Enumerate ACID properties of HBase in a well defined spec
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Key: HBASE-2294
URL: https://issues.apache.org/jira/browse/HBASE-2294
Project: Hadoop HBase
Issue Type: Task
Components: documentation
Reporter: Todd Lipcon
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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