Sahil Takiar created IMPALA-10141:
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Summary: Include aggregate TCP metrics in per-node profiles
Key: IMPALA-10141
URL: https://issues.apache.org/jira/browse/IMPALA-10141
Project: IMPALA
Issue Type: Improvement
Reporter: Sahil Takiar
The /rpcz endpoint in the debug web ui includes a ton of useful TCP-level
metrics per kRPC connection for all inbound / outbound connections. It would be
useful to aggregate some of these metrics and put them in the per-node
profiles. Since it is not possible to currently split these metrics out per
query, they should be added at the per-host level. Furthermore, only metrics
that can be sanely aggregated across all connections should be included. For
example, tracking the number of Retransmitted TCP Packets across all
connections for the duration of the query would be useful. TCP retransmissions
should be rare and are typically indicate of network hardware issues or network
congestions, having at least some high level idea of the number of TCP
retransmissions that occur during a query can drastically help determine if the
network is to blame for query slowness.
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