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From Andrew <>
Subject Re: too many open files
Date Sat, 09 Aug 2014 17:58:41 GMT
I just had a generator that (in the incorrect way) had a cluster as a member variable, and
would call .connect() repeatedly.  I _thought_, incorrectly, that the Session was thread
unsafe, and so I should request a separate Session each time—obviously wrong in hind sight.

There was no special logic; I had a restriction of about 128 connections per host, but the
connections were in the 100s of thousands, like the OP mentioned.  Again, I’ll see about
reproducing it on Monday, but just wanted the repro steps (overall) to live somewhere in case
I can’t. :)


On August 8, 2014 at 4:08:50 PM, Tyler Hobbs ( wrote:

On Fri, Aug 8, 2014 at 5:52 PM, Redmumba <> wrote:
Just to chime in, I also ran into this issue when I was migrating to the Datastax client.
Instead of reusing the session, I was opening a new session each time. For some reason, even
though I was still closing the session on the client side, I was getting the same error.

Which driver?  If you can still reproduce this, would you mind opening a ticket? (

Tyler Hobbs

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