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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-5250) Improve LeveledScanner work estimation
Date Wed, 20 Mar 2013 15:07:15 GMT


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:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Marcus Eriksson
>              Labels: compaction
>         Attachments: 0001-CASSANDRA-5250.patch
> See

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