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From Denis Magda <dma...@apache.org>
Subject Re: Improvements for P2P class loading
Date Tue, 24 Sep 2019 22:32:12 GMT

Why do we broadcast the request to all the nodes in case of scenario a)?
There should be a reason for that.

Alex Goncharuk, do you remember we planned to revisit the P2P as part of
Ignite 3.0 to remove certain limitations? How about linking all the P2P
tasks together and create either an IEP or an umbrella ticket.


On Tue, Sep 24, 2019 at 12:55 AM Denis Garus <garus.d.g@gmail.com> wrote:

> Igniters!
> I would like to propose a few improvements for the P2P class loading
> feature in Ignite.
> These improvements have the aim to reduce the number of requests that may
> be needing to get a class on a remote node.
> a. We should send a request for a class to the node initiator firstly.
> Currently, GridDeploymentClassLoader sends a request for a class to all
> participated nodes one by one until it gets a successful response. However,
> in most cases, the required byte code would be loaded from the node that
> initiates execution. To find out what is the node initiator, we can use the
> way that we use to determine a security context to execute a user-defined
> code (see GridIoManager#invokeListener). If the node initiator doesn't have
> a required class, we should ask other participated nodes as it is
> currently.
> b. Some classes in a single response.
> When a required class contains anonymous and/or inner classes, Ignite tries
> to get these classes using separate requests. However, we can determine
> that case and send data, that we send anyway, in a single response as an
> answer for the first request. In this way, we may significantly reduce the
> number of communications required for a class loading.
> What do you think?
> I would like to create a separate task for a. and b.

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