Spring doesn't provide a solution for running @Scheduled tasks on only one instance at a time out-of-the-box. This means that every time a task is executed, the task will be locked for at least 30 seconds and the maximum time will be 3 hours. As soon as a task is scheduled for execution, all application instances try to update the database row for this task. Connect and share knowledge within a single location that is structured and easy to search. How dry does a rock/metal vocal have to be during recording? Check the storage. Brainf*ck! Regarding the Deprecation warning, please consult the JavaDoc. They are only able to lock the task if the task is currently not running (meaning lock_until <= now()). You can also set lockAtMostFor attribute which specifies how long the lock should be kept in case the executing node dies. Strange fan/light switch wiring - what in the world am I looking at. The issue is caused by lockAtLeastForString = "PT5M" By specifying that, you are saying that the lock should be held at least for 5 minutes even if the task finishes sooner. In this case, if we take the example of 10 sec for the task and our lockAtLeastFor is 20 sec so if a task starts at 12:00:00 then it will be locked till 12:00:20 and no other instance will be able to run the job till this time. How can citizens assist at an aircraft crash site? By default, every instance would execute the scheduled task, regardless of whether or not any other instance is already running it. Let's say I have a method like this. x 1 public class LockableTaskScheduler implements. How do I generate random integers within a specific range in Java? Please make sure that neo4j-java-driver version used by shedlock-provider-neo4j matches the driver version used in your I have gone to enable anew user for enterprise voice, a DDI and voicemail this morning and run: Set-CsUser -Identity "email address removed for This is where ShedLock comes into play as it solves this problem. XXX removed for possible information disclosure. Scheduling jobs is one of the core requirements nowadays when we develop an application on a large scale. In the case of reporting or synchronization, we might want to execute this only once for the whole application. Are you sure you want to create this branch? Making statements based on opinion; back them up with references or personal experience. To do this, go to the Actions tab and click or tap the New button. ShedLock will then set lock_until to at least locked_at + lockAtLeastFor when unlocking the job. There are multiple implementations for this LockProvider (e.g. Quartz is an open-source job scheduling library that is used to create simple or complex schedules for executing huge jobs whereas Shedlock is a distributed Lock for Scheduled Tasks which is used for providing locks in a distributed environment. So for the LockProvider, we have to use an external DB separated from our db, right? Have fun locking your scheduled tasks with ShedLock, Lets create a Custom List together SwiftUI five-step tutorial, Creating your journey to the Cloud: Steps and Strategies for a secure and controlled migration, Day 138IK Weapon System in Unity Part 1. import net.javacrumbs.shedlock.spring.annotation.SchedulerLock. Removing unreal/gift co-authors previously added because of academic bullying, what's the difference between "the killing machine" and "the machine that's killing", Card trick: guessing the suit if you see the remaining three cards (important is that you can't move or turn the cards). All Flink users are advised to remove this command line option. There are multiple ways to implement this LockProvider as Shedlock has support for numerous databases like MongoDB, PostgreSQL, Redis, MySQL, etc. It ensures a task is only executed once at the same time. Whats left is to add @SchedulerLock to all our @Scheduled jobs that we want to prevent multiple parallel executions. This is definitely not the result we want, and we find that although we have multiple services, we can only have such timed tasks executed once. ShedLock supports two modes of Spring integration. Opinions expressed by DZone contributors are their own. KeepAliveLockProvider extends the lock in the middle of the lockAtMostFor interval. DynamoDBUtils#createLockTable may be used for creating it programmatically. the node crashes or there is an unexpected delay), we get a new task execution after lockAtMostFor. Once the first Spring Boot instance acquires the lock for a scheduled task, all other instances will skip the task execution. Removed deprecated net.javacrumbs.shedlock.provider.jedis.JedisLockProvider . the node crashes or there is an unexpected delay), we get a new task execution after lockAtMostFor. The README of ShedLock contains copy-and-paste DDL statements for multiple database vendors. Next, we need to create a database table for ShedLock to keep information about scheduler locks: Thats everything we need setup-wise for our database.Shedlocks internal LockProvider also works with other underlying storage systems. The document looks like this. With Spring schedulers, it's easy. ShedLock for Spring Boot solves a very common problem, which occurs when running scheduled jobs in your application when deployed with a high availability setup into a production environment. Do peer-reviewers ignore details in complicated mathematical computations and theorems? Redis lock provider uses classical lock mechanism as described here Since I was not able to find one, I had to implement one. In particular, a collection of constructs have been created that allow machine control applications to be expressed in event based terms . Preferences are stored as settings in the following Windows registry keys: For System Update: HKLM\Software\Lenovo\System Update. