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authorRaghavendra Bhat <raghavendra@redhat.com>2015-05-13 14:35:47 +0530
committerVenky Shankar <vshankar@redhat.com>2015-05-30 21:15:04 -0700
commit2ef27f82c3705b18e2c3c030b8debcdb7b30e33b (patch)
tree49240fbcaeb66243a8a2669699a4b026d55c15af /xlators/features/bit-rot
parent85173e43faba9bbedd287a4103c129e289829e1f (diff)
features/bitrot: refactor brick connection logic
Backport of http://review.gluster.org/10763 Brick connection was bloated (and not implemented efficiently) with calls which were not required to be called under lock. This resulted in starvation of lock by critical code paths. This eventally did not scale when the number of bricks per volume increases (add-brick and the likes). Also, this patch cleans up some of the weird reconnection logic that added more to the starvation of resources and cleans up uncontrolled growing of log files. Change-Id: I05e737f2a9742944a4a543327d167de2489236a4 BUG: 1226146 Original-Author: Raghavendra Bhat <raghavendra@redhat.com> Signed-off-by: Venky Shankar <vshankar@redhat.com> Reviewed-on: http://review.gluster.org/10986 Tested-by: Gluster Build System <jenkins@build.gluster.com> Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Diffstat (limited to 'xlators/features/bit-rot')
-rw-r--r--xlators/features/bit-rot/src/bitd/bit-rot.c124
-rw-r--r--xlators/features/bit-rot/src/bitd/bit-rot.h7
2 files changed, 68 insertions, 63 deletions
diff --git a/xlators/features/bit-rot/src/bitd/bit-rot.c b/xlators/features/bit-rot/src/bitd/bit-rot.c
index e7cfe89..8149083 100644
--- a/xlators/features/bit-rot/src/bitd/bit-rot.c
+++ b/xlators/features/bit-rot/src/bitd/bit-rot.c
@@ -1080,8 +1080,11 @@ static inline int32_t
br_enact_signer (xlator_t *this, br_child_t *child, br_stub_init_t *stub)
{
int32_t ret = 0;
+ br_private_t *priv = NULL;
struct gf_brick_spec *brick = NULL;
+ priv = this->private;
+
brick = GF_CALLOC (1, sizeof (struct gf_brick_spec),
gf_common_mt_gf_brick_spec_t);
if (!brick)
@@ -1105,7 +1108,7 @@ br_enact_signer (xlator_t *this, br_child_t *child, br_stub_init_t *stub)
child->threadrunning = 1;
/* it's OK to continue, "old" objects would be signed when modified */
- list_del_init (&child->list);
+ list_add_tail (&child->list, &priv->signing);
return 0;
dealloc:
@@ -1157,7 +1160,7 @@ br_enact_scrubber (xlator_t *this, br_child_t *child)
*/
pthread_mutex_lock (&fsscrub->mutex);
{
- list_move (&child->list, &fsscrub->scrublist);
+ list_add_tail (&child->list, &fsscrub->scrublist);
pthread_cond_broadcast (&fsscrub->cond);
}
pthread_mutex_unlock (&fsscrub->mutex);
@@ -1165,6 +1168,10 @@ br_enact_scrubber (xlator_t *this, br_child_t *child)
return 0;
error_return:
+ LOCK_DESTROY (&fsscan->entrylock);
+ pthread_mutex_destroy (&fsscan->waitlock);
+ pthread_cond_destroy (&fsscan->waitcond);
+
return -1;
}
@@ -1233,6 +1240,10 @@ br_brick_connect (xlator_t *this, br_child_t *child)
else
ret = br_enact_signer (this, child, stub);
+ if (!ret)
+ gf_log (this->name, GF_LOG_INFO,
+ "Connected to brick %s..", child->brick_path);
+
free_dict:
dict_unref (xattr);
wipeloc:
@@ -1249,10 +1260,10 @@ br_brick_connect (xlator_t *this, br_child_t *child)
void *
br_handle_events (void *arg)
{
+ int32_t ret = 0;
xlator_t *this = NULL;
br_private_t *priv = NULL;
br_child_t *child = NULL;
- int32_t ret = -1;
this = arg;
priv = this->private;
@@ -1268,25 +1279,19 @@ br_handle_events (void *arg)
while (1) {
pthread_mutex_lock (&priv->lock);
{
- while (list_empty (&priv->bricks)) {
- pthread_cond_wait (&priv->cond,
- &priv->lock);
- }
-
- child = list_entry (priv->bricks.next, br_child_t,
- list);
- if (child && child->child_up) {
- ret = br_brick_connect (this, child);
- if (ret == -1)
- gf_log (this->name, GF_LOG_ERROR,
- "failed to connect to the "
- "child (subvolume: %s)",
- child->xl->name);
-
- }
+ while (list_empty (&priv->bricks))
+ pthread_cond_wait (&priv->cond, &priv->lock);
+ child = list_first_entry
+ (&priv->bricks, br_child_t, list);
+ list_del_init (&child->list);
}
pthread_mutex_unlock (&priv->lock);
+
+ ret = br_brick_connect (this, child);
+ if (ret)
+ gf_log (this->name, GF_LOG_ERROR, "failed to connect "
+ "to subvolume %s", child->xl->name);
}
return NULL;
@@ -1295,7 +1300,7 @@ br_handle_events (void *arg)
int32_t
mem_acct_init (xlator_t *this)
{
- int32_t ret = -1;
+ int32_t ret = -1;
if (!this)
return ret;
@@ -1314,60 +1319,52 @@ mem_acct_init (xlator_t *this)
int
notify (xlator_t *this, int32_t event, void *data, ...)
