distribute leftover lamports #7396
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Codecov Report
@@ Coverage Diff @@
## master #7396 +/- ##
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+ Coverage 68.4% 80.6% +12.2%
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Files 244 244
Lines 56475 47779 -8696
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- Hits 38658 38548 -110
+ Misses 17817 9231 -8586 |
| }); | ||
| // Sort first by stake and then by pubkey for determinism | ||
| node_stakes.sort_by( | ||
| |(pubkey1, staked1), (pubkey2, staked2)| match staked2.cmp(staked1) { |
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this sort doesn't need to be stable, does it? you should be safe sorting merely by stake...
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@rob-solana If I sort by stake only, it could lead to indeterminism, as the order might not be guaranteed for node with same stake amount. Which could result in rare cases, different distribution of leftover lamports.
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are you testing for that?
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@rob-solana not specifically. Let me add a separate test scenario for this, just for my assurance.
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@rob-solana Added a scenario in test-case.
runtime/src/bank.rs
Outdated
| let node_stakes_and_rent = node_stakes | ||
| .iter() | ||
| .map(|(pubkey, staked)| { | ||
| let rent_in_initial_round = |
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rent_to_be_paid was just as good a name
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could also be rent_share
mergify
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dismissed
rob-solana’s stale review
Pull request has been modified.
Problem
Currently, rent payment to validator is as a fraction of collected rent in accordance with their stake weight. Since lamports are atomic, the calculation results in leftover lamports (for N validators, maximum N lamports), which are then lost.
Proposed Solution
Distribute those leftover lamports among the validators from descending order of stake weight.
Each validator gets 1 lamport from the leftover lamports, until all leftover lamports are exhausted.
Fixes #7381