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https://issues.apache.org/jira/browse/ROCKETMQ-242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16106845#comment-16106845
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ASF GitHub Bot commented on ROCKETMQ-242:
-----------------------------------------
Github user qqeasonchen commented on the issue:
https://github.com/apache/incubator-rocketmq/pull/139
@lizhanhui pls help to review
> mqclient can not fetch nameSrvAddr periodly
> -------------------------------------------
>
> Key: ROCKETMQ-242
> URL: https://issues.apache.org/jira/browse/ROCKETMQ-242
> Project: Apache RocketMQ
> Issue Type: Bug
> Components: rocketmq-client
> Affects Versions: 4.0.0-incubating, 4.1.0-incubating
> Environment: test and production
> Reporter: Eason Chen
> Assignee: Xiaorui Wang
> Fix For: 4.2.0-incubating
>
>
> when mqclientinstance start, it getNameSrvAddr once by bellow code:
> if (null == this.clientConfig.getNamesrvAddr()) {
>
> this.clientConfig.setNamesrvAddr(this.mQClientAPIImpl.fetchNameServerAddr());
> }
> but in startScheduledTask()，it will not start the schedule task if
> namesrvAddr is not null
> ================code=====================
> {code:java}
> public void start() throws MQClientException {
> synchronized (this) {
> switch (this.serviceState) {
> case CREATE_JUST:
> this.serviceState = ServiceState.START_FAILED;
> // If not specified,looking address from name server
> *{color:red} if (null ==
> this.clientConfig.getNamesrvAddr()) {
>
> this.clientConfig.setNamesrvAddr(this.mQClientAPIImpl.fetchNameServerAddr());
> }{color}*
> // Start request-response channel
> this.mQClientAPIImpl.start();
> // Start various schedule tasks
> this.startScheduledTask();
> // Start pull service
> this.pullMessageService.start();
> // Start rebalance service
> this.rebalanceService.start();
> // Start push service
>
> this.defaultMQProducer.getDefaultMQProducerImpl().start(false);
> log.info("the client factory [{}] start OK",
> this.clientId);
> this.serviceState = ServiceState.RUNNING;
> break;
> case RUNNING:
> break;
> case SHUTDOWN_ALREADY:
> break;
> case START_FAILED:
> throw new MQClientException("The Factory object[" +
> this.getClientId() + "] has been created before, and failed.", null);
> default:
> break;
> }
> }
> }
> private void startScheduledTask() {
> *{color:red} if (null == this.clientConfig.getNamesrvAddr()) {{color}*
> this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
> @Override
> public void run() {
> try {
>
> MQClientInstance.this.mQClientAPIImpl.fetchNameServerAddr();
> } catch (Exception e) {
> log.error("ScheduledTask fetchNameServerAddr
> exception", e);
> }
> }
> }, 1000 * 10, 1000 * 60 * 2, TimeUnit.MILLISECONDS);
> }
> {code}
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