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https://issues.apache.org/jira/browse/HADOOP-4605?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Cutting updated HADOOP-4605:
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Component/s: test
> This might work once we're serious about back-compatibility (1.0?).
I think it's a pre-requisite to becoming serious about back-compatibility: we
cannot claim that a release is back-compatible until we've tested that code
from prior compatible versions still runs against it.
Note that this permits us to aggressively update tests as APIs evolve: the
trunk tests of public APIs should only test the trunk versions of the APIs and
should use no deprecated APIs. Then when we test against an older version of
the tests, we'd test against just that version, enforcing the rule that folks
should make sure their code compiles without deprecation warnings against
version X before upgrading to version X+1.
> should run old version of unit tests to check back-compatibility
> ----------------------------------------------------------------
>
> Key: HADOOP-4605
> URL: https://issues.apache.org/jira/browse/HADOOP-4605
> Project: Hadoop Core
> Issue Type: Improvement
> Components: test
> Reporter: Doug Cutting
>
> We should test back-compatibility by running unit tests from a prior release.
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