Is there a reason the retry code in src/libstore/filetransfer.cc requires random?
https://github.com/NixOS/nix/blob/96ba7f9d77d6f2fd8fd64aafc50dd8c850e8a902/src/libstore/filetransfer.cc#L505

This part specifically:

int ms = request.baseRetryTimeMs * std::pow(2.0f, attempt - 1 + std::uniform_real_distribution<>(0.0, 0.5)(fileTransfer.mt19937));

In reply to @bjth:matrix.org

Is there a reason the retry code in src/libstore/filetransfer.cc requires random?
https://github.com/NixOS/nix/blob/96ba7f9d77d6f2fd8fd64aafc50dd8c850e8a902/src/libstore/filetransfer.cc#L505

This part specifically:

int ms = request.baseRetryTimeMs * std::pow(2.0f, attempt - 1 + std::uniform_real_distribution<>(0.0, 0.5)(fileTransfer.mt19937));

In reply to @bjth:matrix.org

Is there a reason the retry code in src/libstore/filetransfer.cc requires random?
https://github.com/NixOS/nix/blob/96ba7f9d77d6f2fd8fd64aafc50dd8c850e8a902/src/libstore/filetransfer.cc#L505

This part specifically:

int ms = request.baseRetryTimeMs * std::pow(2.0f, attempt - 1 + std::uniform_real_distribution<>(0.0, 0.5)(fileTransfer.mt19937));

$ , sqlite3 ~/.cache/nix/eval-cache-v5/fe647c02b237098e3a474c6fbc5b8ad9e30c79afa4ae52c3d2457c9100df4887.sqlite .dump
PRAGMA foreign_keys=OFF;
BEGIN TRANSACTION;
CREATE TABLE Attributes (
    parent      integer not null,
    name        text,
    type        integer not null,
    value       text,
    context     text,
    primary key (parent, name)
);
INSERT INTO Attributes VALUES(0,'',0,NULL,NULL);
INSERT INTO Attributes VALUES(1,'packages',0,NULL,NULL);
INSERT INTO Attributes VALUES(3,'nixosConfigurations',3,NULL,NULL);
INSERT INTO Attributes VALUES(2,'x86_64-linux',1,NULL,NULL);
INSERT INTO Attributes VALUES(5,'nixf-tidy-nice',0,NULL,NULL);
INSERT INTO Attributes VALUES(1,'legacyPackages',0,NULL,NULL);
INSERT INTO Attributes VALUES(8,'nixosConfigurations',3,NULL,NULL);
INSERT INTO Attributes VALUES(7,'x86_64-linux',1,NULL,NULL);
INSERT INTO Attributes VALUES(1,'nixosConfigurations',0,NULL,NULL);
INSERT INTO Attributes VALUES(11,'john',0,NULL,NULL);
INSERT INTO Attributes VALUES(12,'config',0,NULL,NULL);
INSERT INTO Attributes VALUES(13,'system',0,NULL,NULL);
INSERT INTO Attributes VALUES(14,'build',0,NULL,NULL);
INSERT INTO Attributes VALUES(15,'toplevel',0,NULL,NULL);
COMMIT;