You are viewing a plain text version of this content. The canonical link for it is here.
Posted to user@ignite.apache.org by ght230 <gh...@163.com> on 2016/05/17 14:25:52 UTC
Can compute grid guarantee the correctness of the result
As I know, Ignite compute grid can provide distributed computations ability
in parallel fashion, but I am not sure whether it can guarantee the
correctness of the computations result.
In other words, if there is some error during computitions,computing grid
will discard the result or will do re-computation?
--
View this message in context: http://apache-ignite-users.70518.x6.nabble.com/Can-compute-grid-guarantee-the-correctness-of-the-result-tp4992.html
Sent from the Apache Ignite Users mailing list archive at Nabble.com.
Re: Can compute grid guarantee the correctness of the result
Posted by ght230 <gh...@163.com>.
Thank you for your advise.
--
View this message in context: http://apache-ignite-users.70518.x6.nabble.com/Can-compute-grid-guarantee-the-correctness-of-the-result-tp4992p5010.html
Sent from the Apache Ignite Users mailing list archive at Nabble.com.
Re: Can compute grid guarantee the correctness of the result
Posted by Dmitriy Setrakyan <ds...@apache.org>.
Compute grid jobs will execute more than once if the server crashed in the
middle of execution. In that case, the job will be failed over and started
from scratch.
If you want exactly once guarantee, then assign IDs to your computations or
events and store them in a cache. This way, if the event ID is already
there, then the job has already executed. You can do such cache updates
within a transaction in order to make sure that everything happens
atomically.
Does this make sense?
D.
On Tue, May 17, 2016 at 6:19 PM, ght230 <gh...@163.com> wrote:
> According to the reference document, ignite compute grid can provide at
> least
> once guarantee.
>
> I want to know in what conditions will compute grid execute the jobs more
> than once and will it lead to incorrect results.
>
>
>
> --
> View this message in context:
> http://apache-ignite-users.70518.x6.nabble.com/Can-compute-grid-guarantee-the-correctness-of-the-result-tp4992p5006.html
> Sent from the Apache Ignite Users mailing list archive at Nabble.com.
>
Re: Can compute grid guarantee the correctness of the result
Posted by ght230 <gh...@163.com>.
According to the reference document, ignite compute grid can provide at least
once guarantee.
I want to know in what conditions will compute grid execute the jobs more
than once and will it lead to incorrect results.
--
View this message in context: http://apache-ignite-users.70518.x6.nabble.com/Can-compute-grid-guarantee-the-correctness-of-the-result-tp4992p5006.html
Sent from the Apache Ignite Users mailing list archive at Nabble.com.
Re: Can compute grid guarantee the correctness of the result
Posted by vkulichenko <va...@gmail.com>.
Hi,
Yes, jobs are failed over to other nodes if some error happens. If this is
not possible for any reason, the client will get an exception. See [1] for
details.
[1] https://apacheignite.readme.io/docs/fault-tolerance
-Val
--
View this message in context: http://apache-ignite-users.70518.x6.nabble.com/Can-compute-grid-guarantee-the-correctness-of-the-result-tp4992p5000.html
Sent from the Apache Ignite Users mailing list archive at Nabble.com.