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https://issues.apache.org/jira/browse/YARN-2879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhijie Shen resolved YARN-2879.
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Resolution: Not A Problem
Close this validation jira. There's still one MR compatibility issue which is
already filed. We can deal with it separately.
> Compatibility validation between YARN 2.2/2.4 and 2.6
> -----------------------------------------------------
>
> Key: YARN-2879
> URL: https://issues.apache.org/jira/browse/YARN-2879
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Zhijie Shen
> Assignee: Zhijie Shen
>
> Recently, I did some simple backward compatibility experiments. Bascially,
> I've taken the following 2 steps:
> 1. Deploy the application (MR and DistributedShell) that is compiled against
> *old* YARN API (2.2/2.4) on *new* YARN cluster (2.6). The application is
> submitted via *new* Hadoop (2.6) client.
> 2. Deploy the application (MR and DistributedShell) that is compiled against
> *old* YARN API (2.2/2.4) on *new* YARN cluster (2.6). The application is
> submitted via *old* Hadoop (2.2/2.4) client that comes with the app.
> I've tried these 2 steps on both insecure and secure cluster. Here's a short
> summary:
> || || || DS 2.2 || DS 2.4 || MR 2.2 + Shuffle and RT 2.2 || MR 2.2 + Shuffle
> and RT 2.6 || MR 2.4 + Shuffle and RT 2.4 || MR 2.4 + Shuffle and RT 2.6 ||
> | Insecure | New Client | OK | OK | Client Incompatible | Client Incompatible
> | OK | OK |
> | Insecure | Old Client | OK | OK | AM Incompatible | Client Incompatible |
> OK | OK |
> | Secure | New Client | OK | OK | Client Incompatible | Client Incompatible |
> OK | OK |
> | Secure | Old Client | OK | OK | AM Incompatible | Client Incompatible | OK
> | OK |
> Note that I've tried to run NM with both old and new version of shuffle
> handler plus the runtime libs.
> In general, the compatibility looks good overall. There're a few issues that
> are related to MR, but they seem to be not the YARN issue. I'll post the
> individual problem in the follow-up comments.
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