happyboy1024 opened a new issue, #5694: URL: https://github.com/apache/seatunnel/issues/5694
### Search before asking - [X] I had searched in the [issues](https://github.com/apache/seatunnel/issues?q=is%3Aissue+label%3A%22bug%22) and found no similar issues. ### What happened I want to stopp a synchronization task by triggering savepoint. But I find that the task always ends after the data synchronization is complete. I traced the logs and found that the checkpoint process triggered by savepoint always failed when trying to obtain the **checkpointLock**. It should be noted that my task is running in **a single-core** and **4G memory** environment. After analyzing this problem, I find that checkpointLock is locked through synchronized, while synchronized is an unfair lock. In single-core environment, thread hunger is more likely due to high CPU load. The checkpoint flow fails to obtain the checkpointLock. ### SeaTunnel Version 2.3.3 ### SeaTunnel Config ```conf env { job.mode=BATCH job.name=DEMO } source { Jdbc { url="jdbc:mysql://xxxx/transfer_source" driver="com.mysql.cj.jdbc.Driver" user="root" password="xxxx" query="select * from order_info" partition_column=id partition_num=20 parallelism=2 } } transform { } sink { Jdbc { url="jdbc:mysql://xxxx/transfer_sink?rewriteBatchedStatements=true" driver="com.mysql.cj.jdbc.Driver" user="root" password="xxxx" database="transfer_sink" table="order_info_sink" batch_size=1000 enable_upsert=true generate_sink_sql=true primary_keys = [id] query = "" } } ``` ### Running Command ```shell ./bin/seatunnel-local.sh -c config/savepoint.config ./bin/seatunnel-local.sh -s {jobid} ``` ### Error Exception ```log no exception ``` ### Zeta or Flink or Spark Version zeta ### Java or Scala Version 1.8 ### Screenshots The major process obtain checkpoint lock in here:  The checkpoint process try to obtain checkpoint lock in here:  When the savepoint trigger, main thread is executing pollNext. The checkpoint thread will be block as long time in mark of picture one, Until the main thread is completed ### Are you willing to submit PR? - [ ] Yes I am willing to submit a PR! ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
