[
https://issues.apache.org/jira/browse/CASSANDRA-18454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Brad Schoening updated CASSANDRA-18454:
---------------------------------------
Description:
Nodetool gcstats provides only a brief one line output of historical GC
activity with Max, Total, Stdev, etc
{noformat}
% nodetool gcstats
Interval (ms) Max GC Elapsed (ms)Total GC Elapsed (ms)Stdev GC Elapsed
(ms) GC Reclaimed (MB) Collections Direct Memory Bytes
11979 0 0
NaN 0 0 -1
{noformat}
Performance of garbage collection is such an key part of Cassandra performance
that it would be helpful to have more complete metrics with *gcstats* here.
The MBean java.lang.GarbageCollector has recent statistic which could be added
in events/second for:
* GcThreadCount
* Duration
The current size of eden / survivor / old space and humongous allocations
should be shown as well.
The metrics show with jhsdb jmap would be very helpful as well, if they're
available.
[https://docs.oracle.com/en/java/javase/11/troubleshoot/diagnostic-tools.html#GUID-A69901EC-F87D-4B63-A8B7-DE8684AD4FF9]
was:
Nodetool gcstats reports historical GC activity with Max, Total, Stdev, etc
{noformat}
% nodetool gcstats
Interval (ms) Max GC Elapsed (ms)Total GC Elapsed (ms)Stdev GC Elapsed
(ms) GC Reclaimed (MB) Collections Direct Memory Bytes
11979 0 0
NaN 0 0 -1
{noformat}
* Interval (ms)
* Max GC Elapsed (ms)
* Total GC Elapsed (ms)
* Stdev GC Elapsed (ms)
* GC Reclaimed (MB)
* Collections
* Direct Memory Bytes
but in the MBean java.lang.GarbageCollector there are recent statistic in
events/second for:
* GcThreadCount
* Duration
It would be useful to see size of eden / survivor / old space and humongous
allocations.
The metrics show with jhsdb jmap would be very helpful as well, if they're
available.
[https://docs.oracle.com/en/java/javase/11/troubleshoot/diagnostic-tools.html#GUID-A69901EC-F87D-4B63-A8B7-DE8684AD4FF9]
> Enhance nodetool gcstats
> -------------------------
>
> Key: CASSANDRA-18454
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18454
> Project: Cassandra
> Issue Type: Improvement
> Components: Tool/nodetool
> Reporter: Brad Schoening
> Priority: Normal
>
> Nodetool gcstats provides only a brief one line output of historical GC
> activity with Max, Total, Stdev, etc
> {noformat}
> % nodetool gcstats
> Interval (ms) Max GC Elapsed (ms)Total GC Elapsed (ms)Stdev GC Elapsed
> (ms) GC Reclaimed (MB) Collections Direct Memory Bytes
> 11979 0 0
> NaN 0 0 -1
> {noformat}
> Performance of garbage collection is such an key part of Cassandra
> performance that it would be helpful to have more complete metrics with
> *gcstats* here. The MBean java.lang.GarbageCollector has recent statistic
> which could be added in events/second for:
> * GcThreadCount
> * Duration
> The current size of eden / survivor / old space and humongous allocations
> should be shown as well.
> The metrics show with jhsdb jmap would be very helpful as well, if they're
> available.
> [https://docs.oracle.com/en/java/javase/11/troubleshoot/diagnostic-tools.html#GUID-A69901EC-F87D-4B63-A8B7-DE8684AD4FF9]
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