task-executor | Task Executor in Golang | Job Scheduling library
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QUESTION
I am doing Spring Integration with Server and Client request/response demo. The request comes with a Byte array which is to be converted to Object. Then the request comes to the input channel, I need to check which class is to be send to the service activator. Then the service activator will send it to the reply channel.
...ANSWER
Answered 2021-Sep-28 at 13:09QUESTION
I have the following task executor which is used to run a 10s sleep time tasklet with partitions:
...ANSWER
Answered 2021-Jul-07 at 10:37Indeed I do not reproduce with your code sample. Here is an example that reproduces the error: github.com/AlexandreChi/spring-batch-lab/tree/main/issues/…. The only difference with your code sample is the annotation SpringBootApplication instead of Configuration.
So I conclude this is something related to the auto-configuration by boot.
I think I am getting close, associating EnableAutoConfiguration and implementation 'com.h2database:h2:1.4.198' is generating the issue. It seems it creates an autowired datasource which has a limited number of simultaneous connections
Indeed, in the logs I see:
QUESTION
I read data from a Q and pass to executor channel to process. No the transaction scope with main thread will not work. How can i can create a transaction from executor channel which has multiple direct channels downstream. Here is the config
...ANSWER
Answered 2021-Apr-21 at 18:33The transaction is just tied to a thread boundaries, so you can't start a transaction sending a message to that executor channel and expect it to be expanded to the subscriber of that channel on the other side, which is going to be indeed a different thread.
However if you point is slightly different (not clear from your question), and you really expect a transaction be be started with your chain
when it consumes a message and dispatches it to one or more of those channels in the router, then it is possible via and nested
configuration for the
TransactionHandleMessageAdvice
.
See more info about transactions in docs: https://docs.spring.io/spring-integration/reference/html/transactions.html#transactions
See also this my old answer: Keep transaction within Spring Integration flow
QUESTION
I have a multithreading project where I read a message from a queue and pass it to spring integration to process it. Each messages goes though diff channel end up storing in DB and sending to downstream Qs.
...ANSWER
Answered 2021-Apr-13 at 17:06The threading doesn't matter; the main thread calls the barrier and whichever thread adds the 3rd message to the aggregator will release the group which can then be used to trigger the barrier.
https://docs.spring.io/spring-integration/docs/current/reference/html/message-routing.html#barrier
QUESTION
I have requirement where i need to pass message to multiple channels asyc. To make my flow asyc i am using all executor channel. But for some reason flow is still sequential. i can seen diff thread as i configured in task executor but in sequence. Here is the configuration I am using
...ANSWER
Answered 2021-Apr-12 at 19:13You might need to call the async implementation bean as shown:
QUESTION
What would be the equivalent of the following outbound channel adapter configuration in spring boot? Assuming the messageChannel
, taskExecutor
, and synchronizationFactory
are defined.
ANSWER
Answered 2021-Jan-13 at 15:30Something like this:
QUESTION
I have a spring boot web application and I want to upload details from CSV files through a batch process. Files can be upload from any location and I want to restrict the process 3 jobs at a time. if already in process of 3 files, we have to give that information to UI as, "Throttle limit is being reached. Try after some time". How Could I achieve this? My current flow.xml is with master slave approach
...ANSWER
Answered 2021-Jan-11 at 09:49The throttle-limit="3"
that you've set on the step is for the threads that will run your step. For your use case, you should be looking for a way to configure the TaskExecutor
that is used by the JobLauncher
to limit the number of concurrent jobs.
You can for example configure the JobLauncher
with a ThreadPoolTaskExecutor
on which you set the queueCapacity
to 3. With this configuration, if you submit more than 3 jobs at a time, the 4th submitted job will fail and you can show the error in your UI.
For the monitoring part, you can inspect the executor's queue size as described in Spring framework monitoring ThreadPoolTaskExecutor queue size
QUESTION
I am new to Spring batch and implementing a spring batch job where it has to pull huge data set from DB and write to file. Below is the sample job config which is working as expected for me.
...ANSWER
Answered 2020-Nov-16 at 12:30You can change your worker step multiOperationStep
to be a FlowStep
of a chunk-oriented step followed by a simple tasklet step where you do the compression. In other words, the worker step is actually two steps combined in one FlowStep
.
QUESTION
I have a flow
that starts with a poller
and hands off the message to several async
flows downstream using task-executors
to execute in parallel
for a given dataset. A downstream aggregator
completes the flow and notifies the poller that the flow
is complete.
I would like to track
every execution of the poller by using MDC
so that the logs
can be mapped to a particular execution of the flow
.
I started by adding MDC
to the poller thread (using Advice
), however with this approach there could be a couple of issues:
- How do I stamp the
MDC
on the executor thread when theasync
hand off happens? - Since executor uses a a
thread pool
, do I need to clear theMDC
before thethread
returns to the pool? Will there be any side effects?
Another approach would be to add MDC
to the Message
header and set it manually on the new thread
during the async
handoff. How to do that? For example, if I turn on the debug
logs, the MDC
should be stamped right from the beginning of the new thread
execution and not from the point where my logic starts in the service activator
.
How to set this on the task-executor
thread (and probably also remove before returning to the pool) using XML
configuration? Something like an MdcAwareThreadPoolExecutor
seen here.
Also, I would not want the MDC
logic to be spread across all the async
handoff endpoints, may be there is some generic way to configure it?
Is there a better way to achieve this? Any known solutions?
...ANSWER
Answered 2020-Sep-25 at 15:05I would like to track every execution of the poller by using MDC so that the logs can be mapped to a particular execution of the flow.
It is fully sound as "you would like to track the message journey in your flow". As you noticed there is the way to set some message header. So, why just don't map your logs by this specific header?
You can take a look into Message History pattern how to gather the whole path for the message, so then in logs you can track it back looking into message headers.
If you really still insist on the MDC, then you definitely need to take a look into some MDCDelegatingExecutorDecorator. Some sample you can borrow from Spring Security and its
DelegatingSecurityContextExecutor`: https://docs.spring.io/spring-security/site/docs/5.4.0/reference/html5/#concurrency
QUESTION
I have a flow that uses a pub/sub channel based gateway with 2 subscribers to send message to 2 SQS queues. In between I have chain to do message transformation. An aggregator is used to summarize the report of every gateway invocation. Happy path works fine, but when my transformer throws error I get this message Reply message received but the receiving thread has already received a reply
and the aggregator gets invoked but future.get
in the Runner
never returns. Sample Config and code to test is as follows:
Config
...ANSWER
Answered 2020-Sep-08 at 11:34With some logging and most importantly the understanding of error and reply channels set on Gateway messages from this post, I am able to solve the issue.
What was the issue here?
- The errorChannel was not set on the messages coming into the chain.
- In case when both chains throw exceptions, the error messages coming to the aggregator did not have a reply channel set on them to return the aggregated message to the gateway's reply channel. The final config looks as below:
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