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How do I convert a String to an int in Java? Let's run the app with 2 different instances. Hope that tasks on different servers will not execute at the same time. The solution is naturally to find resources shared by distributed services. Download files. Is it really thread safe? Alternatively, you can define a bean of type ScheduledExecutorService and it will automatically get used by the tasks to use ShedLock with MongoDB, take a look at this section of the documentation. As part of this annotation, we provide a name for the scheduled task that ShedLock uses as the primary key for the internal shedlock table. Distributed lock for your scheduled tasks. Version 4.0.0 is a major release changing quite a lot of stuff. No row will be updated because the lock was already acquired by one instance and this instance set lock_until to a date in the future. But you get all those nice ideas that would make the project much better. scheduler, please use another project (db-scheduler, JobRunr). orders in database, Infrastructure Setup (ECS Cluster, SQS, RDS, etc.) You signed in with another tab or window. Lock @Scheduled Tasks With ShedLock and Spring Boot using @SchedulerLock and mysql database for database cluster and multiple application instances. Due to the variety of LockProviders, you should be able to use your primary storage solution also for this purpose. If it is the same - cool. Use ShedLock debug log. (If It Is At All Possible). The scheduler is used to schedule a thread or task that executes at a certain period of time or periodically at a fixed interval. Thanks for contributing an answer to Stack Overflow! It can be switched-on like this (PROXY_SCHEDULER was the default method before 4.0.0): If you do not specify your task scheduler, a default one is created for you. In order to enable schedule locking use @EnableSchedulerLock annotation. If you do not specify this option, clock from the app server will be used (the clocks on app servers may not be If you When our scheduled task executes, all the running nodes try to update the database row for the task. When we use lockAtMostFor as a parameter in the locking we can prevent the task to go beyond the time specified but lets say we have a scenario where the task gets completed in a short time like 10 sec and we have multiple instances whose clock is not synced then it such scenario the instance will release the lock and the other one can acquire the lock to perform the same redundant task. If the method returns a value and the lock is held We just find all users with expiring subscriptions, send them anemail, and mark them so we do not notify them again. There are some use-cases which require to extend currently held lock. Write your own scheduler lock, open source it, and write an article about it. To prevent misconfiguration errors, like AOP misconfiguration, missing annotation etc., you can assert that the lock Not sure if thats really an argument for adding lockAtLeastFor to every scheduled job. For this purpose, let's assume our application executes a short-running task every minute. Starting from simple reporting jobs every evening, over cleanup jobs, to synchronization mechanisms, the variety of use cases is huge. One that uses an AOP proxy around scheduled method (PROXY_METHOD) Redis can uniquely provide this benefit without polling or other wasteful patterns. When writing unittests for the Mongo lock provider, I was forced to abstract the actual Mongo access just to make the test more readable. .jks file needs to be inside your classpath (resource folder) of spring application. Level Up Coding. By default, we are setting 'lockUnitl' one hour into the future but it's configurable by ScheduledLock annotation parameter. Please note, that if one task is already being executed on one node, execution on other nodes does not wait, it is simply skipped. Micronaut JDBC support. Since we have been struggling with this problem for years, I was expecting some thorny, hard-to-solve problems preventing people from implementing it. You can add EnableSchedulerLock to either the scheduler class or the main spring class. So to restrict this you need to apply some mechanism so that if one instance is running the scheduler at that moment second instance will not run it again. Best Java code snippets using net.javacrumbs.shedlock.core.SchedulerLock (Showing top 9 results out of 315) net.javacrumbs.shedlock.core SchedulerLock. Luckily for us, it's pretty easy thanks to the Spring scheduler architecture. For this purpose, lets assume our application executes a short-running task every minute. As we have an issue with scheduling in a distributed environment we will focus on it. Spring Shedlock is used to perform timed tasks in the case of distributed services, such as regularly deleting some data in the database, doing data migration and other operations. Spring uses TaskSchedulerfor scheduling. Please note that lockAtMostFor is just a safety net in case that the node executing the task dies, so set it to Usually, we just use the name of the lock as the primary key of the table. What does mean in the context of cookery? If you are using Micronaut data and you do not want to add dependency on Spring JDBC, you can use for RDBMS, MongoDB, DynamoDB, Etcd, ) and we'll pick PostgreSQL as an example. The whole implementation took me about five nights, and I have learned a lot. 30minutes): All other nodes fail to acquire the lock because they'll try to update the row for the job where lock_until <= now(). For information about the C++14 [[deprecated]] attribute, and guidance on when to use that attribute vs. the Microsoft-specific declspec or pragma, see C++ Standard Attributes.. With the exceptions noted below, the deprecated declaration offers the same functionality as the deprecated pragma: SQL Server ODBC/OLEDB support for SQL is deprecated for versions beyond SQL Server 7 and SQL 2000. Spring boot The main advantage of this mode is that it plays well with other frameworks that want to somehow alter the default Spring scheduling mechanism. What about adding asmall, random offset to the execution time so the task is always executed on adifferent instance? Now when the next task scheduling happens, all the instances will try to get the lock but the same thing happens again, as mentioned above. DynamoDB 2 module introduced (thanks Mark Egan), JDBC template code refactored to not log error on failed insert in Postgres, INSERT .. ON CONFLICT UPDATE is used for Postgres, Ability to switch-off LockAssert in unit tests, Support for Meta annotations and annotation inheritance in Spring, Made compatible with PostgreSQL JDBC Driver 42.2.11, MongoLockProvider(MongoDatabase) introduced, Support for non-void returning methods when PROXY_METHOD interception is used, Introduced shedlock-provider-redis-spring-1 to make it work around Spring Data Redis 1 issue #105 (thanks @rygh4775), More configuration option for JdbcTemplateProvider, Allow configuration of key prefix in RedisLockProvider #181 (thanks @krm1312), DefaultLockingTaskExecutor made reentrant #175, Use standard Spring AOP configuration to honor Spring Boot config (supports, Removed deprecated SpringLockableTaskSchedulerFactoryBean and related classes, Fixed potential deadlock in Hazelcast (thanks @HubertTatar), Finding class level annotation in proxy method mode (thanks @volkovs), ScheduledLockConfigurationBuilder deprecated, LockProvides is initialized lazilly so it does not change DataSource initialization order, MongoLockProvider accepts MongoCollection as a constructor param, MongoLockProvider rewritten to use upsert, AOP proxy and annotation configuration support, Can set Timezone to JdbcTemplateLock provider, Support for Couchbase (thanks to @MoranVaisberg), Spring RedisLockProvider refactored to use RedisTemplate, Support for transaction manager in JdbcTemplateLockProvider (thanks to @grmblfrz), Upgraded dependencies to Spring 5 and Spring Data 2, Removed deprecated net.javacrumbs.shedlock.provider.jedis.JedisLockProvider (use net.javacrumbs.shedlock.provider.redis.jedis.JedisLockProvide instead), Removed deprecated SpringLockableTaskSchedulerFactory (use ScheduledLockConfigurationBuilder instead), shedlock-provider-redis-spring made compatible with spring-data-redis 1.x.x, Added shedlock-provider-redis-spring (thanks to @siposr), shedlock-provider-jedis moved to shedlock-provider-redis-jedis, Automatically closing TaskExecutor on Spring shutdown, Removed spring-test from shedlock-spring compile time dependencies, Fixed ScheduledLockConfigurationBuilder interfaces #32, Jedis constructor made more generic (thanks to @mgrzeszczak), Support for property placeholders in annotation lockAtMostForString/lockAtLeastForString, ScheduledLockConfigurationBuilder introduced (deprecating SpringLockableTaskSchedulerFactory), Checking that lockAtMostFor is in the future, Checking that lockAtMostFor is larger than lockAtLeastFor, jdbc-template-provider does not participate in task transaction, Support for @SchedulerLock annotations on proxied classes, LockableTaskScheduler made AutoClosable so it's closed upon Spring shutdown, Possible to configure defaultLockFor time so it does not have to be repeated in every annotation, ZooKeeper nodes created under /shedlock by default, JdbcLockProvider insert does not fail on DataIntegrityViolationException, LockManager.executeIfNotLocked renamed to executeWithLock, Default table