[KUDU-1238] Servers should periodically log when hitting memory limits

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Public beta
• Fix Version/s: 0.6.0
• Component/s: tserver
• Target Version/s: 0.6.0
• Code Review: http://gerrit.cloudera.org:8080/1363
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 29/Oct/15 03:14
• Updated: 09/Nov/15 06:22
• Resolved: 09/Nov/15 06:22

Description

When a server's memory usage has gone above its soft memory limit, it starts to reject certain types of requests. However, it does so silently. When it's above the hard limit, it rejects all requests, also silently. This makes a server basically useless, but currently nothing is reported in the logs. We should add some throttled (eg once a second) logging - INFO when above the soft limit, and WARNING when above the hard limit.