afr: Automagic unsplit-brain by [ctime|mtime|size|majority]

Introduce cluster.favorite-child-policy which when enabled with
[ctime|mtime|size|majority], automatically heals files that are in
split-brian.

The majority policy will not pick a source if there is no majority.
The other three policies pick the first brick with a valid reply and
non-zero ctime/mtime/size as source.

Change-Id: I3c099a0404082213860f74f2c9b4d207cfaedb76
BUG: 1328224
Original-author: Richard Wareing <rwareing@fb.com>
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-on: http://review.gluster.org/14026
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anuradha Talur <atalur@redhat.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>

1 files changed, 175 insertions, 0 deletions

diff --git a/tests/basic/afr/split-brain-favorite-child-policy.t b/tests/basic/afr/split-brain-favorite-child-policy.t
new file mode 100644
index 00000000000..66fcd67a031
--- /dev/null
+++ b/tests/basic/afr/split-brain-favorite-child-policy.t
@@ -0,0 +1,175 @@
+#!/bin/bash
+
+#Test the split-brain resolution CLI commands.
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+
+cleanup;
+
+TEST glusterd
+TEST pidof glusterd
+
+#Create replica 2 volume
+TEST $CLI volume create $V0 replica 2 $H0:$B0/${V0}{0,1}
+TEST $CLI volume set $V0 performance.write-behind off
+TEST $CLI volume set $V0 cluster.self-heal-daemon off
+TEST $CLI volume set $V0 cluster.entry-self-heal off
+TEST $CLI volume set $V0 cluster.data-self-heal off
+TEST $CLI volume set $V0 cluster.metadata-self-heal off
+TEST $CLI volume start $V0
+TEST glusterfs --volfile-id=/$V0 --volfile-server=$H0 $M0 --attribute-timeout=0 --entry-timeout=0
+TEST touch $M0/file
+
+############ Healing using favorite-child-policy = ctime #################
+TEST kill_brick $V0 $H0 $B0/${V0}0
+TEST dd if=/dev/urandom of=$M0/file bs=1024 count=1024
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 0
+TEST kill_brick $V0 $H0 $B0/${V0}1
+TEST dd if=/dev/urandom of=$M0/file bs=1024 count=1024
+
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 1
+TEST $CLI volume set $V0 cluster.self-heal-daemon on
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "Y" glustershd_up_status
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 1
+TEST $CLI volume heal $V0
+
+#file fill in split-brain
+cat $M0/file > /dev/null
+EXPECT "1" echo $?
+
+#We know that the first brick has latest ctime.
+LATEST_CTIME_MD5=$(md5sum $B0/${V0}0/file | cut -d\  -f1)
+TEST $CLI volume set $V0 cluster.favorite-child-policy ctime
+TEST $CLI volume heal $V0
+EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
+cat $M0/file > /dev/null
+EXPECT "0" echo $?
+HEALED_MD5=$(md5sum $B0/${V0}1/file | cut -d\  -f1)
+TEST [ "$LATEST_CTIME_MD5" == "$HEALED_MD5" ]
+
+############ Healing using favorite-child-policy = mtime #################
+TEST $CLI volume set $V0 cluster.favorite-child-policy none
+TEST $CLI volume set $V0 cluster.self-heal-daemon off
+TEST kill_brick $V0 $H0 $B0/${V0}1
+TEST dd if=/dev/urandom of=$M0/file bs=1024 count=1024
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 1
+TEST kill_brick $V0 $H0 $B0/${V0}0
+TEST dd if=/dev/urandom of=$M0/file bs=1024 count=1024
+
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 0
+TEST $CLI volume set $V0 cluster.self-heal-daemon on
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "Y" glustershd_up_status
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 1
+TEST $CLI volume heal $V0
+
+#file still in split-brain
+cat $M0/file > /dev/null
+EXPECT "1" echo $?
+
+#We know that the second brick has latest mtime.
+LATEST_CTIME_MD5=$(md5sum $B0/${V0}1/file | cut -d\  -f1)
+TEST $CLI volume set $V0 cluster.favorite-child-policy mtime
+TEST $CLI volume heal $V0
+EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
+cat $M0/file > /dev/null
+EXPECT "0" echo $?
+HEALED_MD5=$(md5sum $B0/${V0}0/file | cut -d\  -f1)
+TEST [ "$LATEST_CTIME_MD5" == "$HEALED_MD5" ]
+
+############ Healing using favorite-child-policy = size #################
+TEST $CLI volume set $V0 cluster.favorite-child-policy none
+TEST $CLI volume set $V0 cluster.self-heal-daemon off
+TEST kill_brick $V0 $H0 $B0/${V0}1
+TEST dd if=/dev/urandom of=$M0/file bs=1024 count=1024
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 1
+TEST kill_brick $V0 $H0 $B0/${V0}0
+TEST dd if=/dev/urandom of=$M0/file bs=1024 count=10240
+
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 0
+TEST $CLI volume set $V0 cluster.self-heal-daemon on
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "Y" glustershd_up_status
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 1
+TEST $CLI volume heal $V0
+
+#file fill in split-brain
+cat $M0/file > /dev/null
+EXPECT "1" echo $?
+
+#We know that the second brick has the bigger size file.
+BIGGER_FILE_MD5=$(md5sum $B0/${V0}1/file | cut -d\  -f1)
+TEST $CLI volume set $V0 cluster.favorite-child-policy size
+TEST $CLI volume heal $V0
+EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
+cat $M0/file > /dev/null
+EXPECT "0" echo $?
+HEALED_MD5=$(md5sum $B0/${V0}0/file | cut -d\  -f1)
+TEST [ "$BIGGER_FILE_MD5" == "$HEALED_MD5" ]
+
+############ Healing using favorite-child-policy = majority on replica-3  #################
+
+#Convert volume to replica-3
+TEST $CLI volume add-brick $V0 replica 3 $H0:$B0/${V0}2
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}2
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 2
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "Y" glustershd_up_status
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 1
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 2
+TEST $CLI volume heal $V0
+EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
+
+TEST $CLI volume set $V0 cluster.quorum-type none
+TEST $CLI volume set $V0 cluster.favorite-child-policy none
+TEST $CLI volume set $V0 cluster.self-heal-daemon off
+TEST kill_brick $V0 $H0 $B0/${V0}0
+TEST dd if=/dev/urandom of=$M0/file bs=1024 count=1024
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 0
+TEST kill_brick $V0 $H0 $B0/${V0}1
+TEST kill_brick $V0 $H0 $B0/${V0}2
+TEST dd if=/dev/urandom of=$M0/file bs=1024 count=10240
+
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}2
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 2
+TEST $CLI volume set $V0 cluster.self-heal-daemon on
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "Y" glustershd_up_status
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 1
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 2
+TEST $CLI volume heal $V0
+
+#file fill in split-brain
+cat $M0/file > /dev/null
+EXPECT "1" echo $?
+
+#We know that the second and third bricks agree with each other. Pick any one of them.
+MAJORITY_MD5=$(md5sum $B0/${V0}1/file | cut -d\  -f1)
+TEST $CLI volume set $V0 cluster.favorite-child-policy majority
+TEST $CLI volume heal $V0
+EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
+cat $M0/file > /dev/null
+EXPECT "0" echo $?
+HEALED_MD5=$(md5sum $B0/${V0}0/file | cut -d\  -f1)
+TEST [ "$MAJORITY_MD5" == "$HEALED_MD5" ]
+
+TEST force_umount $M0
+cleanup