k walton created FLINK-36781:
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Summary: Flink SQL REPL Remote Gateway lag
Key: FLINK-36781
URL: https://issues.apache.org/jira/browse/FLINK-36781
Project: Flink
Issue Type: Bug
Components: Table SQL / Client, Table SQL / Gateway
Affects Versions: 1.20.0
Environment: This was noticed when spawning a gateway on a remote
kubernetes cluster and connecting through a port forward, which exacerbated the
lag. But I've captured screenshots of the network requests on each key press on
wireshark locally, which I've attached a recording of for clarity.
You can reproduce this by doing the following:
# Have docker installed
# in one terminal run a host gateway
{code:java}
docker run -p 8083:8083 --rm -it --entrypoint /bin/bash flink:1.20 -c
"/opt/flink/bin/start-cluster.sh && /opt/flink/bin/sql-gateway.sh
start-foreground -D sql-gateway.endpoint.rest.port=8083 -D
sql-gateway.endpoint.rest.address=localhost" {code}
# in a second terminal run a sql client connected to it, on my machine the
command is
{code:java}
/opt/homebrew/opt/apache-flink/libexec/bin/sql-client.sh gateway -e
localhost:8083 {code}
# Observe network requests on every key press
Reporter: k walton
Attachments: flink-sql-gateway-lag.mov
When connecting to a remote gateway with the Flink SQL REPL we have noticed
that a network request is made for every key press. This makes the REPL
terminal unusably lagging when typing text into it.
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