Hari Sekhon created AMBARI-24244:
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Summary: Ambari
Key: AMBARI-24244
URL: https://issues.apache.org/jira/browse/AMBARI-24244
Project: Ambari
Issue Type: Bug
Components: ambari-metrics, metrics
Affects Versions: 2.5.2
Reporter: Hari Sekhon
Ambari in-built Grafana HBase GC Time graph in HBase - RegionServers dashboard
is very wrong and doesn't reflect the times I've grepped across hbase
regionserver logs for util.JvmPauseMonitor.
I've inherited a very heavily loaded HBase + OpenTSDB cluster where there are
RegionServer losses occurring due to GCs around 30 seconds(!) causing ZK +
HMaster to declare them dead. The Grafana graphs show peaks around 70ms due to
avg downsampling. Editing the graph and changing Aggregator from 'avg' to
'none' and Transform from 'rate' to 'diff' seems to brings the graph closer to
what the actual logs and behaviour are showing. But this might need more
fiddling and investigation.
Right now the GC Times graphs which is incredibly important is worse than
useless, it's misleading as it shows there are no GC issues when there are
actually very large very severe GC issues on this cluster.
This is a vanilla Ambari deployed Grafana with Ambari Metrics.
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