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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-10628) get JEMAlloc debug output out of nodetool output
Date Tue, 03 Nov 2015 08:07:27 GMT


Sylvain Lebresne commented on CASSANDRA-10628:

As I mentioned in CASSANDRA-10581, I'm not terribly fan of the warning as it exists in the
first place. I'd have a strong preference for warning for this in the {{system.log}} file,
like we do for many other things. I can see at least 2 ways to make that happen: 1) export
some custom variable in the startup shell script if JEMalloc is detected and check for that
variable on the java side or 2) pass a startup option that says if we detected JEMalloc, with
a preference for 1). Doing so will obviously also solve this ticket.

> get JEMAlloc debug output out of nodetool output
> ------------------------------------------------
>                 Key: CASSANDRA-10628
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jim Witschey
>            Assignee: Robert Stupp
>             Fix For: 2.2.4, 3.0.0
> This is a followup ticket for CASSANDRA-10581. The consensus on the Cassandra TE is that
the debug output for loading JEMAlloc is helpful (or at least harmless when starting C*, but
not when starting {{nodetool}}, which, it turns out, sources {{cassandra-env}}:
> You can reproduce the excessive output with
> {code}
> ccm create test-nodetool-output -v git:cassandra-3.0 -n 1 ; ccm start --wait-for-binary-proto
; ccm node1 nodetool ring
> {code}
> The simplest solution would probably be to redirect the output of the sourcing to {{/dev/null/}}.
I don't know if that's the right thing to do; it may be better to move the {{LD_PRELOAD}}-setting
logic to {{bin/cassandra}}. I'm not sure what the reasoning would be for putting something
in one place or another, so I leave it to the dev team to decide on the best solution.
> Assigning [~snazy] for now; feel free to reassign

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