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https://issues.apache.org/jira/browse/HBASE-11860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14115379#comment-14115379
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stack commented on HBASE-11860:
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First off, what Sean says "...our upgrade docs expressly call out not
supporting this kind of upgrades...." That said, it seems going 0.94 to 1.0
wouldn't take much work. If it is just a case of leaving around some
deprecated APIs and restoring old scripts removed in zeal, I'd be game for
testing and making sure it basically works.
> Restore UpgradeTo in order to upgrade a HBase cluster to the latest release
> ---------------------------------------------------------------------------
>
> Key: HBASE-11860
> URL: https://issues.apache.org/jira/browse/HBASE-11860
> Project: HBase
> Issue Type: Improvement
> Components: HFile, master
> Reporter: Esteban Gutierrez
> Assignee: Esteban Gutierrez
> Fix For: 0.99.0, 2.0.0
>
>
> Users should have the option to upgrade to a newer release of HBase without
> performing a transitive upgrade to HBase 0.96 (EOL'd) or HBase 0.98 and then
> HBase 1.x or 2.x
> In HBASE-11611 UpgradeTo96 was removed and it won't be possible to migrate a
> HBase 0.94 cluster to HBase 1.x or 2.x without the extra step.
> Initially we can restore part of the functionality of the tool supporting
> migration to namespaces and report for the existence of any HFileV1 file and
> ZKDataMigrator could be safely removed.
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