asim: add one voter lease thrashing reproduction

Add a simulation test where the replication factor is set to 1. This highlights lease thrashing, which causes replica and lease count convergence to take upwards of 20 minutes with two nodes. Informs: #108420 Release note: None
cockroachdb · May 16, 2024 · 1fe25bc · 1fe25bc
1 parent 205565c
commit 1fe25bc
Showing 1 changed file with 61 additions and 0 deletions.
diff --git a/pkg/kv/kvserver/asim/tests/testdata/non_rand/one_voter b/pkg/kv/kvserver/asim/tests/testdata/non_rand/one_voter
@@ -0,0 +1,61 @@
+# This test reproduces lease thrashing (#108420) when the replication factor is
+# set to 1.
+gen_cluster nodes=2
+----
+
+gen_ranges ranges=100 repl_factor=1 placement_skew=true
+----
+
+eval duration=20m seed=42
+----
+OK
+
+plot stat=replicas
+----
+----
+
+ 100.00 ┼──────╭────────────╮
+  93.33 ┤     ╭╯ ╰╮         ╰────╮
+  86.67 ┤     │   ╰╮            ╭╰╮───────╮
+  80.00 ┤     │    ╰╮         ╭─╯ ╰╮      ╰─╭╮
+  73.33 ┤    ╭╯     ╰╮       ╭╯    ╰╮      ╭╯╰─────────╮
+  66.67 ┤    │       │     ╭─╯      ╰─╮    │    ╰─╮ ╭──╰─╮╭╮──╭╮╮
+  60.00 ┤   ╭╯       ╰╮    │          │   ╭╯      ╰─╯    ╰╯╰──╯╰────────╮╭╮╭─╮╮
+  53.33 ┤   │         │  ╭─╯          ╰╮ ╭╯                       ╰╯  ╰╯╰╯╰╯ ╰──────────
+  46.67 ┤  ╭╯         ╰╮ │             ╰─╯
+  40.00 ┤  │           │╭╯
+  33.33 ┤  │           ╰╯
+  26.67 ┤ ╭╯
+  20.00 ┤ │
+  13.33 ┤╭╯
+   6.67 ┤│
+   0.00 ┼╯
+                                             replicas
+----
+----
+
+plot stat=leases
+----
+----
+
+ 100.00 ┼──────╮      ╭───╮
+  93.33 ┤      ╰╮    ╭╯   ╰────╮
+  86.67 ┤       │    │         │
+  80.00 ┤       ╰╮  ╭╯         ╰╮    ╭─────╮
+  73.33 ┤        │  │           │   ╭╯     ╰─╮   ╭───╮
+  66.67 ┤        ╰╮╭╯           ╰╮ ╭╯        ╰╮ ╭╯   ╰─╮  ╭──╮
+  60.00 ┤         ││             │ │          │ │      ╰╮╭╯  ╰──╮ ╭──╮
+  53.33 ┤         ╭╯             ╰╮╯          ╰╭╯       │╯      ╰╭╯  ╰──╮───────╭───────
+  46.67 ┤         │╮             ╭╰╮          ╭╯╮       ╰╮      ╭╯╮  ╭──╰───────╯───────
+  40.00 ┤         ││             │ │          │ │      ╭╯╰╮  ╭──╯ ╰──╯
+  33.33 ┤        ╭╯╰╮           ╭╯ ╰╮        ╭╯ ╰╮   ╭─╯  ╰──╯
+  26.67 ┤        │  │           │   ╰╮     ╭─╯   ╰───╯
+  20.00 ┤       ╭╯  ╰╮         ╭╯    ╰─────╯
+  13.33 ┤       │    │         │
+   6.67 ┤      ╭╯    ╰╮   ╭────╯
+   0.00 ┼──────╯      ╰───╯
+                                              leases
+----
+----
+
+# vim:ft=sh