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Posted to commits@cassandra.apache.org by "ZhaoYang (Jira)" <ji...@apache.org> on 2020/08/11 07:50:00 UTC
[jira] [Created] (CASSANDRA-16044) Query SSTable Indexes in token
sorted runs for LCS and TWCS
ZhaoYang created CASSANDRA-16044:
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Summary: Query SSTable Indexes in token sorted runs for LCS and TWCS
Key: CASSANDRA-16044
URL: https://issues.apache.org/jira/browse/CASSANDRA-16044
Project: Cassandra
Issue Type: Improvement
Components: Feature/SASI
Reporter: ZhaoYang
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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