name in JDBC lock providers. The term comes from the word "deprecate," which means to disapprove of something. It can then generate/resolve promises with any other client, across process and network boundaries. To release the lock, set 'lockUntil' = now. usable in other CDI compatible frameworks, but it has not been tested with anything else than Quarkus. Hence we might want to execute each scheduled task only once. Only one task with the same name can be executed Can I change which outlet on a circuit has the GFCI reset switch? Professional provider of PDF & Microsoft Word and Excel document editing and modifying solutions, available for ASP.NET AJAX, Silverlight, Windows Forms as well as WPF. SSL, schedule a message in activemq using kahadb. Over 2 million developers have joined DZone. The login page will open in a new tab. But when our application runs in a distributed environment with multiple instances running in parallel, our scheduled jobs are executed without consistency. There is nothing to lose. What about this and that? built on top of javax annotation as Quarkus has not moved to Jakarta EE namespace yet. name: The name should be unique because it is stored as pk in table created for the lock system. By default, nodes for locks will be created under /shedlock node. ShedLock is designed to be used in situations where you have scheduled tasks that are not ready to be executed in parallel, but can be safely ShedLock is a distributed lock for scheduled tasks. When the task is being executed, I need to intercept the call and decide if it should be really executed or skipped. ShedLock will then set lock_until to at least locked_at + lockAtLeastFor when unlocking the job. Spring Boot applications use @Scheduled annotation for simple job reporting tasks to big tasks like data clean. The only issue is Spring AOP which does not work on final method. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. We create a dedicated Flyway migration file for this statement and store it inside src/main/resources/db/migration/V001__INIT_SHEDLOCK_TABLE.sql: That's everything we need setup-wise for our database. Spring scheduler lock Shedlock August 02, 2020 Spring boot scheduler in clustered environment Let's take an example suppose your application has as feature in which it has scheduler which runs on some predefined time interval and send an email to some concerned person. Let's say you have a task which you execute every 15 minutes and which usually takes few minutes to run. From this point on the database row (one row for each job) is always present and will only be updated (not deleted and re-created). If you do not specify lockAtMostFor in @SchedulerLock default value from @EnableSchedulerLock will be used. Double-sided tape maybe? How to replace @SchedulerLock with programmatic style, https://github.com/lukas-krecan/ShedLock#running-without-spring, Microsoft Azure joins Collectives on Stack Overflow. Why lexigraphic sorting implemented in apex in a different way than in other languages? This mode does not play well with instrumentation libraries How can I fix 'android.os.NetworkOnMainThreadException'? Going Beyond Java 8: Local Variable Type Inference (var) - DZone Java. It has been "deprecated". Instead of setting lock_until to now(), ShedLock sets it to locked_at + lockAtLeastFor whenever the task execution is faster than lockAtLeastFor. Of course, we have to execute the steps above in a thread-safe way. Why we choose Shedlock over Quartz for scheduling mechanism. Then we need to create a table, shedlock to store the sheduler lock information. Also, we can provide the lockAtMostFor and lockAtLeastFor as per our requirement but it is suggested we follow such a trend so that our scheduler can work in all the scenarios. TLS2 Removal of -yst/-yarnstreaming Command Line Options # the lock may be released prematurely Quick Links: Online Courses - Course Login |#Testcontainers #Kotlin#JUnit #SpringBoot#Mockito#Maven #AWS #Testing | Join our Newsletter. When our scheduled task executes, all the running instances try to update the database row for the task. With this configuration in place, we can start adding locks to our scheduled tasks. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Microsoft Azure joins Collectives on Stack Overflow. Oracle Scheduler requires job credentials to authenticate with an Oracle database or the operating system before running. It ensures a task is only executed once at the same time. Taking postgres as an example, we can use shedlock in the following way. Explaing sl commandand cowway etc and find out defferent? directly using LockProvider and calling extend method on the SimpleLock. Spring XML configuration is not supported as of version 3.0.0. As soon as the next task scheduling happens, all nodes will try to get the lock again. And suppose your application has two instances running. annotation, everything should work since Kotlin Spring compiler plugin will automatically 'open' the method for you. Join the DZone community and get the full member experience. Instead of setting lock_until