cluster/ec: Handle CHILD UP/DOWN in all cases

Problem:
When all the bricks are down at the time of mounting the volume, then mount
command hangs.

Fix:
1. Ignore all CHILD_CONNECTING events comming from subvolumes.
2. On timer expiration (without enough up or down childs) send
   CHILD_DOWN.
3. Once enough up or down subvolumes are detected, send the appropriate event.
   When rest of the subvols go up/down without changing the overall
   ec-up/ec-down send CHILD_MODIFIED to parent subvols.

Change-Id: Ie0194dbadef2dce36ab5eb7beece84a6bf3c631c
BUG: 1179180
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/9396
Reviewed-by: Xavier Hernandez <xhernandez@datalab.es>
Tested-by: Gluster Build System <jenkins@build.gluster.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/tests/basic/ec/ec-notify.t b/tests/basic/ec/ec-notify.t
new file mode 100644
index 00000000000..586be91bdbe
--- /dev/null
+++ b/tests/basic/ec/ec-notify.t
@@ -0,0 +1,79 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+
+# This test checks notify part of ec
+
+cleanup
+TEST glusterd
+TEST pidof glusterd
+TEST $CLI volume create $V0 disperse 3 redundancy 1 $H0:$B0/${V0}{0..2}
+TEST $CLI volume start $V0
+
+#First time mount tests.
+# When all the bricks are up, mount should succeed and up-children
+# count should be 3
+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0;
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "3" ec_child_up_count $V0 0
+TEST stat $M0
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0
+
+# When the volume is stopped mount succeeds and up-children will be 0
+TEST $CLI volume stop $V0
+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0;
+# Wait for 5 seconds even after that up_count should show 0
+sleep 5;
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "0" ec_child_up_count $V0 0
+TEST ! stat $M0
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0
+
+# When 2 bricks are up, mount should succeed and up-children
+# count should be 2
+
+TEST $CLI volume start $V0
+TEST kill_brick $V0 $H0 $B0/${V0}2
+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0;
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "2" ec_child_up_count $V0 0
+TEST stat $M0
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0
+
+# When only 1 brick is up mount should fail.
+TEST kill_brick $V0 $H0 $B0/${V0}1
+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0;
+# Wait for 5 seconds even after that up_count should show 1
+sleep 5
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" ec_child_up_count $V0 0
+TEST ! stat $M0
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0
+
+# Mount already succeeded. Test that the brick up down are leading to correct
+# state changes in ec.
+TEST $CLI volume stop $V0
+TEST $CLI volume start $V0 force
+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0;
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "3" ec_child_up_count $V0 0
+TEST touch $M0/a
+
+# kill 1 brick and the up_count should become 2, fops should still succeed
+TEST kill_brick $V0 $H0 $B0/${V0}1
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "2" ec_child_up_count $V0 0
+TEST touch $M0/b
+
+# kill one more brick and the up_count should become 1, fops should fail
+TEST kill_brick $V0 $H0 $B0/${V0}2
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" ec_child_up_count $V0 0
+TEST ! touch $M0/c
+
+# kill one more brick and the up_count should become 0, fops should still fail
+TEST kill_brick $V0 $H0 $B0/${V0}0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "0" ec_child_up_count $V0 0
+TEST ! touch $M0/c
+
+# Bring up all the bricks up and see that up_count is 3 and fops are succeeding
+# again.
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "3" ec_child_up_count $V0 0
+TEST touch $M0/c
+
+cleanup