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https://issues.apache.org/jira/browse/CASSANDRA-21117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18051947#comment-18051947
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Stefan Miklosovic commented on CASSANDRA-21117:
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I think what should happen is that we should use {{usedSizeInBytes}} method
instead of {{sizeInBytes}} in {{BufferPool}} when reporting on {{Size}} for
that specific value displayed in {{nodetool info}}.
> 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
> Reporter: Brad Schoening
> Priority: Low
>
> 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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