[jira] [Updated] (CASSANDRA-16044) Query SSTable Indexes lazily in token sorted runs for LCS, TWCS or RangeAwaredCompaction

["ZhaoYang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-16044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ZhaoYang updated CASSANDRA-16044:
---------------------------------
    Summary: Query SSTable Indexes lazily in token sorted runs for LCS, TWCS or RangeAwaredCompaction  (was: Query SSTable Indexes in token sorted runs for LCS and TWCS)

> Query SSTable Indexes lazily in token sorted runs for LCS, TWCS or RangeAwaredCompaction
> ----------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-16044
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16044
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Feature/SASI
>            Reporter: ZhaoYang
>            Priority: Normal
>
> Currently SASI searches all SSTable indexes that may include the query partition key and indexed term, but this will cause large IO overhead with range index query (ie. age > 18) when sstable count is huge.
> Proposed improvement: query sstable indexes in token-sorted-runs lazily. When the data in the first few token ranges is sufficient for limit, SASI can reduce the overhead of searching sstable indexes for the remaining ranges.



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