cluster/afr : enable inspection & resolution of files in split-brain

Part 2/2 patch to enable users analyze and resolve
split-brain.

This patch enables :
1) Users to inspect the files in data and metadata split-brain.
2) Resolve the split-brain.
Both using a series of setfattr commands.

Consider a volume "test" with 2 bricks.

1) To inspect a file f1:
setfattr -n replica.split-brain-choice -v test-client-0 f1
        After the execution of this command, if no read_subvol
is found, reads will be served from test-client-0 (corresponding
to brick-0).

2) To resolve split-brain :
setfattr -n replica.split-brain-heal-finalize -v test-client-0 f1
        Execution of this command will lead to the resolution
of data and metadata split-brain with subvol mentioned in the
command (test-client-0 here) as the source and the rest as sink.

Change-Id: Ia20f3ee5abd3119e3d54fcc599f1e55ac65fd179
BUG: 1191396
Signed-off-by: Anuradha <atalur@redhat.com>
Reviewed-on: http://review.gluster.org/9743
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/tests/basic/afr/split-brain-resolution.t b/tests/basic/afr/split-brain-resolution.t
new file mode 100644
index 00000000000..feb527a71b3
--- /dev/null
+++ b/tests/basic/afr/split-brain-resolution.t
@@ -0,0 +1,86 @@
+#!/bin/bash
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+cleanup;
+
+function get_split_brain_status {
+        local path=$1
+        echo `getfattr -n replica.split-brain-status $path` | cut -f2 -d"=" | sed -e 's/^"//'  -e 's/"$//'
+}
+
+TEST glusterd
+TEST pidof glusterd
+TEST $CLI volume create $V0 replica 2 $H0:$B0/${V0}{0,1}
+TEST $CLI volume start $V0
+
+#Disable self-heal-daemon
+TEST $CLI volume set $V0 cluster.self-heal-daemon off
+
+TEST glusterfs --volfile-id=$V0 --volfile-server=$H0 --entry-timeout=0 $M0;
+
+TEST `echo "some-data" > $M0/data-split-brain.txt`
+TEST `echo "some-data" > $M0/metadata-split-brain.txt`
+
+#Create data and metadata split-brain
+TEST kill_brick $V0 $H0 $B0/${V0}0
+
+TEST `echo "brick1_alive" > $M0/data-split-brain.txt`
+TEST setfattr -n user.test -v brick1 $M0/metadata-split-brain.txt
+
+TEST $CLI volume start $V0 force
+TEST kill_brick $V0 $H0 $B0/${V0}1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 0
+
+TEST `echo "brick0_alive" > $M0/data-split-brain.txt`
+TEST setfattr -n user.test -v brick0 $M0/metadata-split-brain.txt
+
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 1
+
+EXPECT 4 afr_get_pending_heal_count $V0
+
+TEST ! cat $M0/data-split-brain.txt
+TEST ! getxattr -n user.test $M0/metadata-split-brain.txt
+
+#Inspect file in data-split-brain
+EXPECT "data-split-brain:yes metadata-split-brain:no Choices:patchy-client-0,patchy-client-1" get_split_brain_status $M0/data-split-brain.txt
+TEST setfattr -n replica.split-brain-choice -v $V0-client-0 $M0/data-split-brain.txt
+
+#Should now be able to read the contents of data-split-brain.txt
+EXPECT "brick0_alive" cat $M0/data-split-brain.txt
+
+TEST setfattr -n replica.split-brain-choice -v $V0-client-1 $M0/data-split-brain.txt
+
+#Should now be able to read the contents of data-split-brain.txt
+EXPECT "brick1_alive" cat $M0/data-split-brain.txt
+
+#Inspect the file in metadata-split-brain
+EXPECT "data-split-brain:no metadata-split-brain:yes Choices:patchy-client-0,patchy-client-1" get_split_brain_status $M0/metadata-split-brain.txt
+TEST setfattr -n replica.split-brain-choice -v $V0-client-0 $M0/metadata-split-brain.txt
+
+EXPECT "brick0" get_text_xattr user.test $M0/metadata-split-brain.txt
+
+TEST setfattr -n replica.split-brain-choice -v $V0-client-1 $M0/metadata-split-brain.txt
+EXPECT "brick1" get_text_xattr user.test $M0/metadata-split-brain.txt
+
+#Check that setting split-brain-choice to "none" results in EIO again
+TEST setfattr -n replica.split-brain-choice -v none $M0/metadata-split-brain.txt
+TEST setfattr -n replica.split-brain-choice -v none $M0/data-split-brain.txt
+TEST ! getxattr -n user.test $M0/metadata-split-brain.txt
+TEST ! cat $M0/data-split-brain.txt
+
+#Negative test cases should fail
+TEST ! setfattr -n replica.split-brain-choice -v $V0-client-4 $M0/data-split-brain.txt
+TEST ! setfattr -n replica.split-brain-heal-finalize -v $V0-client-4 $M0/metadata-split-brain.txt
+
+#Heal the files
+TEST setfattr -n replica.split-brain-heal-finalize -v $V0-client-0 $M0/metadata-split-brain.txt
+TEST setfattr -n replica.split-brain-heal-finalize -v $V0-client-1 $M0/data-split-brain.txt
+
+EXPECT "brick0" get_text_xattr user.test $M0/metadata-split-brain.txt
+EXPECT "brick1_alive" cat $M0/data-split-brain.txt
+
+EXPECT 0 afr_get_pending_heal_count $V0
+
+cleanup;