[ https://issues.apache.org/jira/browse/HDFS-17444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17832567#comment-17832567 ]
ASF GitHub Bot commented on HDFS-17444: --------------------------------------- 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: ![image](https://github.com/apache/hadoop/assets/65019264/ddde305c-da71-424b-b151-cf644bc4e293) > 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! -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org