Add Prometheus metrics to MemoryManager #518
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gruuya
approved these changes
Apr 23, 2024
Cargo.toml
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| tokio-graceful-shutdown = { version = "0.14" } | ||
| tonic = { version = "0.10.0", optional = true } | ||
| tower = { version = "0.4", optional = true } | ||
| tower = { version = "0.4" } |
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| impl Metrics { | ||
| pub fn new() -> Self { | ||
| describe_gauge!( |
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I'm late to the party, but should this be describe_counter rather than describe_gauge? Ditto in L24
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Oh, that's actually a good catch - these are used as counters below and not gauges, though for some reason they still show up in the metrics output as type counter.
$ curl localhost:9191/metrics | grep memo | grep TYPE
# TYPE seafowl_datafusion_memory_pool_allocated_bytes_total counter
# TYPE seafowl_datafusion_memory_pool_freed_bytes_total counter
# TYPE seafowl_datafusion_memory_pool_reserved_bytes_current gauge
Cowboy-pushed 2755bb8 to fix.
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Make the metrics feature non-optional (there's a lot of code coming that exposes metrics and it'll get painful/pointless to maintain the ability to opt out of compiling metrics support at the cargo feature level
Add a special
MemoryPoolthat wraps the default DataFusionMemoryPool(that setting defaults toGreedyMemoryPool, so construct that explicitly) and logs the total allocated/released bytes by each DataFusion query tree node.Also replace all uses of
RwLock<HashMap>toDashMapas @gruuya proposed.Sample output: