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Very slow performance when opening a new session
Roy Reznik <reznik.roy@...>
I'm seeing very slow performance when opening a new session in JanusGraph.
The message I'm sending is this:
Basically, the inner query doesn't really matter. When I use the session processor with a new session id that's never been used it takes ~1.2s for JanusGraph to respond.
Queries afterwards, with the same session id are much quicker.
Why is the overhead of starting a new session so large? Can it be reduced somehow by configuration?
I can confirm your observation using the standard 'bin/janusgraph.sh start' from the full janusgraph distribution.
I just used the the gremlin console with:
:remote connect tinkerpop.server conf/remote.yaml session
a = 3
Although there is no logical reason for it in hindsight, I checked whether the delay was not due to class loading in gremlin console, using:
I can also confirm that the delay does not happen with a non-sessioned connection.
I can also confirm that the delay occurs for the gremlin server and gremlin console of the Apache TinkerPop distribution (version 3.4.8).
I guess the initial delay is due to the additional overhead of sessions as described in:
Best wishes, Marc
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