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https://issues.apache.org/jira/browse/ROCKETMQ-167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15976166#comment-15976166
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yukon commented on ROCKETMQ-167:
--------------------------------
Thanks, there is a concurrent issue indeed, but scanNotActiveBroker will
recover even encounter a exception.
> namesrv RouteInfoManager scanNotActiveBroker have the Thread competition
> -------------------------------------------------------------------------
>
> Key: ROCKETMQ-167
> URL: https://issues.apache.org/jira/browse/ROCKETMQ-167
> Project: Apache RocketMQ
> Issue Type: Bug
> Components: rocketmq-namesrv
> Affects Versions: 4.0.0-incubating
> Reporter: zhaoziyan
> Assignee: Xiaorui Wang
>
> {code}
> public void scanNotActiveBroker() {
> Iterator<Entry<String, BrokerLiveInfo>> it =
> this.brokerLiveTable.entrySet().iterator();
> while (it.hasNext()) {
> Entry<String, BrokerLiveInfo> next = it.next();
> long last = next.getValue().getLastUpdateTimestamp();
> if ((last + BROKER_CHANNEL_EXPIRED_TIME) <
> System.currentTimeMillis()) {
> RemotingUtil.closeChannel(next.getValue().getChannel());
> it.remove();
> log.warn("The broker channel expired, {} {}ms",
> next.getKey(), BROKER_CHANNEL_EXPIRED_TIME);
> this.onChannelDestroy(next.getKey(),
> next.getValue().getChannel());
> }
> }
> }
> {code}
> scanNotActiveBroker dont have the writelock ,but it is modify the
> brokerLiveTable and Iterator the brokerLiveTable .
> NSScheduledThread and nettyeventExcutor Thread have the competition.
> The scanNotActiveBroker may throw
> java.util.ConcurrentModificationException: null
> and nevel run again
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