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Posted to commits@cassandra.apache.org by "Brandon Williams (JIRA)" <ji...@apache.org> on 2010/07/15 18:21:52 UTC
[jira] Updated: (CASSANDRA-1155) keep persistent row statistics
[ https://issues.apache.org/jira/browse/CASSANDRA-1155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Brandon Williams updated CASSANDRA-1155:
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Attachment: 1155.txt
Patch to store persistent statistics in the system keyspace. Since these need to be per-sstable, I left min/max/mean in CFS as they were.
> keep persistent row statistics
> ------------------------------
>
> Key: CASSANDRA-1155
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1155
> Project: Cassandra
> Issue Type: Sub-task
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Brandon Williams
> Fix For: 0.7
>
> Attachments: 1155.txt
>
>
> during flush and compaction we should keep row size statistics using EstimatedHistogram (column count, and row size), replacing min/max/total sizes in CFS.
> having this detail will let us estimate, given an index CF, how many nodes we need to query to get the number of matching rows requested by the client.
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