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https://issues.apache.org/jira/browse/HDFS-17444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17832567#comment-17832567
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ASF GitHub Bot commented on HDFS-17444:
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xiaojunxiang2023 opened a new pull request, #6694:
URL: https://github.com/apache/hadoop/pull/6694
The JornalNode JVM process is not immediately in a normal state until the
JournalSyncer thread is started.
For some management platforms such as Ambari rolling restart JournalNode, we
need a jmx metric to determine whether the JournalSyncer thread is started and
enter working state for current namespace before restarting the next
JournalNode. Otherwise, restart too quickly and more than half of JournalNodes
will be out of order, causing the NameNode to die.
When i add it , the effect is as follows:
> Add getJournalSyncerStatus jmx metrics, to Indicates whether the
> JournalSyncer thread for the every namespace has enter working state.
> --------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-17444
> URL: https://issues.apache.org/jira/browse/HDFS-17444
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.3.4, 3.3.6
> Reporter: xiaojunxiang
> Assignee: xiaojunxiang
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2024-03-31-09-31-18-056.png
>
>
> The JornalNode JVM process is not immediately in a normal state until the
> JournalSyncer thread is started.
> For some management platforms such as Ambari rolling restart JournalNode, we
> need a jmx metric to determine whether the JournalSyncer thread is started
> and enter working state for current namespace before restarting the next
> JournalNode. Otherwise, restart too quickly and more than half of
> JournalNodes will be out of order, causing the NameNode to die.
> When i add it , the effect is as follows:
> !image-2024-03-31-09-31-18-056.png!
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