[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [External]Re: I/O threads busy error

Hi Vishal,
This might be an indication that you are sending several requests in
parallel without waiting for a response and you need to introduce
throttling in your application, as Dinesh mentioned.

This issue is related to the usage of the DataStax C++ driver, you should
consider starting a new mail thread on the driver mailing list:!forum/cpp-driver-user


El mar., 20 nov. 2018 a las 13:42, <Vishal1.Sharma@xxxxxxx> escribió:

> This issue is mainly being observed when the table whose data is being
> fetched contains a column which stores a very large text(12.5 KB). Could
> this be a possible reason? How can I solve the issue? Which settings do I
> have to change?
> -----Original Message-----
> From: dinesh.joshi@xxxxxxxxx.INVALID [mailto:
> dinesh.joshi@xxxxxxxxx.INVALID]
> Sent: Tuesday, November 20, 2018 3:15 PM
> To: dev@xxxxxxxxxxxxxxxxxxxx
> Subject: [External]Re: I/O threads busy error
> You're probably hitting this -
> From my reading it feels you may want to throttle your queries or play
> around with the driver settings. Essentially it seems the number of queries
> you're issuing is greater than what the cluster can handle and therefore
> they're queuing up in the driver.
> Dinesh
>     On Monday, November 19, 2018, 10:24:10 PM PST, Vishal1.Sharma@xxxxxxx
> <Vishal1.Sharma@xxxxxxx> wrote:
>  Dear all,
> I've got a 2 node Cassandra cluster(3.11.2). I'm using Datastax's c++
> driver(ver 2.7) in my application to fetch/add data from the cluster(RHEL
> 6.9). Sometimes I'm getting the error "All connections on all I/O threads
> are busy" in my application.  I'm unable to figure out why I am getting
> this error infrequently and not everytime.
> Has anyone faced such errors before? Please let me know any possible
> reasons behind the issue.
> Thanks and regards,
> Vishal Sharma
> P.S. I don't really know whether this is a Datastax driver's issue or
> Cassandra's issue that's why I'm posting this query here.
> "Confidentiality Warning: This message and any attachments are intended
> only for the use of the intended recipient(s).
> are confidential and may be privileged. If you are not the intended
> recipient. you are hereby notified that any
> review. re-transmission. conversion to hard copy. copying. circulation or
> other use of this message and any attachments is
> strictly prohibited. If you are not the intended recipient. please notify
> the sender immediately by return email.
> and delete this message and any attachments from your system.
> Virus Warning: Although the company has taken reasonable precautions to
> ensure no viruses are present in this email.
> The company cannot accept responsibility for any loss or damage arising
> from the use of this email or attachment."