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https://issues.apache.org/jira/browse/HBASE-1215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721999#action_12721999
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Jonathan Gray commented on HBASE-1215:
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We've started to think about data migration. It's most likely going to be
necessary to perform full major compactions on all tables prior to migrating,
especially if we migrate data at the HDFS level.
Besides making life easier by having only a single StoreFile per Store, and not
worrying about sorted merging across them, we also need to enforce deletes as
much as possible as these changed significantly in 0.20.
> [migration] 0.19.0 -> 0.20.0 migration (hfile, HCD changes, HSK changes)
> ------------------------------------------------------------------------
>
> Key: HBASE-1215
> URL: https://issues.apache.org/jira/browse/HBASE-1215
> Project: Hadoop HBase
> Issue Type: Task
> Reporter: stack
> Priority: Blocker
> Fix For: 0.20.0
>
>
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