Aleksey Yeschenko created CASSANDRA-6506:
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Summary: counters++ split counter context shards into separate
cells
Key: CASSANDRA-6506
URL: https://issues.apache.org/jira/browse/CASSANDRA-6506
Project: Cassandra
Issue Type: Improvement
Reporter: Aleksey Yeschenko
Assignee: Aleksey Yeschenko
Fix For: 2.1
This change is related to, but somewhat orthogonal to CASSANDRA-6504.
Currently all the shard tuples for a given counter cell are packed, in sorted
order, in one binary blob. Thus reconciling N counter cells requires allocating
a new byte buffer capable of holding the union of the two context's shards N-1
times.
For writes, in post CASSANDRA-6504 world, it also means reading more data than
we have to (the complete context, when all we need is the local node's global
shard).
Splitting the context into separate cells, one cell per shard, will help to
improve this. We did a similar thing with super columns for CASSANDRA-3237.
Incidentally, doing this split is now possible thanks to CASSANDRA-3237.
Doing this would also simplify counter reconciliation logic. Getting rid of old
contexts altogether can be done trivially with upgradesstables.
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