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Posted to commits@cassandra.apache.org by "C. Scott Andreas (JIRA)" <ji...@apache.org> on 2018/11/19 05:53:01 UTC
[jira] [Updated] (CASSANDRA-8923) Improve MergeIterator performance
for binary prefix comparable data
[ https://issues.apache.org/jira/browse/CASSANDRA-8923?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
C. Scott Andreas updated CASSANDRA-8923:
----------------------------------------
Component/s: Local Write-Read Paths
> Improve MergeIterator performance for binary prefix comparable data
> -------------------------------------------------------------------
>
> Key: CASSANDRA-8923
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8923
> Project: Cassandra
> Issue Type: Improvement
> Components: Local Write-Read Paths
> Reporter: Benedict
> Priority: Minor
> Labels: compaction, performance
>
> Along the same lines as CASSANDRA-8915, only designed to help merges of small partitions, or those with clustering prefixes that are binary prefix (or byte order) comparable. The approach in CASSANDRA-8915 will work well for normal intra-partition merges, but partition keys themselves are typically distributed by hash, meaning there will very rarely be runs of keys owned by a single source. A binary trie based merge would perform significantly better here, and could also be rolled out alongside CASSANDRA-8731 for binary prefix comparable fields.
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