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From "Liu, Raymond" <>
Subject RE: issue regarding akka, protobuf and Hadoop version
Date Tue, 05 Nov 2013 01:53:15 GMT
I plan to do the work on scala-2.10 branch, which already move to akka 2.2.3, hope that to
move to akka 2.3-M1 (which support protobuf 2.5.x) will not cause many problem and make it
a test to see is there further issues, then wait for the formal release of akka 2.3.x

While the issue is that I can see many commits on master branch is not merged into scala-2.10
branch yet. The latest merge seems to happen on OCT.11, while as I mentioned in the dev branch
merge/sync thread, seems that many earlier commit is not included and which will surely bring
extra works on future code merging/rebase. So again, what's the code sync strategy and what's
the plan of merge back into master? 

Best Regards,
Raymond Liu

-----Original Message-----
From: Reynold Xin [] 
Sent: Tuesday, November 05, 2013 8:34 AM
Subject: Re: issue regarding akka, protobuf and Hadoop version

I chatted with Matt Massie about this, and here are some options:

1. Use dependency injection in google-guice to make Akka use one version of protobuf, and
YARN use the other version.

2. Look into OSGi to accomplish the same goal.

3. Rewrite the messaging part of Spark to use a simple, custom RPC library instead of Akka.
We are really only using a very simple subset of Akka features, and we can probably implement
a simple RPC library tailored for Spark quickly. We should only do this as the last resort.

4. Talk to Akka guys and hope they can make a maintenance release of Akka that supports protobuf

None of these are ideal, but we'd have to pick one. It would be great if you have other suggestions.

On Sun, Nov 3, 2013 at 11:46 PM, Liu, Raymond <> wrote:

> Hi
>         I am working on porting spark onto Hadoop 2.2.0, With some 
> renaming and call into new YARN API works done. I can run up the spark 
> master. While I encounter the issue that Executor Actor could not 
> connecting to Driver actor.
>         After some investigation, I found the root cause is that the 
> akka-remote do not support protobuf 2.5.0 before 2.3. And hadoop move 
> to protobuf 2.5.0 from 2.1-beta.
>         The issue is that if I exclude the akka dependency from hadoop 
> and force protobuf dependency to 2.4.1, the compile/packing will fail 
> since hadoop common jar require a new interface from protobuf 2.5.0.
>          So any suggestion on this?
> Best Regards,
> Raymond Liu
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