Piotr Kołaczkowski created CASSANDRA-4983:
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Summary: Improve range wrap-around in CFIF: CFIF shouldn't produce
input splits of very tiny size
Key: CASSANDRA-4983
URL: https://issues.apache.org/jira/browse/CASSANDRA-4983
Project: Cassandra
Issue Type: Improvement
Affects Versions: 1.1.6
Reporter: Piotr Kołaczkowski
Assignee: Piotr Kołaczkowski
Priority: Minor
Currently CFIF splits the wrap-around split into two non-wrap-around splits.
While it simplifies CFRR implementation, this approach has several minor
downsides:
* One of the splits can be extremely small. One of our (picky) customers
suspected there must be a bug, because one of his map tasks executed in 1
second, while all the rest executed in minutes. Also having a very small task
is wasting resources - more resources go to launching the task than doing any
real work.
* The number of map tasks is always one more than the number of (expected rows
/ cassandra.input.split.size). The number of map tasks is always >= 2. This is
confusing customers.
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