DHT: Add xlator-option assert_no_child_down

If this is set, when CHILD_DOWN event is received, call exit

Signed-off-by: shishir gowda <shishirng@gluster.com>
Signed-off-by: Anand Avati <avati@gluster.com>

BUG: 2536 (gsync service introspection)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2536

3 files changed, 24 insertions, 0 deletions

diff --git a/xlators/cluster/dht/src/dht-common.c b/xlators/cluster/dht/src/dht-common.c
index c89b809b49f..5cf19d017a9 100644
--- a/xlators/cluster/dht/src/dht-common.c
+++ b/xlators/cluster/dht/src/dht-common.c
@@ -5164,6 +5164,12 @@ dht_notify (xlator_t *this, int event, void *data, ...)
         case GF_EVENT_CHILD_DOWN:
                 subvol = data;
 
+                if (conf->assert_no_child_down) {
+                        gf_log (this->name, GF_LOG_WARNING,
+                                "Received CHILD_DOWN. Exiting");
+                        exit(0);
+                }
+
                 for (i = 0; i < conf->subvolume_cnt; i++) {
                         if (subvol == conf->subvolumes[i]) {
                                 cnt = i;
diff --git a/xlators/cluster/dht/src/dht-common.h b/xlators/cluster/dht/src/dht-common.h
index 9c39d0d63b8..67cc16e4304 100644
--- a/xlators/cluster/dht/src/dht-common.h
+++ b/xlators/cluster/dht/src/dht-common.h
@@ -165,6 +165,7 @@ struct dht_conf {
                                        dht */
         gf_boolean_t   use_readdirp;
         char           vol_uuid[UUID_SIZE + 1];
+        gf_boolean_t   assert_no_child_down;
 };
 typedef struct dht_conf dht_conf_t;
 
diff --git a/xlators/cluster/dht/src/dht.c b/xlators/cluster/dht/src/dht.c
index c9b77d64428..ad83d8d4f03 100644
--- a/xlators/cluster/dht/src/dht.c
+++ b/xlators/cluster/dht/src/dht.c
@@ -419,6 +419,19 @@ init (xlator_t *this)
                 }
         }
 
+        conf->assert_no_child_down = 0;
+
+        if (!dict_get_str (this->options, "assert-no-child-down", &temp_str)) {
+                if (!strncmp (temp_str, "on", strlen (temp_str))) {
+                        conf->assert_no_child_down = 1;
+                        gf_log (this->name, GF_LOG_INFO,
+                                "assert-no-child-down set to on");
+                } else {
+                        conf->assert_no_child_down = 0;
+                        gf_log (this->name, GF_LOG_INFO,
+                                "assert-no-child-down set to off");
+                }
+        }
 
         ret = dht_init_subvolumes (this, conf);
         if (ret == -1) {
@@ -543,5 +556,9 @@ struct volume_options options[] = {
         { .key = {"use-readdirp"},
           .type = GF_OPTION_TYPE_BOOL
         },
+        { .key = {"assert-no-child-down"},
+          .value = {"on", "off"},
+          .type = GF_OPTION_TYPE_STR
+        },
         { .key  = {NULL} },
 };