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https://issues.apache.org/jira/browse/HBASE-8626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13669131#comment-13669131
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Vinod commented on HBASE-8626:
------------------------------
In the use-case above, the client does not know upfront what all columns the
row/column-family has. I guess this would be a common use-case in schema-free
data stores like HBase.
The client now gets a new copy of the entire row, essentially new data for that
row which might not have all the columns the row has currently. So it needs to
atomically _replace_ the entire row with this new data.
So one way I could think of is to use RowMutations to first delete entire
column family and then Put the new columns to same column family.
Another way would be to read the row first to figure out the current columns
and then create a non-overlapping set of Puts and Deletes and add those to the
RowMutations. But this a check-then-act scenario which can cause inconsistency.
Also this causes multiple round trips to the server.
Any other ways to address this use-case?
> RowMutations fail when Delete and Put on same columnFamily/column/row
> ---------------------------------------------------------------------
>
> Key: HBASE-8626
> URL: https://issues.apache.org/jira/browse/HBASE-8626
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.94.7, 0.95.0
> Environment: Ubuntu 12.04, HBase 0.94.7
> Reporter: Vinod
> Assignee: Ted Yu
> Fix For: 0.94.7, 0.95.1
>
> Attachments: 8626-v1.txt, TestRowMutations.java,
> tests_for_row_mutations1.patch
>
>
> When RowMutations have a Delete followed by Put to same column family or
> columns or rows, only the Delete is happening while the Put is ignored so
> atomicity of RowMutations is broken for such cases.
> Attached is a unit test where the following tests are failing:
> - testDeleteCFThenPutInSameCF: Delete a column family and then Put to same
> column family.
> - testDeleteColumnThenPutSameColumn: Delete a column and then Put to same
> column.
> - testDeleteRowThenPutSameRow: Delete a row and then Put to same row
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