Benedict created CASSANDRA-6692:
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Summary: AtomicBTreeColumns Improvements
Key: CASSANDRA-6692
URL: https://issues.apache.org/jira/browse/CASSANDRA-6692
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Benedict
Assignee: Benedict
Priority: Minor
Fix For: 2.1
There are two improvements to make to the BTree code that should help:
1) It turns out Stack Allocation is more rubbish than we had hoped, and so the
fast route actually allocates garbage. It's unlikely this reduces throughput,
but the increased young-gen pressure is probably unwelcome. I propose to remove
the fast route for now.
2) It is not uncommon to race to perform an update, so that the new values are
actually out-of-date when we come to modify the tree. In this case the update
should recognise that the original (portion of) the tree has not been modified,
and simply return it, without allocating a new one.
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