[ https://issues.apache.org/jira/browse/HDFS-9655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
John Zhuge updated HDFS-9655: ----------------------------- Status: Patch Available (was: Open) > NN should start JVM pause monitor before loading fsimage > -------------------------------------------------------- > > Key: HDFS-9655 > URL: https://issues.apache.org/jira/browse/HDFS-9655 > Project: Hadoop HDFS > Issue Type: Bug > Reporter: John Zhuge > Assignee: John Zhuge > Priority: Critical > Attachments: HDFS-9655.001.patch > > > We have seen many cases of NameNode startup either extremely slow or even > hung. Most of them were caused by insufficient heap size with regard to the > metadata size. Those cases were resolved by increasing the heap size. > However it did take support team some time to root cause. JVM pause warning > messages would greatly assist in such diagnosis, but NN starts JVM pause > monitor after fsimage/edits loading. > Propose to start JVM pause monitor before loading fsimage/edits. -- This message was sent by Atlassian JIRA (v6.3.4#6332)