xiaojunxiang created HDFS-17444: ----------------------------------- Summary: Add JournalSyncerStarted jmx metrics, to Indicates whether the JournalSyncer thread has been started. Key: HDFS-17444 URL: https://issues.apache.org/jira/browse/HDFS-17444 Project: Hadoop HDFS Issue Type: Improvement Components: hdfs Affects Versions: 3.3.6, 3.3.4 Reporter: xiaojunxiang Assignee: xiaojunxiang
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 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. Extra info: The JournalSyncer thread is started when a NameNode requests EditLog information. -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-dev-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-dev-h...@hadoop.apache.org