support trickling fsync() on writes
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Key: CASSANDRA-3950
URL: https://issues.apache.org/jira/browse/CASSANDRA-3950
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Peter Schuller
Assignee: Peter Schuller
Fix For: 1.1.0
Attachments: CASSANDRA-3950-1.1.txt
Attaching a patch to support fsync():ing every N megabytes of data written
using sequential writers. The motivation is to avoid the kernel flushing out
pages in bulk.
It makes sense for both platters and SSD:s, but it's particularly good for
SSD:s because the negative consequences of fsync():ing more often are much more
limited than with platters, and the *need* is to some extent greater because of
the fact that with SSD:s you're much more likely to be e.g. streaming data
quickly or compacting quickly, since you're not having to throttle everything
as extremely as with platters, and you easily write fast enough for this to be
a problem if you're targetting good latency at the outliers.
I'm nominating it for 1.1.0 because, if disabled, the probability of this being
a regression seems very low.
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