Runtask dcommand denizen not working10/29/2023 Once the JSON arguments are base-64 encoded, they can be passed as the sole parameter to the HTTP get request. In order to successfully invoke the TAC API, the JSON objects shown in the samples above must be base-64 encoded. Once the browser HTTP get message is sent, you can monitor the progress of in the Execution History. Then paste the resulting base64 encoded string as shown below into the browser. You can use the to do this as shown below. Now that we have the taskId we can invoked the job, but we first need to base-64 encode our JSON arguments. Go to the Job Conductor, select any of the columns, and then make sure the Id column is checked so that it will be displayed. When working interactively we can use the TAC to display the taskId. When we use the TAC API programmatically we will use the getTaskIdByName operation. The first thing we need to know is the taskId of the job conductor entry we want to run. When working with the metaservlet API interactively as a developer, it can be useful to interactively invoke the TAC API. Running the MetaServletCaller with no arguments shows the top level help messageĭescription : Get task id by given taskName There is a similar MetaServletCaller.sh script for linux. On windows the full default path is C:/Talend/5.6.2/tac/apache-tomcat/webapps//WEB-INF/classes/MetaServletCaller.bat. The TAC commandline is available in the WEB-INF/classes directory within the TAC directory. While the metaservlet documentation is included in Appendix B of the TAC User’s Guide, the detailed operations are documented in the TAC commandline itself. All parameters to the operation are encoded as a single, unnamed base-64 encoded parameter to the get request. But it is very easy to use, and it can be easily wrapped with a RESTful interface if desired.Īll TAC metaservlet operations are invooked via an HTTP get request. The TAC metaservlet API is documented in the TAC User’s Guide. The TAC is included in all enterprise subscriptions. The TAC API provides a very simple and powerful alternative. So while exported Jobs provide flexibility, they sacrifice manageability. As individual solutions proliferate the management of the broader system becomes more difficult and the maintenance tail becomes more unwieldy. Instead, these responsibilities fall on the developer. There is no concept of Job Servers or a Job grid. The resulting Jobs are run in isolation and lack the monitoring, management, and control provided by the TAC. But there are drawbacks to this approach. The generated zip files will include windows and linux scripts for launching, the they with contain all necessary jars. One option is to build Jobs as self-contained zip files. It is preferable to be able to pass parameters via an API. But when the job is run it is always run with the same set of pre-configured Context variables, whether they are the default values or the overridden values, they cannot be changed without human intervention. Context variables can be overridden by system administrators in the Job Conductor to provide additional flexibility. Jobs can also be parameterized with Context variables. It is preferable to be able to invoke a Talend Job via a real API. Using file triggers as the mechanism for inter-process communication is clunky at best, and may also require access privileges which are not allowed in a secure environment. With exception of the file trigger, the job is still running at a pre-determined time or with explicit human intervention. Finally, jobs can launched by the TAC operators manually from the browser. Jobs can also be triggered by a file trigger. The schedule can be a simple schedule or a more complex Cron schedule. The Job Conductor is easy to use and powerful, but it has limitations. It provides sample jobs, some useful browser utilities, and an example of a wrapping the TAC API in a RESTful service layer using Data Services. This post covers how to expose Talend Jobs via the TAC API. But many times it desirable to have programmatic control of Jobs via an API. The Talend Administration Center (TAC) provides a browser management interface. Talend Jobs are scheduled via the Job Conductor and they are parameterized with Context variables.
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