cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5250) Improve LeveledScanner work estimation
Date Wed, 20 Mar 2013 15:07:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607685#comment-13607685
] 

Jonathan Ellis commented on CASSANDRA-5250:
-------------------------------------------

I would say, go ahead and rip out EmptyCompactionScanner.

I was also hoping that we could get a better estimate for sstables where the range we're scanning
is only part of the sstable.  One way would be to do lookups against our in-memory IndexSummary
for the start and end of the range, and assume that 1/10 of the rows in the summary correspond
to 1/10 of the size on disk.  Obviously not 100% accurate but a lot better than throwing the
entire sstable size in each time.
                
> Improve LeveledScanner work estimation
> --------------------------------------
>
>                 Key: CASSANDRA-5250
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5250
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Marcus Eriksson
>              Labels: compaction
>         Attachments: 0001-CASSANDRA-5250.patch
>
>
> See https://issues.apache.org/jira/browse/CASSANDRA-5222?focusedCommentId=13577420&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13577420

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message