xiaojunxiang created HDFS-17444:
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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.
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