[SOLR-7787] Fork HyperLogLog and remove fastutil dependency

• Type: Task
• Status: Closed
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 5.3, 6.0
• Assignee: Dawid Weiss
• Reporter: Dawid Weiss
• Created: 13/Jul/15 13:40
• Updated: 09/May/16 18:57
• Resolved: 17/Jul/15 11:35

Description

So fastutil is now part of Solr's distribution (because the stats component uses hyperloglog library, which in turn requires fastutil). I looked at the actual uses of fastutil and only java-hll uses it (and only a few classes).

I've created a fork that uses HPPC instead (also randomized all tests, they pass). Since it's a relatively simple package I think it could be forked and imported into Solr's codebase entirely. I'd make a pull request but I see Hoss also created a few comments/ PRs and none of them received any attention; the project seems to be stale or dead?

Issue Links

• relates to: SOLR-7802 TestDistributedStatsComponentCardinality failure