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https://issues.apache.org/jira/browse/ROCKETMQ-184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16250801#comment-16250801
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ASF GitHub Bot commented on ROCKETMQ-184:
-----------------------------------------
Jaskey commented on issue #95: [ROCKETMQ-184]-It takes too long(3-33 seconds)
to switch to read from slave when master crashes
URL: https://github.com/apache/rocketmq/pull/95#issuecomment-344140091
This pr is not updated from the source for long, so I updated just now ,
please review.
I think this is a good improvement for HA.
@zhouxinyu @vongosling @shroman @dongeforever
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> It takes too long(3-33 seconds) to switch to read from slave when master
> crashes
> --------------------------------------------------------------------------------
>
> Key: ROCKETMQ-184
> URL: https://issues.apache.org/jira/browse/ROCKETMQ-184
> Project: Apache RocketMQ
> Issue Type: Improvement
> Components: rocketmq-client, rocketmq-remoting
> Reporter: Jaskey Lam
> Assignee: Xiaorui Wang
> Fix For: 4.2.0
>
>
> When master crashes, no notifier callback is triggered to pull message again.
> Instead, it relies on the scan service to trigger timeout and then re pull.
> But the pulling command has 30 seconds timeout, and after timeout, pulling
> operation will be scheduled after 3 seconds.
> So it takes 3 to 33 seconds to switch to slave, which is too long and can be
> optimized.
> The root cause is the below repull cost too long to be triggered when master
> crashes
> {code}
> @Override
> public void onException(Throwable e) {
> if
> (!pullRequest.getMessageQueue().getTopic().startsWith(MixAll.RETRY_GROUP_TOPIC_PREFIX))
> {
> log.warn("execute the pull request exception", e);
> }
>
> DefaultMQPushConsumerImpl.this.executePullRequestLater(pullRequest,
> PULL_TIME_DELAY_MILLS_WHEN_EXCEPTION);
> }
> {code}
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