We are implementing Spring Batch Jobs,
We need to pass the job parameter from Client/MASTER to SLAVE.
CLIENT/MASTER is where our Job and partitioning code is present. We are calling the JOB using J Unit passing the JOB PARAMETER.
SLAVE is where all the Steps and its implementation(reader Writer and processor) is defined.
We are able to achieve this in a standalone way, but not with Client & SERVER way. I am not sure why we are not able to achieve our set up, where we are able to achieve in Standalone?
We are using Weblogic and Spring Integration along with JMS to Achieve the same
Please assist.
We are able to resolve this issue as below in our bean configuration file:
<property name="load" value="#{jobParameters[load]}"></property>
load is passed from our Shell script
./esk200.sh esk200-context.xml TIMESTAMP load=full
Related
I have a working Spring Boot application which embeds a Spring Batch Job. The job is not run on a schedule, instead we kick it with an endpoint. It is working as it should. The basics of the batch are
Kick the endpoint to start the job
Reader reads from input file
Processor reads from oracle database using jpa repository and simple spring datasource config
Writer writes to output file
However there are new requirements:
The schema of the repository database is from here on unknown on application startup. The tables are the same, it is just an unknown schema. This fact is out of our control and you might think it is stupid but there are reasons for it and this cant be changed. This means that with current functionality we need to reconfigure the datasource when we know the new schema name, and restart the application. This is a job that we will run for a number of times when migrating from one system to another, so it has a limited lifecycle and we just need a "quick fix" to be able to use it without rewriting the whole app. So what I would like to do is:
Send the schema name as a query param to the application, put it in job parameters and then - get a new datasource when the processor reads from the repository. Would this be doable at all using Spring Batch? Any help appreciated!
I have one #Scheduler job which runs on multiple servers in a clustered environment. However I want to restrict the job to run in only in one server and other servers should not run the same job once any other server has started it .
I have explored Spring Batch has lock mechanism using some Database table , but looking for any a solution only in spring task:scheduler.
I had the same problem and the solution what I implemented was a the Lock mechanism with Hazelcast and to made it easy to use I also added a proper annotation and a bit of spring AOP for that. So with this trick I was able to enforce a single schedule over the cluster done with a single annotation.
Spring Batch has this nice functionality that it would not run the job with same job arguments twice.
You can use this feature so that when a spring batch job kicks start in another server it does not run.
Usually people pass a timestamp as argument so it will by pass this logic, which you can change it.
When I use spring task handle a simple sync job! But when I deploy multi-node, how I make sure the cron job just run one time.
Maybe you say that:
1. Use distributed-lock control a flag before the crob job run.
2. Integrated quartz cluster function.
But I hope spring task #EnableScheduling can add a flag argument, so as we can set a flag when launch app.
We are using https://github.com/lukas-krecan/ShedLock with success, zookeeper provider in particular.
Spring boot, in a nutshell, doesn't allow any type of coordination between multiple instances
of the same microservice.
All the work of such a coordination is done by the third parties that spring boot gets integrated with.
One example of this is indeed a #Scheduled annotation.
Another is DB migration support via flyway.
When many nodes start and the migration has to be done, flyway is responsible to lock the migration table by itself, spring boot has nothing to do with it.
So, bottom line, there is no such support and all options that you've raised can work.
I am a newbie in Java and trying to implement a Spring Boot batch application.
My requirement is like to check some data in database (one part) and delete if found (another part).
I am planning to implement Spring Boot batch for this.
I will have one job which will have 2 steps. If Step 1 find some data then only execute step 2? Can I achieve in Spring Boot Batch? Or what is the best way to achieve this keeping in mind I have to schedule this to run weekly.
With just the scheduled job for find and delete records from DB, I don't suggest using Spring Batch. Spring has nice good way of doing it without Batch using scheduling-tasks. You can see example here. Use Spring Batch only if you need to run jobs in batch that can't be handled with normal operation.
If you need complex scheduler, you can use Spring Quartz scheduler.
Part of my job is to poll DB for a specific result status and only after that I can continue with next job's steps.
Is it recommended to stop the job's process while doing polling in one of the steps(tasklet I guess) ?
Polling the DB for a specific result sounds like a situation where you need a scheduler.
Spring-batch assumes the scheduling of the job is done from outside it's scope.
You can use #Scheduled spring annotation if you want to keep all inside spring configuration or use an external tool like this.
If you have more complex situations, have a look at Spring Batch Integration.