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Posted to commits@cassandra.apache.org by "T Jake Luciani (JIRA)" <ji...@apache.org> on 2010/07/17 02:35:50 UTC
[jira] Commented: (CASSANDRA-1267) Improve performance of cached
row slices
[ https://issues.apache.org/jira/browse/CASSANDRA-1267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889435#action_12889435 ]
T Jake Luciani commented on CASSANDRA-1267:
-------------------------------------------
1) I see. I thought the logic was redundant QueryFilter.isRelevant call so I moved the increment the counter after this call.
2) awesome. this will remove the rest of the latency I was seeing.
3 & 4) sure.
I see you also removed the optimizations made to ColumnFamilyStore removeDeletedStandard() and removeDeletedSuper()
The supplied approach is definatly faster because it avoids the following call
IColumn c = cf.getColumnsMap().get(cname);
For rows with millions of columns this is very slow compared to getEntrySet() pair approach.
> Improve performance of cached row slices
> ----------------------------------------
>
> Key: CASSANDRA-1267
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1267
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: T Jake Luciani
> Assignee: T Jake Luciani
> Priority: Minor
> Fix For: 0.7
>
> Attachments: 1267-v2.txt, cached-row-slice-perf-patch-1.txt
>
>
> In Lucandra, I have a use case to pull all columns for a given row.
> I've noticed that for rows with large numbers of columns this takes much longer than I would think since row caching is enabled.
> After looking into this I see that the cached row is rebuilt and pruned even though I want all columns.
> This patch skips this use case and in my case has improved performance significantly.
> From ~400ms to ~50ms
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