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

Signed-off-by: Josh Elser <elserj@apache.org>
This commit is contained in:
Wellington Chevreuil 2019-07-16 18:36:43 +01:00
parent cc38de1a39
commit 72e58a8fed
1 changed files with 7 additions and 0 deletions
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src/main/asciidoc/_chapters/ops_mgt.adoc
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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. 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 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`. HBase Backups with CopyTable] blog post for more on `CopyTable`.