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HBASE-21462 Add note for CopyTable section explaining it does not per…
…form a diff, but a full write from source to target

Signed-off-by: Josh Elser <elserj@apache.org>
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wchevreuil committed Jul 16, 2019
1 parent cc38de1 commit 72e58a8fed29be3f1b274fb17f46e6632f9064a3
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@@ -528,6 +528,13 @@ Caching for the input Scan is configured via `hbase.client.scanner.caching`
By default, CopyTable utility only copies the latest version of row cells unless `--versions=n` is explicitly specified in the command.
====
.Data Load
[NOTE]
====
CopyTable does not perform a diff, it copies all Cells in between the specified startrow/stoprow starttime/endtime range.
This means that already existing cells with same values will still be copied.
====
See Jonathan Hsieh's link:https://blog.cloudera.com/blog/2012/06/online-hbase-backups-with-copytable-2/[Online
HBase Backups with CopyTable] blog post for more on `CopyTable`.

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