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https://issues.apache.org/jira/browse/HBASE-2294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854747#action_12854747
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Todd Lipcon commented on HBASE-2294:
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Yep, that makes sense - we should add the unit tests that 'prove it', and then
commit this with the tests once they pass
> Enumerate ACID properties of HBase in a well defined spec
> ---------------------------------------------------------
>
> Key: HBASE-2294
> URL: https://issues.apache.org/jira/browse/HBASE-2294
> Project: Hadoop HBase
> Issue Type: Task
> Components: documentation
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Blocker
> Fix For: 0.20.5, 0.21.0
>
> Attachments: formatting_mods-v2.patch, formatting_mods.patch,
> hbase-2294.patch
>
>
> It's not written down anywhere what the guarantees are for each operation in
> HBase with regard to the various ACID properties. I think the developers know
> the answers to these questions, but we need a clear spec for people building
> systems on top of HBase. Here are a few sample questions we should endeavor
> to answer:
> - For a multicell put within a CF, is the update made durable atomically?
> - For a put across CFs, is the update made durable atomically?
> - Can a read see a row that hasn't been sync()ed to the HLog?
> - What isolation do scanners have? Somewhere between snapshot isolation and
> no isolation?
> - After a client receives a "success" for a write operation, is that
> operation guaranteed to be visible to all other clients?
> etc
> I see this JIRA as having several points of discussion:
> - Evaluation of what the current state of affairs is
> - Evaluate whether we currently provide any guarantees that aren't useful to
> users of the system (perhaps we can drop in exchange for performance)
> - Evaluate whether we are missing any guarantees that would be useful to
> users of the system
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