[REST] Rip out "transform" feature
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Key: HBASE-5228
URL: https://issues.apache.org/jira/browse/HBASE-5228
Project: HBase
Issue Type: Bug
Affects Versions: 0.90.5, 0.92.0, 0.94.0
Reporter: Andrew Purtell
Assignee: Andrew Purtell
The 'transform' feature, where REST can be instructed, via a table attribute,
to apply a transformation (e.g. base64 encoding or decoding) to a (sub)set of
column values before serving them up to a client or storing them into HBase,
was added some time ago at the request of Jack Levin. I have since come to
regret it, it was not a well thought out feature:
- This is really an application concern.
- It adds significant overhead to request processing: Periodically a
HBaseAdmin is used to retrieve the table descriptor, in order to scan through
table attributes for transformation directives.
I think it is best to rip it out, its a real problem area, and REST should be
no more concerned about data formats than the Java API.
I doubt anyone uses this, not even Jack. Will need to follow up with him to
confirm.
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