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https://issues.apache.org/jira/browse/CASSANDRA-21117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18094081#comment-18094081
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Stefan Miklosovic commented on CASSANDRA-21117:
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1) I do not see why it is important for an operator to see what the total pool
size was (the amount of memory allocated). Why would we care? In the report,
there is a figure of 30GiB. Why do you think it is important of an operator to
see what was the cumulative amount of memory allocated? "size" being 30G is
really misleading here. If you prefer to have it there still we would need to
introduce yet another entry into that output.
2) That is quite hard to answer, honestly, I would just leave it out from this.
> Nodetool info reports unreliable size in use
> --------------------------------------------
>
> Key: CASSANDRA-21117
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21117
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Tool/nodetool
> Reporter: Brad Schoening
> Assignee: Stefan Miklosovic
> Priority: Low
> Fix For: 4.1.x, 5.0.x, 6.x, 7.x
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> We noticed 'nodetool info' may report the networking cache may be 2X the heap
> size or larger.
> {noformat}
> Node: 169.102.228.220
> Heap Memory (MB) : 9581.65 / 16384.00
> Off Heap Memory (MB) : 398.83
> Data Center : NA_NE_C01
> Rack : D
> Exceptions : 0
> Key Cache : entries 964712, size 100 MiB, capacity 100 MiB, 70259124 hits,
> 240261115 requests, 0.292 recent hit rate, 14400 save period in seconds
> Row Cache : entries 0, size 0 bytes, capacity 0 bytes, 0 hits, 0 requests,
> NaN recent hit rate, 0 save period in seconds
> Counter Cache : entries 0, size 0 bytes, capacity 50 MiB, 0 hits, 0 requests,
> NaN recent hit rate, 7200 save period in seconds
> Chunk Cache : entries 964502, size 6.1 GiB, capacity 9.97 GiB, 1515943127
> misses, 2414866720 requests, 0.372 recent hit rate, 96.680 microseconds miss
> latency
> Network Cache : size 30.9 GiB, overflow size: 30.15 GiB, capacity 768
> MiB{noformat}
> in other cases, it grew to a reported 75GB or even negative values
>
> {noformat}
> Network Cache : size 76.05 GiB, overflow size: 75.05 GiB, capacity 1 GiB
> Network Cache : size -154303849440 bytes, overflow size: -155377591264 bytes,
> capacity 1 GiB
> {noformat}
>
> The Cassandra version this is happening on all recent patch versions – so
> i.e. 5.0.4 - 4.1.9
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