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From Jonathan Ellis <>
Subject Re: OoM querying very wide-row in CLI
Date Wed, 28 Mar 2012 01:45:42 GMT
I believe we added support for specifying a column range to the cli
recently.  I don't know if there is a default limit.

On Tue, Mar 27, 2012 at 8:40 PM, Brian O'Neill <> wrote:
> Today, running 1.0.7, we saw a node crash with an OutOfMemory.
> We have a single row with ~10million columns in it. (using it as an index)
> Accidentally, we attempted to list the CF in CLI that had the wide-row.
>  This caused the CLI to hang and then eventually crashed Cassandra with an
> OoM.
> I know this is a case of "If it hurts when you do that, don't do that", but
> we may want to better protect against it in the CLI and/or the DB.  I know
> we limit row counts on lists in CLI.  Do we also limit column counts?  If
> not, I don't mind submitting a patch for this.
> let me know,
> brian
> --
> Brian ONeill
> Lead Architect, Health Market Science (
> mobile:215.588.6024
> blog:
> blog:

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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