glusterd: compare uuid instead of hostname address resolution

Backport of http://review.gluster.org/14849

In glusterd_get_brickinfo () brick's hostname is address resolved. This adds an
unnecessary latency since it uses calls like getaddrinfo (). Instead given the
local brick's uuid is already known a comparison of MY_UUID and brickinfo->uuid
is much more light weight than the previous approach.

On a scale testing where cluster hosting ~400 volumes spanning across 4 nodes,
if a node goes for a reboot, few of the bricks don't come up. After few days of
analysis its found that glusterd_pmap_sigin () was taking signficant amount of
latency and further code walthrough revealed this unnecessary address
resolution. Applying this fix solves the issue and now all the brick processes
come up on a node reboot.

Backport of commit 633e6fe265bc2de42dade58dc6a15c285957da76:
> Change-Id: I299b8660ce0da6f3f739354f5c637bc356d82133
> BUG: 1352279
> Signed-off-by: Atin Mukherjee <amukherj@redhat.com>
> Reviewed-on: http://review.gluster.org/14849
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Prashanth Pai <ppai@redhat.com>
> Reviewed-by: Samikshan Bairagya <samikshan@gmail.com>
> Reviewed-by: Kaushal M <kaushal@redhat.com>

Change-Id: I299b8660ce0da6f3f739354f5c637bc356d82133
BUG: 1352817
Signed-off-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-on: http://review.gluster.org/14860
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Smoke: Gluster Build System <jenkins@build.gluster.org>

3 files changed, 6 insertions, 9 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-pmap.c b/xlators/mgmt/glusterd/src/glusterd-pmap.c
index cbc800595ab..192a1d95258 100644
--- a/xlators/mgmt/glusterd/src/glusterd-pmap.c
+++ b/xlators/mgmt/glusterd/src/glusterd-pmap.c
@@ -416,8 +416,7 @@ __gluster_pmap_signin (rpcsvc_request_t *req)
         rsp.op_ret = pmap_registry_bind (THIS, args.port, args.brick,
                                          GF_PMAP_PORT_BRICKSERVER, req->trans);
 
-        ret = glusterd_get_brickinfo (THIS, args.brick, args.port, _gf_true,
-                                      &brickinfo);
+        ret = glusterd_get_brickinfo (THIS, args.brick, args.port, &brickinfo);
 fail:
         glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
                                (xdrproc_t)xdr_pmap_signin_rsp);
@@ -457,8 +456,7 @@ __gluster_pmap_signout (rpcsvc_request_t *req)
         rsp.op_ret = pmap_registry_remove (THIS, args.port, args.brick,
                                            GF_PMAP_PORT_BRICKSERVER, req->trans);
 
-        ret = glusterd_get_brickinfo (THIS, args.brick, args.port, _gf_true,
-                                      &brickinfo);
+        ret = glusterd_get_brickinfo (THIS, args.brick, args.port, &brickinfo);
         if (args.rdma_port) {
                 snprintf(brick_path, PATH_MAX, "%s.rdma", args.brick);
                 rsp.op_ret = pmap_registry_remove (THIS, args.rdma_port,
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index 682a403a45f..d85c8947802 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -5163,7 +5163,7 @@ glusterd_get_dist_leaf_count (glusterd_volinfo_t *volinfo)
 
 int
 glusterd_get_brickinfo (xlator_t *this, const char *brickname, int port,
-                        gf_boolean_t localhost, glusterd_brickinfo_t **brickinfo)
+                        glusterd_brickinfo_t **brickinfo)
 {
         glusterd_conf_t         *priv = NULL;
         glusterd_volinfo_t      *volinfo = NULL;
@@ -5177,7 +5177,7 @@ glusterd_get_brickinfo (xlator_t *this, const char *brickname, int port,
         cds_list_for_each_entry (volinfo, &priv->volumes, vol_list) {
                 cds_list_for_each_entry (tmpbrkinfo, &volinfo->bricks,
                                          brick_list) {
-                        if (localhost && !gf_is_local_addr (tmpbrkinfo->hostname))
+                        if (gf_uuid_compare (tmpbrkinfo->uuid, MY_UUID))
                                 continue;
                         if (!strcmp(tmpbrkinfo->path, brickname) &&
                             (tmpbrkinfo->port == port)) {
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.h b/xlators/mgmt/glusterd/src/glusterd-utils.h
index 5f4bb6d251b..66db618a08d 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.h
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.h
@@ -206,12 +206,11 @@ glusterd_add_volume_to_dict (glusterd_volinfo_t *volinfo,
                              char *prefix);
 int
 glusterd_get_brickinfo (xlator_t *this, const char *brickname,
-                        int port, gf_boolean_t localhost,
-                        glusterd_brickinfo_t **brickinfo);
+                        int port, glusterd_brickinfo_t **brickinfo);
 
 void
 glusterd_set_brick_status (glusterd_brickinfo_t  *brickinfo,
-                            gf_brick_status_t status);
+                           gf_brick_status_t status);
 
 gf_boolean_t
 glusterd_is_brick_started (glusterd_brickinfo_t  *brickinfo);