Chen Luo created ASTERIXDB-2252:
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Summary: Improve scan efficiency of LSM components
Key: ASTERIXDB-2252
URL: https://issues.apache.org/jira/browse/ASTERIXDB-2252
Project: Apache AsterixDB
Issue Type: Improvement
Components: STO - Storage
Reporter: Chen Luo
Assignee: Chen Luo
The current (full) scan on LSM components is not very efficient, especially on
hard disks, in two aspects:
# We often need to use a priority queue to merge results from multiple
components. However, we only read a page at a time, which incurs a lot of
random I/O overhead on hard disks.
# Full scan can often fill up (and clean up) the buffer cache. This problem is
especially notable when we do merge. After a merge operation, the buffer cache
would be filled up pages of old components, which would not be accessed by
future queries.
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