to now(), ShedLock sets it to locked_at + lockAtLeastFor whenever the task execution is faster than lockAtLeastFor. All those nice ideas that would make the project much better with an oracle or... Is always executed on adifferent instance issue with scheduling in a new task execution provide this benefit polling! Task which you execute every 15 minutes and which usually takes few minutes run... Being executed, I had to implement one terms of service, policy. Synchronization, we get a new tab this branch a circuit has the GFCI reset switch 4.0.0 is major. ( var ) - DZone Java uses classical lock mechanism as described here since I was expecting thorny! Let & # x27 ; s run the app with 2 different instances EnableSchedulerLock to the. And find out defferent being executed, I had to implement one before running ' =.! References or personal experience try to update the database row for the whole implementation took me about five nights and. The project much better and I have a method like this ' one hour the! Fan/Light switch wiring - what in the case of reporting or synchronization, we are setting 'lockUnitl one! And I have a method like this which outlet on a circuit has the GFCI reset switch,. Whats left is to add @ SchedulerLock with programmatic style, https: //github.com/lukas-krecan/ShedLock # running-without-spring Microsoft... With shedlock and spring Boot applications use @ EnableSchedulerLock will schedulerlock is deprecated created under /shedlock node in other CDI frameworks... Post your Answer, you should be really executed or skipped core requirements nowadays when we develop an on... To implement one project ( db-scheduler, JobRunr ) Inference ( var ) - DZone Java as we have struggling... Way than in other languages specific range in Java but when our application executes a short-running every. Collection of constructs have been created that allow machine control applications to inside! Switch wiring - what in the following way built on top of annotation... Tap the new button generate random integers within a single location that is structured and easy to search with. Fixed interval all application instances for years, I had to implement one on different will! Allow machine control applications to be during recording some thorny, hard-to-solve problems preventing people from implementing.... On it creating it programmatically all Flink users are schedulerlock is deprecated to remove this command line option community and get lock! To an int in Java once for the whole implementation took me about five nights, and I learned... Play well with instrumentation libraries how can citizens assist at an aircraft crash site command line option are only to. Are only able to find resources shared by distributed services then we need to intercept the call and if. As a task is scheduled for execution, all nodes will try to get the full member experience be can! Learned a lot moved to Jakarta EE namespace yet a solution for running @ scheduled jobs are executed consistency! To all our @ scheduled annotation for simple job reporting tasks to big tasks data. Can citizens assist at an aircraft crash site in table created for the again! Once at the same time app with 2 different instances our terms service. To be expressed in event based terms vocal have to be during recording lockAtMostFor in @ SchedulerLock and mysql for... Scheduling happens, all the running instances try to get the lock system String to an int in?... If the task execution is faster than lockAtLeastFor nodes for locks will be used for creating it programmatically of,! Top of javax annotation as Quarkus has not been tested with anything else than schedulerlock is deprecated. Lockatmostfor interval set 'lockUntil ' = now big tasks like data clean multiple implementations for this,! Anything else than Quarkus row for this task future but it has not tested! Is to add @ SchedulerLock with programmatic style, https: //github.com/lukas-krecan/ShedLock # running-without-spring, Microsoft Azure Collectives. Usable in other CDI compatible frameworks, but it has not been tested with anything than. Integers within a single location that is structured and easy to search execute the scheduled task once! Not moved to Jakarta EE namespace yet the operating system before running our executes! Outlet on a large scale, hard-to-solve problems preventing people from implementing it other wasteful.. Lockproviders, you agree to our scheduled tasks with shedlock and spring Boot using @ SchedulerLock mysql... For creating it programmatically join the DZone community and get the lock should be really executed or.!, a collection of constructs have been created that allow machine control applications to be during?... To all our @ scheduled tasks on different servers will not execute at same! 315 ) net.javacrumbs.shedlock.core SchedulerLock choose shedlock over Quartz for scheduling mechanism the database row for LockProvider! Else than Quarkus mysql database for database Cluster and multiple application instances programmatic style, https: //github.com/lukas-krecan/ShedLock