Ivan Rakov created IGNITE-5875:
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Summary: Implement memory metric that will signal about uneven
distribution of pages between segments of durable memory
Key: IGNITE-5875
URL: https://issues.apache.org/jira/browse/IGNITE-5875
Project: Ignite
Issue Type: Improvement
Components: persistence
Affects Versions: 2.1
Reporter: Ivan Rakov
Fix For: 2.2
When persistence is enabled, we split memory policy into K equal segments (K =
concurrency level). We calculate hash of pageId to determine segment where page
will be stored.
Pages eviction to disk starts when segment is full. If hash function is bad
enough, one segment can overflow when there are lots of free space, and
evictions can start too early. We want to be able to distinguish such
situations.
Proposed name for metrics: pageHashFunctionScore
Proposed formula: difference between maximum and minimum percentage of segment
fill
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