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[collector] fix dispatch concurrency bug #956

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merged 2 commits into from
May 15, 2023

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yujianzhong520
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What's changed?

org.dromara.hertzbeat.collector.dispatch.CommonDispatcher 244行
metricsSet.forEach(metricItem -> {});

org.dromara.hertzbeat.common.entity.job.Jon 211 行
if (!metricsSet.remove(metrics)) {
会出现并发错误。

迭代时出现异常,导致监控轮训任务终止。
java.util.ConcurrentModificationException: null at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1510) at java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1533) at java.base/java.lang.Iterable.forEach(Iterable.java:74) at com.usthe.collector.dispatch.CommonDispatcher.dispatchCollectData(CommonDispatcher.java:244)
在Job的getNextCollectMetrics返回一个新的HashSet,避免出现这个问题。

该问题在监控Mysql服务的时候能稳定重现出现。

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org.dromara.hertzbeat.common.entity.job.Jon 211 行
改为
org.dromara.hertzbeat.common.entity.job.Job 211 行

@tomsun28 tomsun28 added enhancement New feature or request good first pull request Good for newcomers bugfix labels May 15, 2023
…ob.java

Signed-off-by: tomsun28 <tomsun28@outlook.com>
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👍 LGTM.

@tomsun28 tomsun28 changed the title concurrency bug [collector] fix dispatch concurrency bug May 15, 2023
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@all-contributors please add @yujianzhong520 for code

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@tomsun28

I've put up a pull request to add @yujianzhong520! 🎉

@tomsun28 tomsun28 merged commit ea717ab into apache:master May 15, 2023
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2 participants