Rerunning Package With Parallel Tasks

Jun 26, 2007



Hello,



I have done a search and have read some of the posts, but am left more confused than before. I am fairly new to SSIS. Here is my situation and what i am trying to accomplish.



I have a package that has a sequence container, in which there are multiple SQL tasks (about 20) running in parallel. I have checkpoints enabled, and FailPackageOnFailure enabled as well. If the package fails, when i re-run the package it will run the last task as well as all the other tasks. What I am looking to accomplish is when the package is re-run, have the SQL tasks that failed ran and not the previous successful tasks.



I think the best way would be via disabling tasks on successful completion of a task, where it writes the name of the SQL task to a temp table, but I am skeptical.



Can anyone point me in a direction to help me accomplish what I am looking for please.



Thanks in Advance.

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Problem With WMI Tasks : Waiting For Files In Parallel In A SSIS Package

May 28, 2007

Hi,



I have a problem with the task "event watcher".



I've made a query like the one in msdn (SELECT * FROM __InstanceCreationEvent WITHIN 10 WHERE Targetinstance ISA "CIM_DirectoryContainsFile" and TargetInstance.GroupComponent= "Win32_Directory.Name="e:\\temp""). I have 20 similar tasks for watching in different folders, but when there are too much tasks in parallel, it doesn't work anymore. I change the numbers of executables to 128 (in the general properties of the package (to test)) but it doesn't seems to work.

I don't understand why it works when there are only 1 or 2 (6 seems to be the maximum) tasks and not if there are more than 6.



Could you help me with this issue?



Configuration : Windows Server 2003, SQL Server 2005, SSIS, Sql Server Agent



Thanks a lot.



Julien.

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Mar 29, 2006

I have three SQL tasks executing in parallel in an Integration Services package.

  +-B-+
A-+-C-+-E
  +-D-+

It starts with task A; then B, C, and D all execute in parallel; and finally task E runs after BCD are done.

B, C, and D are all Execute SQL tasks, all with the same connection manager. Here is their code:

B) SELECT CASE WHEN COUNT(*) = 0 THEN 0 ELSE 1 END AS Process
     FROM temp_B

C) SELECT CASE WHEN COUNT(*) = 0 THEN 0 ELSE 1 END AS Process
     FROM temp_C

D) SELECT CASE WHEN COUNT(*) = 0 THEN 0 ELSE 1 END AS Process
     FROM temp_D

Each one is setting a binary value to a package variable (using Result Set settings) based on the count of records from different tables.

This works with no problems when I run it against one server (development). But when I switch to the production server, task B and D both fail. I'v checked to make sure all of the temp tables exist in the database for that connection manager and that all three have the same connection manager - all is okay.

Here's the trickier part. When I'm still pointing to the production server and I run these tasks individually, they are all successful. It is only when they are attempting to run in parallel that they fail.

Here is the Output error:
Error: 0xC002F210 at Process Med?, Execute SQL Task: Executing the query "SELECT CASE WHEN COUNT(*) = 0 THEN 0 ELSE 1 END AS Process FROM temp_B" failed with the following error: "Invalid object name 'temp_B'.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.

What could be causing this? I'm at a loss.

 

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Oct 24, 2006

Hi,

I have a master package with a sequence container with around 10 execute package tasks (for child packages), all in parallel. Checkpoints has been enabled in the master package. For the execute package tasks FailParentOnFailure is set to true and for the sequence container FailPackageOnFailure is set to true.

The problem i am facing is as follows. One of the parallel tasks fails and at the time of failure some of the parallel tasks (say set S1) are completed succesfully and few are still in execution (say set S2) which eventually complete successfully. The container fails after all the tasks complete execution and fails the package. When the package is restarted the task which failed is not executed, but the tasks in set S2 are executed.

If FailPackageOnFailure is set to true and whatever be the FailParentOnFailure value for the execute package task, in case of restart the failed package is executed but the tasks in set S2 are also executed.

Please let me know if there is any setting that only the failed task executes on restart.



Thanks in advance

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Aug 23, 2006

Hi

I have a SQL Server 2000 instance running on a Windows Server 2003 box with 4 processors. SQL Server is configured to use all 4 processors, and use all available processors for parallelism.

I have created a simple DTS package which has 2 "execute external process" tasks with no precedence constraints between them. There are no connections required or defined for the two tasks (sequential
processing is forced on tasks sharing connections). The DTS package
properties have the "limit the number of tasks to execute in parallel"
set to 4.

However, despite the above configuration, the two steps are never executed in parallel, but always sequentially.

Does anyone have any ideas as to why these tasks are not being executed in parallel?

Any suggestions welcome.

Thanks.

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1. in maintenance plan, if we add tasks which are not joined, will they run in paralled at the same time
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the business requirement behind this is to bring data from multiple servers into shadow copies locally and then process them together. its ok if some server data transfer fails, but its not ok to start processing centrally while data transfer is going on. further, we want to run data transfer from multiple servers in paralleled to save time.

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Feb 19, 2008



Scenario

I have a package that is doing some file transformation (Text, XML, and Excel) job based on a variable value. This package is called by a Parent package, where I am calling this package parallel through a script Task. So there are three parallel script task and all variables are local to script task.



In Script Task I am assigning value to child package variable using following code.



packToLaunch = appLaunch.LoadPackage("SSISPackage.dtsx", Nothing)

For iVarCtr = 0 To Dts.Variables.Count - 1

VarName = Dts.Variables(iVarCtr).Name

packToLaunch.Variables(VarName).Value = Dts.Variables(VarName).Value

Next

Dts.TaskResult = packToLaunch.Execute()



Problem1

Out of three packages some are getting failed saying variables not found in collection.

To read a variable in child package I am setting it to ReadOnlyVariables List of Script Task.

In some places I am using following code



object objValue = null;

Microsoft.SqlServer.Dts.Runtime.Variables variables = null;

if (varDispenser.Contains(variableName))

{

varDispenser.LockOneForRead(variableName, ref variables);

objValue = variables[variableName].Value;

if (variables.Locked) variables.Unlock();

}

return objValue;







Problem2

I have created a hash table in child package and stored in a package variable through a script task.

When trying to access the variable through a custom task, in some of threads it€™s returning me System.Object not System.HashTable.





Both the problems are working fine on a single processor machine, it starts giving errors on multi processor 64 bit machine.



Need Urgent Help!!!!!



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In another case, I truncated each destination table before running the package and the package runs fine.

Are toes being stepped on in the data flow task and causing a deadlock?

Update: I removed the sort transformation and sorted the rows before pushing them to the recordsets and I still get the same results.

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Thanks in advance in reading this thread.



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I have attached the an lousing .jpeg.

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Thanks in Advance.

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Thanks in advance,





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$wapnil

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