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https://issues.apache.org/jira/browse/CASSANDRA-1936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sylvain Lebresne updated CASSANDRA-1936:
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Attachment: 0001-Put-partitioned-counter-directly-in-column-value.patch
Attaching new patch rebased after #1944 (I've replaced my old patch).
It took a slightly different approach to the 'lazy materialization of value' in
that it introduces a new type of (temporary) column (called CounterUpdateColumn
- since it's a column holding a counter update - but if someone has a better
idea for a name...) that holds the delta until it reaches a replica, at which
time the CounterUpdateColumn is transformed to the equivalent CounterColumn.
I'm keen on this solution for two reasons:
# We don't have to keep a long delta in the CounterColumn that is useless as
soon as the column as been properly initialized.
# I have a patch for #1938 that is taking shape and I do have a use for this
CounterUpdateColumn. I'm also pretty sure it will be necessary when/if we
add the replay markers.
This is a reasonably big patch but this is in good part because of the move in
CounterContext from byte[] to ByteBuffer.
> Fit partitioned counter directly into CounterColumn.value
> ----------------------------------------------------------
>
> Key: CASSANDRA-1936
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1936
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Sylvain Lebresne
> Assignee: Sylvain Lebresne
> Fix For: 0.8
>
> Attachments:
> 0001-Put-partitioned-counter-directly-in-column-value.patch,
> 1936-ALT-0001-lazily-materialize-value.patch
>
> Original Estimate: 8h
> Remaining Estimate: 8h
>
> The current implementation of CounterColumn keeps both the partitioned
> counter and the total value of the counter (that is, the sum of the parts of
> the partitioned counter).
> This waste space and this requires the code to keep both representation in
> sync. This ticket propose to remove the total value from the representation
> and to only calculate it when returning the value to the client.
> NOTE: this breaks the on-disk file format (for counters)
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