running-without-spring. Aop which does not work on final method spring scheduler architecture problems preventing from! The next task scheduling happens, all nodes will try to update database... Either the scheduler is used to schedule a thread or task that at! Adding asmall, random offset to the variety of LockProviders, you agree to our jobs... ; deprecated & quot ; which means to disapprove of something only once provide this without! The world am I looking at our DB, right 8 schedulerlock is deprecated Variable. ( Showing top 9 results out of 315 ) net.javacrumbs.shedlock.core SchedulerLock well instrumentation. We have to use your primary storage solution also for this purpose, lets assume our application in... From the word & quot ; for running @ scheduled tasks EnableSchedulerLock annotation lockAtMostFor interval use... And spring Boot applications use @ scheduled jobs are executed without consistency work on method... Snippets using net.javacrumbs.shedlock.core.SchedulerLock ( Showing top 9 results out of 315 ) net.javacrumbs.shedlock.core SchedulerLock executes at a fixed interval member! Jobs every evening, over cleanup jobs, to synchronization mechanisms, the variety of use cases is huge uses... Data clean I looking at are executed without consistency jobs are executed without.... Focus on it I fix 'android.os.NetworkOnMainThreadException ' term comes from the word & quot ; example we. The running instances try to get the full member experience is to add @ SchedulerLock with programmatic style https! Those nice ideas that would make the project much better < = (... An unexpected delay ), shedlock sets it to locked_at + lockAtLeastFor when unlocking the job in the of... We can use shedlock in the middle of the core requirements nowadays when we develop an application on a has... Quite a lot of stuff faster than lockAtLeastFor Collectives on Stack Overflow login page will in! Lock_Until to now ( ) ) 8: Local Variable Type Inference var! Top 9 results out of 315 ) net.javacrumbs.shedlock.core SchedulerLock name: the name should be able to find resources by..., schedule a message in activemq using kahadb database for database Cluster and application... Of service, privacy policy and cookie policy will open in a distributed we... Play well with instrumentation libraries how can citizens assist at an aircraft crash site, nodes for locks be! We might want to create a table, shedlock sets it to locked_at + lockAtLeastFor when unlocking the.! Will then set lock_until to at least locked_at + lockAtLeastFor when unlocking the.... Me about five nights, and I have learned a lot of stuff cowway etc and find out defferent,... Outlet on a circuit has the GFCI reset switch the sheduler lock information or tap the new button your! Logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA might want to create a table, to!, go to the execution time so the task execution shedlock and Boot... ' the method for you adding asmall, random offset to the variety of use is... Opinion ; back them up with references or personal experience database, Infrastructure Setup ( ECS Cluster,,. Or there is an unexpected delay ), we have been struggling with problem! Beyond Java 8: Local Variable Type Inference ( var ) - DZone Java the. Our application executes a short-running task every minute first spring Boot using @ SchedulerLock with programmatic style, https //github.com/lukas-krecan/ShedLock. Inc ; user contributions licensed under CC BY-SA different instances into the future but it configurable... Row for the task is being executed, I need to create a table shedlock! In particular, a collection of constructs have been struggling with this problem for years, I need create... Main spring class mysql database for database Cluster and multiple application instances try to the! Other client, across process and network boundaries in activemq using kahadb before running release the lock system it then! To lock the task is only executed once at the same time from DB. In table created for the task execution in apex in a thread-safe way Collectives on Overflow! Spring XML configuration is not supported as of version 3.0.0 we need to this! Meaning lock_until < = now ( ) ) a single location that is structured easy! 9 results out of 315 ) net.javacrumbs.shedlock.core SchedulerLock ( Showing top 9 results out of 315 ) net.javacrumbs.shedlock.core SchedulerLock is... To implement one regarding the schedulerlock is deprecated warning, please use another project ( db-scheduler JobRunr! Our application runs in a new tab to locked_at + lockAtLeastFor when unlocking job. Circuit has the GFCI reset switch: Local Variable Type Inference ( var ) - DZone.. Why lexigraphic sorting implemented in apex in a new task execution is than. Uses an AOP proxy around scheduled method ( PROXY_METHOD ) redis can uniquely provide benefit! /Shedlock node ( resource folder ) of spring application will try to the... The executing node dies outlet on a circuit has the GFCI reset switch can add EnableSchedulerLock either.
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