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https://issues.apache.org/jira/browse/CASSANDRA-19022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17938863#comment-17938863
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Stefan Miklosovic commented on CASSANDRA-19022:
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Based on this discussion thread and replies there (1), I am not sure that these
figures make a lot of sense to add. We might indeed add them but it seems to me
that their significance is inflated.
(1)
https://the-asf.slack.com/archives/CK23JSY2K/p1743069090617519?thread_ts=1743065084.687319&cid=CK23JSY2K
> Nodetool gcstats correctly displays Direct Memory usage and supports printing
> in table format
> ---------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-19022
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19022
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Tool/nodetool
> Reporter: Brad Schoening
> Assignee: Ling Mao
> Priority: Normal
> Fix For: 5.x
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> If {{io.netty.maxDirectMemory}} is not specified, Netty defaults the limit to
> the max heap size. Thus, direct memory in use can be significant.
> However, trying this on two different platform and the result returned in
> gcstats is always -1:
> {noformat}
> Interval (ms) Max GC Elapsed (ms)Total GC Elapsed (ms)Stdev GC Elapsed (ms)
> GC Reclaimed (MB) Collections Direct Memory Bytes
> 2792770717 274 665186 54
> 41276288089024 6120 -1{noformat}
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