Benjamin Lerer created CASSANDRA-16717:
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Summary: The fetching strategy can be optimized for CL.ONE and
CL.LOCAL_ONE
Key: CASSANDRA-16717
URL: https://issues.apache.org/jira/browse/CASSANDRA-16717
Project: Cassandra
Issue Type: Improvement
Reporter: Benjamin Lerer
Assignee: Benjamin Lerer
The current {{ColumnFilter}} fetching strategy has been implemented in order to
guaranty the CQL semantics around empty vs non-existing rows. It has also some
importance regarding read-repair (CASSANDRA-16710). Nevertheless, reads at
{{CL.ONE}} and at {{CL.LOCAL_ONE}} do not use read-repair and do not require
more columns than the queried ones as those cannot be deleted by column
deletions present on other nodes. By consequence, having {{ColumnFilter}}
fetching only the queried columns should improve query speed, by reducing the
number of SSTable reads for queries fetching specific rows and reducing the
amound of data serialized and transfered between nodes (if the data is not
local).
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