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https://issues.apache.org/jira/browse/HBASE-19582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16300595#comment-16300595
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Philippe Laflamme commented on HBASE-19582:
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Thanks for the clear response. I have to admit that Append is not well (at
all?) documented. Even just to understand that it literally concatenates
values, I had to read the implementation in HRegion. I probably missed it, but
I could not find any documentation of the expected behaviour. Here are some of
the places I hunted it down (and failed):
https://hbase.apache.org/book.html (Append is mentioned a few times, but never
itself documented)
https://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/Append.html
(doesn't specifically say how this mutates the data)
https://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/Table.html#append-org.apache.hadoop.hbase.client.Append-
(again, doesn't say how the data is mutated)
Obviously, one can probably infer what "append" might mean, but a formal
definition would definitely be an improvement. Also, the behaviour in face of
cell-level TTL / compactions would also be important.
Thanks again for the clarification!
> Tags on append doesn't behave like expected
> -------------------------------------------
>
> Key: HBASE-19582
> URL: https://issues.apache.org/jira/browse/HBASE-19582
> Project: HBase
> Issue Type: Bug
> Components: Client
> Affects Versions: 2.0.0-alpha-4
> Reporter: Jean-Marc Spaggiari
>
> When appending a tag an HBase cell, they seems to not really be append be
> live their own life. In the example below, I put a cell, append the TTL, and
> we can see between the 2 scans that only the TTL append cell expires. I was
> expecting those 2 cells to become one and expire together. This can be easily
> figured by looking at the returned timestamp from the scan.
> {code}
> hbase(main):082:0> put 't1', 'r1', 'f1:c1', 'value'
> 0 row(s) in 0.1350 seconds
> hbase(main):083:0> append 't1', 'r1', 'f1:c1', '', { TTL => 5000 }
> 0 row(s) in 0.0080 seconds
> hbase(main):084:0> scan 't1'
> ROW COLUMN+CELL
>
>
> r1 column=f1:c1,
> timestamp=1513879615014, value=value
>
> 1 row(s) in 0.0730 seconds
> hbase(main):085:0> scan 't1'
> ROW COLUMN+CELL
>
>
> r1 column=f1:c1,
> timestamp=1513879599375, value=value
>
> 1 row(s) in 0.0500 seconds
> {code}
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