glusterd: socketfile & pidfile related fixes for brick multiplexing feature

Problem: While brick-muliplexing is on after restarting glusterd, CLI is
         not showing pid of all brick processes in all volumes.

Solution: While brick-mux is on all local brick process communicated through one
          UNIX socket but as per current code (glusterd_brick_start) it is trying
          to communicate with separate UNIX socket for each volume which is populated
          based on brick-name and vol-name.Because of multiplexing design only one
          UNIX socket is opened so it is throwing poller error and not able to
          fetch correct status of brick process through cli process.
          To resolve the problem write a new function glusterd_set_socket_filepath_for_mux
          that will call by glusterd_brick_start to validate about the existence of socketpath.
          To avoid the continuous EPOLLERR erros in  logs update socket_connect code.

Test:     To reproduce the issue followed below steps
          1) Create two distributed volumes(dist1 and dist2)
          2) Set cluster.brick-multiplex is on
          3) kill glusterd
          4) run command gluster v status
          After apply the patch it shows correct pid for all volumes

BUG: 1444596
Change-Id: I5d10af69dea0d0ca19511f43870f34295a54a4d2
Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
Reviewed-on: https://review.gluster.org/17101
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Prashanth Pai <ppai@redhat.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>

3 files changed, 116 insertions, 0 deletions

diff --git a/tests/bugs/glusterd/bug-1444596_brick_mux_gd_status_restart.t b/tests/bugs/glusterd/bug-1444596_brick_mux_gd_status_restart.t
new file mode 100644
index 00000000000..950cb5f8046
--- /dev/null
+++ b/tests/bugs/glusterd/bug-1444596_brick_mux_gd_status_restart.t
@@ -0,0 +1,68 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+. $(dirname $0)/../../cluster.rc
+
+
+function count_up_bricks {
+        $CLI --xml volume status $1 | grep '<status>1' | wc -l
+}
+
+function count_brick_processes {
+        pgrep glusterfsd | wc -l
+}
+
+cleanup
+TEST glusterd
+TEST $CLI volume create $V0 $H0:$B0/brick{0,1}
+TEST $CLI volume create $V1 $H0:$B0/brick{2,3}
+
+TEST $CLI volume set all cluster.brick-multiplex on
+
+TEST $CLI volume start $V0
+TEST $CLI volume start $V1
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 2 count_up_bricks $V0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 2 count_up_bricks $V1
+EXPECT 1 count_brick_processes
+
+pkill glusterd
+TEST glusterd
+
+#Check brick status after restart glusterd
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 2 count_up_bricks $V0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 2 count_up_bricks $V1
+
+
+TEST $CLI volume stop $V0
+TEST $CLI volume stop $V1
+
+cleanup
+
+TEST glusterd
+TEST $CLI volume create $V0 $H0:$B0/brick{0,1}
+TEST $CLI volume create $V1 $H0:$B0/brick{2,3}
+
+TEST $CLI volume set all cluster.brick-multiplex on
+
+TEST $CLI volume start $V0
+TEST $CLI volume start $V1
+
+EXPECT 1 count_brick_processes
+
+TEST $CLI volume set $V0 performance.cache-size 32MB
+TEST $CLI volume stop $V0
+TEST $CLI volume start $V0
+
+#Check No. of brick processes after change option
+EXPECT 2 count_brick_processes
+
+pkill glusterd
+TEST glusterd
+
+#Check brick status after restart glusterd should not be NA
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 2 count_up_bricks $V0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 2 count_up_bricks $V1
+EXPECT 2 count_brick_processes
+
+cleanup
diff --git a/tests/bugs/glusterd/bug-1444596_brick_mux_posix_hlth_chk_status.t b/tests/bugs/glusterd/bug-1444596_brick_mux_posix_hlth_chk_status.t
new file mode 100644
index 00000000000..39ab2dd723c
--- /dev/null
+++ b/tests/bugs/glusterd/bug-1444596_brick_mux_posix_hlth_chk_status.t
@@ -0,0 +1,44 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+. $(dirname $0)/../../cluster.rc
+
+
+function count_up_bricks {
+        $CLI --xml volume status $1 | grep '<status>1' | wc -l
+}
+
+function count_brick_processes {
+        pgrep glusterfsd | wc -l
+}
+
+cleanup
+TEST glusterd -LDEBUG
+TEST $CLI volume create $V0 $H0:$B0/brick{0,1}
+TEST $CLI volume create $V1 $H0:$B0/brick{2,3}
+
+TEST $CLI volume set all cluster.brick-multiplex on
+
+TEST $CLI volume start $V0
+TEST $CLI volume start $V1
+
+EXPECT 1 count_brick_processes
+
+TEST $CLI volume stop $V0
+TEST $CLI volume delete $V0
+TEST rm -rf $H0:$B0/brick{0,1}
+
+#Check No. of brick processes after remove brick from back-end
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 2 count_up_bricks $V1
+
+EXPECT 1 count_brick_processes
+
+pkill glusterd
+TEST glusterd -LDEBUG
+sleep 5
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 2 count_up_bricks $V1
+
+
+cleanup
+
diff --git a/tests/bugs/glusterd/bug-913555.t b/tests/bugs/glusterd/bug-913555.t
index 5c845dc8545..9bc875340d1 100755
--- a/tests/bugs/glusterd/bug-913555.t
+++ b/tests/bugs/glusterd/bug-913555.t
@@ -16,6 +16,10 @@ function check_peers {
 	$CLI_1 peer status | grep 'Peer in Cluster (Connected)' | wc -l
 }
 
+function online_brick_count {
+       $CLI_1 --xml volume status | grep '<status>1' | wc -l
+}
+
 cleanup;
 
 TEST launch_cluster 3; # start 3-node virtual cluster