{
- xlator_t *subvol = NULL;
- br_private_t *priv = NULL;
- int idx = -1;
- br_child_t *child = NULL;
+ int idx = -1;
+ xlator_t *subvol = NULL;
+ br_child_t *child = NULL;
+ br_private_t *priv = NULL;
subvol = (xlator_t *)data;
priv = this->private;
- gf_log (this->name, GF_LOG_TRACE, "Notification received: %d",
- event);
+ gf_log (this->name, GF_LOG_TRACE, "Notification received: %d", event);
+
+ idx = br_find_child_index (this, subvol);
switch (event) {
case GF_EVENT_CHILD_UP:
- /* should this be done under lock? or is it ok to do it
- without lock? */
- idx = br_find_child_index (this, subvol);
+ if (idx < 0) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "Got event %d from invalid subvolume", event);
+ goto out;
+ }
pthread_mutex_lock (&priv->lock);
{
- if (idx < 0) {
- gf_log (this->name, GF_LOG_ERROR, "got child "
- "up from invalid subvolume");
- } else {
- child = &priv->children[idx];
- if (child->child_up != 1)
- child->child_up = 1;
- if (!child->xl)
- child->xl = subvol;
- if (!child->table)
- child->table = inode_table_new (4096,
- subvol);
- priv->up_children++;
- list_add_tail (&child->list, &priv->bricks);
- pthread_cond_signal (&priv->cond);
- }
+ child = &priv->children[idx];
+ if (child->child_up == 1)
+ goto unblock;
+
+ child->child_up = 1;
+ child->xl = subvol;
+ child->table = inode_table_new (4096, subvol);
+
+ priv->up_children++;
+
+ list_add_tail (&child->list, &priv->bricks);
+ pthread_cond_signal (&priv->cond);
}
+ unblock:
pthread_mutex_unlock (&priv->lock);
- break;
- case GF_EVENT_CHILD_MODIFIED:
- idx = br_find_child_index (this, subvol);
- if (idx < 0) {
- gf_log (this->name, GF_LOG_ERROR, "received child up "
- "from invalid subvolume");
- goto out;
- }
- priv = this->private;
- /* ++(priv->generation); */
+ if (priv->up_children == priv->child_count)
+ default_notify (this, event, data);
break;
+
case GF_EVENT_CHILD_DOWN:
- idx = br_find_child_index (this, subvol);
if (idx < 0) {
- gf_log (this->name, GF_LOG_ERROR, "received child down "
- "from invalid subvolume");
+ gf_log (this->name, GF_LOG_ERROR,
+ "Got event %d from invalid subvolume", event);
goto out;
}
@@ -1379,13 +1376,15 @@ notify (xlator_t *this, int32_t event, void *data, ...)
}
}
pthread_mutex_unlock (&priv->lock);
+
+ if (priv->up_children == 0)
+ default_notify (this, event, data);
break;
- case GF_EVENT_PARENT_UP:
- default_notify (this, GF_EVENT_PARENT_UP, data);
- break;
+ default:
+ default_notify (this, event, data);
}
-out:
+ out:
return 0;
}
@@ -1569,6 +1568,7 @@ init (xlator_t *this)
for (i = 0; i < priv->child_count; i++)
INIT_LIST_HEAD (&priv->children[i].list);
INIT_LIST_HEAD (&priv->bricks);
+ INIT_LIST_HEAD (&priv->signing);
priv->timer_wheel = glusterfs_global_timer_wheel (this);
if (!priv->timer_wheel) {
diff --git a/xlators/features/bit-rot/src/bitd/bit-rot.h b/xlators/features/bit-rot/src/bitd/bit-rot.h
index ec943e9..40e02eb 100644
--- a/xlators/features/bit-rot/src/bitd/bit-rot.h
+++ b/xlators/features/bit-rot/src/bitd/bit-rot.h
@@ -143,13 +143,17 @@ struct br_private {
struct list_head bricks; /* list of bricks from which CHILD_UP
has been received */
- pthread_cond_t cond; /* handling CHILD_UP notifications */
+ struct list_head signing;
+
pthread_cond_t object_cond; /* handling signing of objects */
int child_count;
br_child_t *children; /* list of subvolumes */
int up_children;
+
+ pthread_cond_t cond; /* handling CHILD_UP notifications */
pthread_t thread; /* thread for connecting each UP
child with changelog */
+
struct tvec_base *timer_wheel; /* timer wheel where the objects which
changelog has sent sits and waits
for expiry */
@@ -163,6 +167,7 @@ struct br_private {
br_tbf_t *tbf; /* token bucket filter */
gf_boolean_t iamscrubber; /* function as a fs scrubber */
+
struct br_scrubber fsscrub; /* scrubbers for this subvolume */
};