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https://issues.apache.org/jira/browse/CASSANDRA-21556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ling Mao updated CASSANDRA-21556:
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Fix Version/s: 7.x
> Add metrics about Netty memeory usage
> -------------------------------------
>
> Key: CASSANDRA-21556
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21556
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Observability/Metrics
> Reporter: Ling Mao
> Assignee: Ling Mao
> Priority: Normal
> Fix For: 7.x
>
>
> When Netty Direct Memory leaks occur, they can be extremely difficult to
> diagnose and may cause serious production issues. Add metrics to monitor
> Netty memory usage for observability, debugging, and alerting.
> The comments in `NettyMemoryMetrics` provide a summary of what contributes to
> Netty Direct Memory and Java Direct Memory usage.
> Do not use `Netty allocator.metric()` for these metrics. The memory usage
> from individual allocators is relatively small and distributed across
> different components. Additionally, querying allocator metrics is not as
> lightweight as using `PlatformDependent::usedDirectMemory`.
> The metrics location:
>
> {code:java}
> org.apache.cassandra.metrics:type=NettyMemory,name=UsedDirectMemory
> org.apache.cassandra.metrics:type=NettyMemory,name=DirectMemoryLimit
> # promethus metrics
> # HELP cassandra_nettymemory_directmemorylimit Attribute exposed for
> management
> org.apache.cassandra.metrics:name=DirectMemoryLimit,type=NettyMemory,attribute=Value
> # TYPE cassandra_nettymemory_directmemorylimit gauge
> cassandra_nettymemory_directmemorylimit 4.294967296E9
> # HELP cassandra_nettymemory_useddirectmemory Attribute exposed for
> management
> org.apache.cassandra.metrics:name=UsedDirectMemory,type=NettyMemory,attribute=Value
> # TYPE cassandra_nettymemory_useddirectmemory gauge
> cassandra_nettymemory_useddirectmemory 1.6777216E7
> {code}
>
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