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https://issues.apache.org/jira/browse/HDFS-3644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon reopened HDFS-3644:
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I disagree. There are people running systems with LV -19 which has the
conflicted opcodes. Currently if you run OEV on these logs, you end up getting
errors because it reads delegation token ops as eg symlink ops. If we don't
support OEVing a given LV, we should raise an error.
> OEV should recognize and deal with 0.20.20x opcode versions
> -----------------------------------------------------------
>
> Key: HDFS-3644
> URL: https://issues.apache.org/jira/browse/HDFS-3644
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: tools
> Affects Versions: 2.0.0-alpha, 3.0.0
> Reporter: Todd Lipcon
> Priority: Minor
>
> We have some opcode conflicts for edit logs between 0.20.20x (LV -19, -31) vs
> newer versions. For edit log loading, we dealt with this by forcing users to
> save namespace on an earlier version before upgrading. But, using a trunk OEV
> on an older version is useful since the OEV has had so many improvements. It
> would be nice to be able to specify a flag to the OEV to be able to run on
> older edit logs.
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