Todd Lipcon created HADOOP-9618:
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Summary: Add thread which detects JVM pauses
Key: HADOOP-9618
URL: https://issues.apache.org/jira/browse/HADOOP-9618
Project: Hadoop Common
Issue Type: New Feature
Components: util
Affects Versions: 3.0.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Often times users struggle to understand what happened when a long JVM pause
(GC or otherwise) causes things to malfunction inside a Hadoop daemon. For
example, a long GC pause while logging an edit to the QJM may cause the edit to
timeout, or a long GC pause may make other IPCs to the NameNode timeout. We
should add a simple thread which loops on 1-second sleeps, and if the sleep
ever takes significantly longer than 1 second, log a WARN. This will make GC
pauses obvious in logs.
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