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https://issues.apache.org/jira/browse/HBASE-4389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13133306#comment-13133306
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stack commented on HBASE-4389:
------------------------------
Patch in hbase-4388 addresses some of above.
+ It increments HRI VERSION (and makes HRI able to deserialize the old format
that has HTD)
+ We no longer have a migrated flag but a version in root for meta table (a
short)
+ Migration should be idempotent now; we look at each row and check its HRI
VERSION and if not current, do update
+ Duplicated code has been removed
+ We no longer do createTableDescriptor on each HRI scanned; just on the first.
Outstanding:
+ Migration code has been coalesced some but still code spread about
+ There is no sanity checking that all HTDs for a table are equal. Not sure
what we'd do if they were not equal other than warn. We wouldn't know which of
them all to take. Patch in hbase-4388 takes the first regions HTD. This is
usually the first updated; later updates could fail so its the first is likely
the 'latest' iteration on HTD I'd guess.
> Address lots of issues with migration from 90 to trunk
> ------------------------------------------------------
>
> Key: HBASE-4389
> URL: https://issues.apache.org/jira/browse/HBASE-4389
> Project: HBase
> Issue Type: Bug
> Components: master, migration
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Priority: Critical
> Fix For: 0.92.0
>
>
> Looking over the migration code that removes HTD from HRI, there are lots of
> issues. This JIRA is to redo this code in a way that will be less bug prone,
> and also future proof.
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