From 91e4fc24e785a25884125df6762ab2304bf8908b Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@redhat.com>
Date: Tue, 3 Sep 2019 10:54:47 -0500
Subject: [PATCH] common: default pg_autoscale_mode=on for new pools

Signed-off-by: Sage Weil <sage@redhat.com>
---
 PendingReleaseNotes                    | 7 +++++++
 src/common/options.cc                  | 2 +-
 src/test/cli/osdmaptool/clobber.t      | 4 ++--
 src/test/cli/osdmaptool/create-print.t | 4 ++--
 src/test/cli/osdmaptool/create-racks.t | 4 ++--
 5 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 1f819531271..6e42ef314cf 100644
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -135,3 +135,10 @@
 
 * New OSD daemon command dump_scrub_reservations which reveals the
   scrub reservations that are held for local (primary) and remote (replica) PGs.
+
+* The ``pg_autoscale_mode`` is now set to ``on`` by default for newly
+  created pools, which means that Ceph will automatically manage the
+  number of PGs.  To change this behavior, or to learn more about PG
+  autoscaling, see :ref:`pg-autoscaler`.  Note that existing pools in
+  upgraded clusters will still be set to ``warn`` by default.
+
diff --git a/src/common/options.cc b/src/common/options.cc
index 5ccc6142046..e5bca3c1841 100644
--- a/src/common/options.cc
+++ b/src/common/options.cc
@@ -2625,7 +2625,7 @@ std::vector<Option> get_global_options() {
     .set_description(""),
 
     Option("osd_pool_default_pg_autoscale_mode", Option::TYPE_STR, Option::LEVEL_ADVANCED)
-    .set_default("warn")
+    .set_default("on")
     .set_flag(Option::FLAG_RUNTIME)
     .set_enum_allowed({"off", "warn", "on"})
     .set_description("Default PG autoscaling behavior for new pools"),
diff --git a/src/test/cli/osdmaptool/clobber.t b/src/test/cli/osdmaptool/clobber.t
index e44c5dbe7c6..c78138c9b63 100644
--- a/src/test/cli/osdmaptool/clobber.t
+++ b/src/test/cli/osdmaptool/clobber.t
@@ -25,7 +25,7 @@
   nearfull_ratio 0
   min_compat_client jewel
   
-  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 192 pgp_num 192 autoscale_mode warn last_change 0 flags hashpspool stripe_width 0 application rbd
+  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 192 pgp_num 192 autoscale_mode on last_change 0 flags hashpspool stripe_width 0 application rbd
   
   max_osd 3
   
@@ -51,7 +51,7 @@
   nearfull_ratio 0
   min_compat_client jewel
   
-  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 64 pgp_num 64 autoscale_mode warn last_change 0 flags hashpspool stripe_width 0 application rbd
+  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 64 pgp_num 64 autoscale_mode on last_change 0 flags hashpspool stripe_width 0 application rbd
   
   max_osd 1
   
diff --git a/src/test/cli/osdmaptool/create-print.t b/src/test/cli/osdmaptool/create-print.t
index cb608a66eca..7f3a033c2d4 100644
--- a/src/test/cli/osdmaptool/create-print.t
+++ b/src/test/cli/osdmaptool/create-print.t
@@ -85,7 +85,7 @@
   nearfull_ratio 0
   min_compat_client jewel
   
-  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 192 pgp_num 192 autoscale_mode warn last_change 0 flags hashpspool stripe_width 0 application rbd
+  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 192 pgp_num 192 autoscale_mode on last_change 0 flags hashpspool stripe_width 0 application rbd
   
   max_osd 3
   
@@ -94,5 +94,5 @@
   osdmaptool: writing epoch 1 to myosdmap
   $ osdmaptool --print myosdmap | grep 'pool 1'
   osdmaptool: osdmap file 'myosdmap'
-  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 192 pgp_num 192 autoscale_mode warn last_change 0 flags hashpspool stripe_width 0 application rbd
+  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 192 pgp_num 192 autoscale_mode on last_change 0 flags hashpspool stripe_width 0 application rbd
   $ rm -f myosdmap
diff --git a/src/test/cli/osdmaptool/create-racks.t b/src/test/cli/osdmaptool/create-racks.t
index 5fe3cf874c8..6a27cb07de5 100644
--- a/src/test/cli/osdmaptool/create-racks.t
+++ b/src/test/cli/osdmaptool/create-racks.t
@@ -797,7 +797,7 @@
   nearfull_ratio 0
   min_compat_client jewel
   
-  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 15296 pgp_num 15296 autoscale_mode warn last_change 0 flags hashpspool stripe_width 0 application rbd
+  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 15296 pgp_num 15296 autoscale_mode on last_change 0 flags hashpspool stripe_width 0 application rbd
   
   max_osd 239
   
@@ -807,5 +807,5 @@
   osdmaptool: writing epoch 1 to om
   $ osdmaptool --print om | grep 'pool 1'
   osdmaptool: osdmap file 'om'
-  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 15296 pgp_num 15296 autoscale_mode warn last_change 0 flags hashpspool stripe_width 0 application rbd
+  pool 1 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 15296 pgp_num 15296 autoscale_mode on last_change 0 flags hashpspool stripe_width 0 application rbd
   $ rm -f om
-- 
2.47.3