John Zhuge created HDFS-9655:
--------------------------------
Summary: 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
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)
