Jonathan Ellis created CASSANDRA-5020:
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Summary: Time to switch back to byte[] internally?
Key: CASSANDRA-5020
URL: https://issues.apache.org/jira/browse/CASSANDRA-5020
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Jonathan Ellis
Fix For: 1.3
We switched to ByteBuffer for column names and values back in 0.7, which gave
us a short term performance boost on mmap'd reads, but we gave that up when we
switched to refcounted sstables in 1.0. (refcounting all the way up the read
path would be too painful, so we copy into an on-heap buffer when reading from
an sstable, then release the reference.)
A HeapByteBuffer wastes a lot of memory compared to a byte[] (5 more ints, a
long, and a boolean).
The hard problem here is how to do the arena allocation we do on writes, which
has been very successful in reducing STW CMS from heap fragmentation.
ByteBuffer is a good fit there.
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