Client is sending OPTIONS command to all shards in a node - while it should be sufficient to get it from a single shard

[mykaul]

trafficstars

The response (SUPPORTED) will be the same from all shards - it's useless to send it to all shards and just an overhead to both sides. (note: seen in a packet capture - unsure what driver was used, I suspect the GoCQL driver)

[mmatczuk]

Note that options frame is often used as L7 ping due to the lack of better alternatives.

[mykaul]

Note that options frame is often used as L7 ping due to the lack of better alternatives.

Good to know! TCP keepalive (while not L7) seems sufficient to me though.

[mykaul]

Could it be that it needs it for SCYLLA_SHARD_AWARE_PORT information?

[mykaul]

https://github.com/scylladb/gocql/issues/162 is not fixing it, but making it less noisy.