[HBASE-2388] Give a very explicit message when we figure a big GC pause

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.20.3
• Fix Version/s: 0.90.0
• Hadoop Flags: Reviewed
• Assignee: Jean-Daniel Cryans
• Reporter: Jean-Daniel Cryans
• Created: 29/Mar/10 17:08
• Updated: 20/Nov/15 12:40
• Resolved: 30/Mar/10 17:07

Description

Our new users get confused when they see their region servers disappearing. If they are proactive enough, they even show us with some messages like:

2010-03-28 20:24:27,439 WARN org.apache.hadoop.hbase.util.Sleeper: We slept
79410ms, ten times longer than scheduled: 5000
2010-03-28 20:24:27,439 WARN org.apache.hadoop.hbase.util.Sleeper: We slept
78781ms, ten times longer than scheduled: 3000

For us it's very obvious what just happened, for our users not at all. I think we could easily just create a very comprehensive entry about this issue in the troubleshooting page and put a link directly into the error message.