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https://issues.apache.org/jira/browse/CASSANDRA-20092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17942283#comment-17942283
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Jordan West edited comment on CASSANDRA-20092 at 4/9/25 7:11 PM:
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I've been working on the backport for this ticket to 5.0 as discussed on the
mailing list. Figure updates are best put here since their isn't a separate
tracking ticket. One note is in my backport I have addressed CASSANDRA-20538 as
well for 5.0 branch (was planning to treat 20538 solely for trunk but I am
happy to split it up)
I've also included the fix in CASSANDRA-20396 in the backport
[Branch|https://github.com/jrwest/cassandra/tree/jwest/20092-5.0-backport]
[Tests|https://app.circleci.com/pipelines/github/jrwest/cassandra/234/workflows/9a1656ca-4e3f-4373-8afa-9e668bbf4a6e]
(nothing failing that is related, just two failures in TestBootstrap that I
have seen before)
was (Author: jrwest):
I've been working on the backport for this ticket to 5.0 as discussed on the
mailing list. Figure updates are best put here since their isn't a separate
tracking ticket. One note is in my backport I have addressed CASSANDRA-20538 as
well for 5.0 branch (was planning to treat 20538 solely for trunk but I am
happy to split it up)
[Branch|https://github.com/jrwest/cassandra/tree/jwest/20092-5.0-backport]
[Tests|https://app.circleci.com/pipelines/github/jrwest/cassandra/234/workflows/9a1656ca-4e3f-4373-8afa-9e668bbf4a6e]
(nothing failing that is related, just two failures in TestBootstrap that I
have seen before)
> SSTableScanner can be vastly simplified for compaction
> ------------------------------------------------------
>
> Key: CASSANDRA-20092
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20092
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Compaction
> Reporter: Branimir Lambov
> Assignee: Branimir Lambov
> Priority: Normal
> Fix For: 5.1
>
> Attachments: ci_summary_thelastpickle_mck-20092-5.0_154.html,
> results_details_thelastpickle_mck-20092-5.0_154.tar.xz
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> One of the main bottlenecks for compaction performance is its use of the
> {{SSTableScanner}} class, whose main purpose is to implement partition range
> queries and as such supports filtering by row and column that is not helpful
> to compaction. To implement the latter it must rely on the sstable's index,
> adding a lot of complexity and inefficiency.
> Implementing a simpler version of a scanner that reads off the data file
> directly for given spans of offsets would speed up compaction significantly.
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