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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2879) Compatibility validation between YARN 2.2/2.4 and 2.6
Date Wed, 19 Nov 2014 19:33:34 GMT
Zhijie Shen created YARN-2879:
---------------------------------

             Summary: 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 2.2 || MR 2.2 + Shuffle 2.6 || MR 2.4 + Shuffle
2.4 || MR 2.4 + Shuffle 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 shuffle handler version.

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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