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b78bab7286
Raft randomized nemesis test was improved by adding some more chaos: randomizing the network delay, server configuration, ticking speed of servers. This allowed to catch a serious bug, which is fixed in the first patch. The patchset also fixes bugs in the test itself and adds quality of life improvements such as better diagnostics when inconsistency is detected. * kbr/nemesis-random-v1: test: raft: randomized_nemesis_test: print state of each state machine when detecting inconsistency test: raft: randomized_nemesis_test: print details when detecting inconsistency test: raft: randomized_nemesis_test: print snapshot details when taking/loading snapshots in `impure_state_machine` test: raft: randomized_nemesis_test: keep server id in impure_state_machine test: raft: randomized_nemesis_test: frequent snapshotting configuration test: raft: randomized_nemesis_test: tick servers at different speeds in generator test test: raft: randomized_nemesis_test: simplify ticker test: raft: randomized_nemesis_test: randomize network delay test: raft: randomized_nemesis_test: fix use-after-free in `environment::crash()` test: raft: randomized_nemesis_test: fix use-after-free in two-way rpc functions test: raft: randomized_nemesis_test: rpc: don't propagate `gate_closed_exception` outside test: raft: randomized_nemesis_test: fix obsolete comment raft: fsm: print configuration entries appearing in the log raft: `operator<<(ostream&, ...)` implementation for `server_address` and `configuration` raft: server: abort snapshot applications before waiting for rpc abort raft: server: logging fix raft: fsm: don't advance commit index beyond matched entries