xin jin created CASSANDRA-13904:
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Summary: Performance improvement of Cassandra UDF/UDA
Key: CASSANDRA-13904
URL: https://issues.apache.org/jira/browse/CASSANDRA-13904
Project: Cassandra
Issue Type: Improvement
Components: CQL
Reporter: xin jin
Priority: Critical
Fix For: 3.11.x
Hi All,
We have made a few experiments and found that running query with direct UDF
execution is ten time more faster than the async UDF execution. The in-line
comment: "Using async UDF execution is expensive (adds about 100us overhead per
invocation on a Core-i7 MBPr)”
https://insight.io/github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/cql3/functions/UDFunction.java?line=293
show that this is a known behavior. My questions are as below:
1. What are the main pros and cons of these two methods? Can I find any
documents that discuss this?
2. Are there any plans to improve the performance of using async UDF? A simple
way come to my mind is to use some sort of batch method, e.g., replace current
row by row method with some rows by some rows. Are there any concerns on this?
3. How people solve this performance issue in general? It seems this
performance issue is not an urgent or an important issue to solve because it is
known and it is still there. Therefore people must have some sort of good
solution solving this issue.
I really appreciate your comments in advance.
Best regards,
Xin
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