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From Valentin Kulichenko <valentin.kuliche...@gmail.com>
Subject Re: Making Ignite shmem library optional
Date Thu, 27 Oct 2016 19:05:12 GMT
Absolutely agree. This functionality is unreliable right now and at the
very least it should be switched off by default as soon as possible. Going
forward, it should be either fixed or removed, because it's just a broken
piece of code.

-Val

On Thu, Oct 27, 2016 at 11:53 AM, Denis Magda <dmagda@gridgain.com> wrote:

> Igniters,
>
> Presently, if someone starts up a cluster and has at least two nodes
> running on a single Unix machine then those nodes will be communicating
> over the shared memory (shmem) by default.
>
> This approach sounds absolutely reasonable for me but the shmem library is
> not ideal at the moment. I observed many situations when a cluster got
> stuck in the production or during long running tests due to some unclear
> issues in shmem internals. Even from Ignite community side we have the
> following shmem related issues
> https://issues.apache.org/jira/browse/IGNITE-1578 <
> https://issues.apache.org/jira/browse/IGNITE-1578>
> https://issues.apache.org/jira/browse/IGNITE-1294 <
> https://issues.apache.org/jira/browse/IGNITE-1294>
>
> My proposal would be to make this library optional starting from the
> nearest Apache Ignite release. As far as I recall, it’s still mandatory
> because it's supposed that it speeds up our Spark and Hadoop integrations.
> But I would avoid using something that can accelerate a solution and fail
> at some unpredictable time.
>
> Any thoughts or controversial arguments?
>
> —
> Denis
>
>

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