gortiz commented on code in PR #16939:
URL: https://github.com/apache/pinot/pull/16939#discussion_r2401172295
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pinot-broker/src/main/java/org/apache/pinot/broker/grpc/BrokerGrpcServer.java:
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@@ -168,6 +169,15 @@ private void registerBufferMetrics(PooledByteBufAllocator
bufAllocator, BrokerMe
brokerMetrics.setOrUpdateGlobalGauge(BrokerGauge.GRPC_NETTY_POOLED_CACHE_SIZE_NORMAL,
metric::normalCacheSize);
brokerMetrics.setOrUpdateGlobalGauge(BrokerGauge.GRPC_NETTY_POOLED_THREADLOCALCACHE,
metric::numThreadLocalCaches);
brokerMetrics.setOrUpdateGlobalGauge(BrokerGauge.GRPC_NETTY_POOLED_CHUNK_SIZE,
metric::chunkSize);
+ // Notice here we are using
io.grpc.netty.shaded.io.netty.util.internal.PlatformDependent instead of
+ // io.netty.util.internal.PlatformDependent because gRPC shades Netty to
avoid version conflicts.
+ // This also means it uses a different pool of direct memory and a
different setting of max direct memory.
+ //
+ // Also notice these two metrics are also set by GrpcQueryService. Both
are set to the same value, so it
+ // doesn't matter which one _wins_ in the metrics system.
Review Comment:
we could, but this way they are only set if the specific service is started.
Remember that customers can disable different protocols.
and also it doesn't hurt, given they metrics api is prepared for this
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