core: run many bricks within one glusterfsd process

This patch adds support for multiple brick translator stacks running
in a single brick server process.  This reduces our per-brick memory usage by
approximately 3x, and our appetite for TCP ports even more.  It also creates
potential to avoid process/thread thrashing, and to improve QoS by scheduling
more carefully across the bricks, but realizing that potential will require
further work.

Multiplexing is controlled by the "cluster.brick-multiplex" global option.  By
default it's off, and bricks are started in separate processes as before.  If
multiplexing is enabled, then *compatible* bricks (mostly those with the same
transport options) will be started in the same process.

Change-Id: I45059454e51d6f4cbb29a4953359c09a408695cb
BUG: 1385758
Signed-off-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-on: https://review.gluster.org/14763
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: Vijay Bellur <vbellur@redhat.com>

1 files changed, 0 insertions, 27 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-replace-brick.c b/xlators/mgmt/glusterd/src/glusterd-replace-brick.c
index eb1a714bfd5..fb29c6efcfd 100644
--- a/xlators/mgmt/glusterd/src/glusterd-replace-brick.c
+++ b/xlators/mgmt/glusterd/src/glusterd-replace-brick.c
@@ -326,22 +326,6 @@ out:
         return ret;
 }
 
-static int
-rb_kill_destination_brick (glusterd_volinfo_t *volinfo,
-                           glusterd_brickinfo_t *dst_brickinfo)
-{
-        glusterd_conf_t  *priv               = NULL;
-        char              pidfile[PATH_MAX]  = {0,};
-
-        priv = THIS->private;
-
-        snprintf (pidfile, PATH_MAX, "%s/vols/%s/%s",
-                  priv->workdir, volinfo->volname,
-                  RB_DSTBRICK_PIDFILE);
-
-        return glusterd_service_stop ("brick", pidfile, SIGTERM, _gf_true);
-}
-
 
 int
 glusterd_op_perform_replace_brick (glusterd_volinfo_t  *volinfo,
@@ -526,17 +510,6 @@ glusterd_op_replace_brick (dict_t *dict, dict_t *rsp_dict)
                 goto out;
         }
 
-        if (gf_is_local_addr (dst_brickinfo->hostname)) {
-                gf_msg_debug (this->name, 0, "I AM THE DESTINATION HOST");
-                ret = rb_kill_destination_brick (volinfo, dst_brickinfo);
-                if (ret) {
-                        gf_msg (this->name, GF_LOG_CRITICAL, 0,
-                                GD_MSG_BRK_CLEANUP_FAIL,
-                                "Unable to cleanup dst brick");
-                        goto out;
-                }
-        }
-
         ret = glusterd_svcs_stop (volinfo);
         if (ret) {
                 gf_msg (this->name, GF_LOG_ERROR, 0,