Pre-allocated, Recycled Commitlog Segment Files
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Key: CASSANDRA-3411
URL: https://issues.apache.org/jira/browse/CASSANDRA-3411
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Rick Branson
Priority: Minor
An approach for improving commitlog performance is to pre-allocate the full
128MB segment files and reuse them once all the mutations have been flushed.
Pre-allocation allows writes to be performed without modifying the file size
metadata, and should (in theory) allow the filesystem to allocate a contiguous
block of space for the file. Recycling the segment files prevents the overhead
of pre-allocation from impacting overall performance.
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