripplinger,

    I am really sorry we have not been able to help much on this issue. If you find something more on this issue please feel free to share it with us.

    All the best,
    Radoslav Georgiev
    the Telerik team
    Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items
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