Ivan Bessonov created IGNITE-21906:
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Summary: Consider disabling inline in PK index by default
Key: IGNITE-21906
URL: https://issues.apache.org/jira/browse/IGNITE-21906
Project: Ignite
Issue Type: Improvement
Reporter: Ivan Bessonov
In aipersist/aimem we attempt to inline binary tuples into pages for hash
indexes by default. This, in theory, saves us from the necessity of accessing
binary tuples from data pages for comparison, which is slower than comparing
inlined data.
But, assuming the good hash distribution, we would only have to do the real
comparison for the matched tuple. At the same time, inlined data might be
substantially larger than hash+link, meaning that B+Tree with inlined data has
bigger height, which correlates with slower search speed.
So, we have both pros and cons for inlining, and the only real way to reconcile
them is to compare them with some benchmarks. This is exactly what I propose.
TL;DR: force inline size to be 0 for hash indices and benchmark for put/get
operations, with large enough amount of data.
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