Istvan Toth created HBASE-28556:
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Summary: Reduce memory copying in Rest server when converting
CellModel to Protobuf
Key: HBASE-28556
URL: https://issues.apache.org/jira/browse/HBASE-28556
Project: HBase
Issue Type: Improvement
Components: REST
Reporter: Istvan Toth
The REST server does a lot of unneccessary coping, which could be avoided at
least for protobuf encoding.
- It uses ByteStringer to handle ByteBuffer backed Cells. However, it uses the
client API, so it sjpuld never encounter ByteBuffer backed cells.
- It clones everything from the cells (sometimes multiple times) before
serializing to protbuf.
We could mimic the structure in Cell, with array, offset and length for each
field, and use the appropriate protobuf setters to avoid the extra copies.
There may or may not be a way to do the same for JSON and XML via jax-rs, I
don't know the frameworks well enough to tell, but if not, we could just do the
copying in the getters for them.
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