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From S Ahmed <sahmed1...@gmail.com>
Subject Re: cassandra instability
Date Thu, 22 Apr 2010 16:03:39 GMT
If digg uses PHP with cassandra, can the library really be that old?

Or they are using their own custom php cassandra client? (probably, but just
making sure).

On Fri, Apr 16, 2010 at 2:13 PM, Jonathan Ellis <jbellis@gmail.com> wrote:

> On Fri, Apr 16, 2010 at 12:50 PM, Lee Parker <lee@socialagency.com> wrote:
> > Each time I start it up, it will
> > work fine for about 1 hour and then it will crash the servers.  The error
> > message on the servers is usually an out of memory error.
>
> Sounds like
> http://wiki.apache.org/cassandra/FAQ#slows_down_after_lotso_inserts
> to me.
>
> > I will get
> > several time out errors on the clients
>
> Symtomatic of running out of memory.
>
> > and occasionally get an error telling
> > me that i was missing the timestamp.
>
> This is an entirely different problem.  Your client is sending
> garbage, plain and simple.  Why that is, I don't know.  The PHP Thrift
> binding is virtually unmaintained, so it could be a bug there, but
> Digg uses PHP against Cassandra extensively and hasn't hit this to my
> knowledge.  As I said in another thread, I wouldn't rule out bad
> hardware.
>
> > The timestamp error is accompanied by
> > a server crashing if I use framed transport instead of buffered.
>
> Thrift is fragile when the client sends it garbage.
> (https://issues.apache.org/jira/browse/THRIFT-601)
>
> > One of the reasons we
> > were trying cassandra was to scale out with smaller nodes rather than
> having
> > to run larger instances for mysql.
>
> 2 x 1GB isn't a whole lot to do a bulk load with.  You may have to
> throttle your clients to fix the OOM completely.
>
> -Jonathan
>

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