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Posted to commits@cassandra.apache.org by "Michael Shuler (Jira)" <ji...@apache.org> on 2019/10/29 19:24:00 UTC
[jira] [Updated] (CASSANDRA-15215) VIntCoding should read and write
more efficiently
[ https://issues.apache.org/jira/browse/CASSANDRA-15215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Shuler updated CASSANDRA-15215:
---------------------------------------
Fix Version/s: (was: 4.0.x)
4.x
> VIntCoding should read and write more efficiently
> -------------------------------------------------
>
> Key: CASSANDRA-15215
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15215
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Compaction, Local/SSTable
> Reporter: Benedict Elliott Smith
> Priority: Normal
> Fix For: 3.0.x, 3.11.x, 4.x
>
>
> Most vints occupy significantly fewer than 8 bytes, and most buffers have >= 8 bytes spare, in which case we can construct the relevant bytes in a register and memcpy them to the correct position. Since we read and write a lot of vints, this waste is probably measurable, particularly during compaction and flush, and can probably be considered a performance bug.
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