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Hudson commented on HDFS-9655: ------------------------------ FAILURE: Integrated in Hadoop-trunk-Commit #9142 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/9142/]) HDFS-9655. NN should start JVM pause monitor before loading fsimage. (lei: rev 2ec438e8f7cd77cb48fd1264781e60a48e331908) * hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java * hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/JvmPauseMonitor.java * hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt > 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)