tier : Tier as a service

tierd is implemented by separating from rebalance process.

The commands affected:

1) Attach tier will trigger this process instead of old one
2) tier start and tier start force will also trigger this process.
3) volume status [tier] will show tier daemon as a process instead
of task and normal tier status and tier detach status works.
4) tier stop implemented.
5) detach tier implemented separately along with new detach tier
status
6) volume tier volname status will work using the changes.
7) volume set works

This patch has separated the tier translator from the legacy
DHT rebalance code. It now sends the RPCs from the CLI
to glusterd separate to the DHT rebalance code.
The daemon is now a service, similar to the snapshot daemon,
and can be viewed using the volume status command.

The code for the validation and commit phase are the same
as the earlier tier validation code in DHT rebalance.

The “brickop” phase has been changed so that the status
command can use this framework.

The service management framework is now used.
DHT rebalance does not use this framework.

This service framework takes care of :

*) spawning the daemon, killing it and other such processes.
*) volume set options , which are written on the volfile.
*) restart and reconfigure functions. Restart is to restart
the daemon at two points
        1)after gluster goes down and comes up.
        2) to stop detach tier.
*) reconfigure is used to make immediate volfile changes.
By doing this, we don’t restart the daemon.
it has the code to rewrite the volfile for topological
changes too (which comes into place during add and remove brick).

With this patch the log, pid, and volfile are separated
and put into respective directories.

Change-Id: I3681d0d66894714b55aa02ca2a30ac000362a399
BUG: 1313838
Signed-off-by: hari gowtham <hgowtham@redhat.com>
Reviewed-on: http://review.gluster.org/13365
Smoke: Gluster Build System <jenkins@build.gluster.org>
Tested-by: hari gowtham <hari.gowtham005@gmail.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Dan Lambright <dlambrig@redhat.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>

1 files changed, 18 insertions, 1 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.h b/xlators/mgmt/glusterd/src/glusterd-utils.h
index 53f4d971998..5f490534ef5 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.h
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.h
@@ -268,6 +268,13 @@ glusterd_brick_stop (glusterd_volinfo_t *volinfo,
 gf_boolean_t
 glusterd_is_tier_daemon_running (glusterd_volinfo_t *volinfo);
 
+int32_t
+glusterd_add_tierd_to_dict (glusterd_volinfo_t *volinfo,
+                            dict_t  *dict, int32_t count);
+
+int
+glusterd_op_tier_status (dict_t *dict, char **op_errstr, dict_t *rsp_dict,
+                glusterd_op_t op);
 
 int
 glusterd_is_defrag_on (glusterd_volinfo_t *volinfo);
@@ -445,7 +452,7 @@ glusterd_validate_volume_id (dict_t *op_dict, glusterd_volinfo_t *volinfo);
 
 int
 glusterd_defrag_volume_status_update (glusterd_volinfo_t *volinfo,
-                                      dict_t *rsp_dict);
+                                      dict_t *rsp_dict, int32_t cmd);
 
 int
 glusterd_check_files_identical (char *filename1, char *filename2,
@@ -474,6 +481,8 @@ glusterd_volume_status_copy_to_op_ctx_dict (dict_t *aggr, dict_t *rsp_dict);
 int
 glusterd_volume_rebalance_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict);
 int
+glusterd_volume_tier_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict);
+int
 glusterd_volume_heal_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict);
 int
 glusterd_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict);
@@ -540,6 +549,11 @@ gf_boolean_t
 gd_is_remove_brick_committed (glusterd_volinfo_t *volinfo);
 
 int
+glusterd_remove_brick_validate_bricks (gf1_op_commands cmd, int32_t brick_count,
+                                       dict_t *dict,
+                                       glusterd_volinfo_t *volinfo,
+                                       char **errstr);
+int
 glusterd_get_slave_details_confpath (glusterd_volinfo_t *volinfo,
                                      dict_t *dict, char **slave_url,
                                      char **slave_host, char **slave_vol,
@@ -579,6 +593,9 @@ gf_boolean_t
 gd_should_i_start_rebalance  (glusterd_volinfo_t *volinfo);
 
 int
+glusterd_is_tierd_enabled (glusterd_volinfo_t *volinfo);
+
+int
 glusterd_is_volume_quota_enabled (glusterd_volinfo_t *volinfo);
 
 int