Andrew Purtell created HBASE-9681:
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Summary: Basic codec negotiation
Key: HBASE-9681
URL: https://issues.apache.org/jira/browse/HBASE-9681
Project: HBase
Issue Type: Sub-task
Affects Versions: 0.98.0
Reporter: Andrew Purtell
Basic codec negotiation:
There should be a default codec used for cell encoding over the RPC connection.
This should be configurable in the site file.
The client can optionally send a message, a manufactured "call" that would
otherwise be invalid in some way, to the server asking for a list of supported
cell codecs. An older server should simply send back an error because the
request is invalid except to servers supporting this feature. A server
supporting this feature should send back the requested information or an error
indication if something went wrong.
The client can optionally send a message, a manufactured "call" that would
otherwise be invalid in some way, to the server asking for it to use a given
codec for all further communication. Otherwise the server will continue to use
the default codec. The server will send back a call response acknowledging the
change or an error indication if the request cannot be honored.
Server configuration should support mappings from one codec type to another. We
need to handle the case where the server has a codec available that extends the
requested type but overrides some behavior in the base class, and this is what
should be used in lieu of the base type. It must also be possible to choose an
alternate default codec which stands in for the default codec, is compatible
with client expectations, but changes the server side behavior as needed in the
absence of negotiation.
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