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https://issues.apache.org/jira/browse/CASSANDRA-1142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brandon Williams updated CASSANDRA-1142:
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Attachment: (was: 1142.txt)
> redesign hinted handoff schema
> ------------------------------
>
> Key: CASSANDRA-1142
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1142
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Brandon Williams
> Fix For: 0.7
>
> Attachments: 1142.txt
>
>
> Currently, the HH schema looks like this:
> * For each table (keyspace), there is a row in the system hints CF.
> * SuperColumns in that row are keys for which we have hinted data.
> * Subcolumns names within that supercolumn are host IPs. Subcolumn values
> are always empty.
> * Instead, we store the row data "normally" in the application table it
> belongs in.
> This has the drawback that we need to scan the entire hints data set to
> deliver hints to a given endpoint. I propose instead we do this:
> * Row keys are endpoints for which we have hints.
> * SuperColumns in that row are keys for which we have hinted data.
> * Subcolumns names within that supercolumn are Keyspace + CF names, joined
> with a '-' (which is an illegal character in CF names, so it's safe to use
> here)
> This makes looking up hints for a single endpoint efficient, as well as
> making it so we only have to read data from CFs for which we actually have
> data for the key.
> Actual row data continues to be stored in application tables.
> Makes sense to do this after CASSANDRA-1141.
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