[jira] [Assigned] (ROCKETMQ-107) Access ServiceState is not thread safe when start() or shutdown()

["Jaskey Lam (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ROCKETMQ-107?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jaskey Lam reassigned ROCKETMQ-107:
-----------------------------------

    Assignee: Jaskey Lam  (was: Xiaorui Wang)

> Access ServiceState is not thread safe when start() or shutdown()
> -----------------------------------------------------------------
>
>                 Key: ROCKETMQ-107
>                 URL: https://issues.apache.org/jira/browse/ROCKETMQ-107
>             Project: Apache RocketMQ
>          Issue Type: Bug
>          Components: rocketmq-client
>            Reporter: Jaskey Lam
>            Assignee: Jaskey Lam
>            Priority: Minor
>
> When start() or shutdown(), service's state is not thread safe which may break happen-before.
> For example: 
>         switch (this.serviceState) {
>             case CREATE_JUST:
>                 log.info("the consumer [{}] start beginning. messageModel={}, isUnitMode={}", this.defaultMQPushConsumer.getConsumerGroup(),
>                     this.defaultMQPushConsumer.getMessageModel(), this.defaultMQPushConsumer.isUnitMode());
>                 this.serviceState = ServiceState.START_FAILED;
>                 ..// do some start job here
>                 this.serviceState = ServiceState.RUNNING;
>                 break;
>             case RUNNING:
>             case START_FAILED:
>             case SHUTDOWN_ALREADY:
>                 throw new MQClientException("The PushConsumer service state not OK, maybe started once, "//
>                     + this.serviceState//
>                     + FAQUrl.suggestTodo(FAQUrl.CLIENT_SERVICE_NOT_OK),
>                     null);
>             default:
>                 break;
>         }
> 1. If the user is start twice in two thread, the resources may initize twice.
> 2. if the user start in threadA and shutdown very quicky in another thread B, shutdown may not reclaim the resources.
> Though the sceniro is very uncommon, but it is indeed a bug here. Fix is actually quite trivial.



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