mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-17 17:53:56 +08:00
libceph: for chooseleaf rules, retry CRUSH map descent from root if leaf is failed
Add libceph support for a new CRUSH tunable recently added to Ceph servers. Consider the CRUSH rule step chooseleaf firstn 0 type <node_type> This rule means that <n> replicas will be chosen in a manner such that each chosen leaf's branch will contain a unique instance of <node_type>. When an object is re-replicated after a leaf failure, if the CRUSH map uses a chooseleaf rule the remapped replica ends up under the <node_type> bucket that held the failed leaf. This causes uneven data distribution across the storage cluster, to the point that when all the leaves but one fail under a particular <node_type> bucket, that remaining leaf holds all the data from its failed peers. This behavior also limits the number of peers that can participate in the re-replication of the data held by the failed leaf, which increases the time required to re-replicate after a failure. For a chooseleaf CRUSH rule, the tree descent has two steps: call them the inner and outer descents. If the tree descent down to <node_type> is the outer descent, and the descent from <node_type> down to a leaf is the inner descent, the issue is that a down leaf is detected on the inner descent, so only the inner descent is retried. In order to disperse re-replicated data as widely as possible across a storage cluster after a failure, we want to retry the outer descent. So, fix up crush_choose() to allow the inner descent to return immediately on choosing a failed leaf. Wire this up as a new CRUSH tunable. Note that after this change, for a chooseleaf rule, if the primary OSD in a placement group has failed, choosing a replacement may result in one of the other OSDs in the PG colliding with the new primary. This requires that OSD's data for that PG to need moving as well. This seems unavoidable but should be relatively rare. This corresponds to ceph.git commit 88f218181a9e6d2292e2697fc93797d0f6d6e5dc. Signed-off-by: Jim Schutt <jaschut@sandia.gov> Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
parent
390306c38d
commit
1604f488ac
@ -14,7 +14,9 @@
|
||||
#define CEPH_FEATURE_DIRLAYOUTHASH (1<<7)
|
||||
/* bits 8-17 defined by user-space; not supported yet here */
|
||||
#define CEPH_FEATURE_CRUSH_TUNABLES (1<<18)
|
||||
/* bits 19-25 defined by user-space; not supported yet here */
|
||||
/* bits 19-24 defined by user-space; not supported yet here */
|
||||
#define CEPH_FEATURE_CRUSH_TUNABLES2 (1<<25)
|
||||
/* bit 26 defined by user-space; not supported yet here */
|
||||
#define CEPH_FEATURE_REPLY_CREATE_INODE (1<<27)
|
||||
|
||||
/*
|
||||
@ -22,7 +24,8 @@
|
||||
*/
|
||||
#define CEPH_FEATURES_SUPPORTED_DEFAULT \
|
||||
(CEPH_FEATURE_NOSRCADDR | \
|
||||
CEPH_FEATURE_CRUSH_TUNABLES | \
|
||||
CEPH_FEATURE_CRUSH_TUNABLES | \
|
||||
CEPH_FEATURE_CRUSH_TUNABLES2 | \
|
||||
CEPH_FEATURE_REPLY_CREATE_INODE)
|
||||
|
||||
#define CEPH_FEATURES_REQUIRED_DEFAULT \
|
||||
|
@ -162,6 +162,8 @@ struct crush_map {
|
||||
__u32 choose_local_fallback_tries;
|
||||
/* choose attempts before giving up */
|
||||
__u32 choose_total_tries;
|
||||
/* attempt chooseleaf inner descent once; on failure retry outer descent */
|
||||
__u32 chooseleaf_descend_once;
|
||||
};
|
||||
|
||||
|
||||
|
@ -287,6 +287,7 @@ static int is_out(const struct crush_map *map, const __u32 *weight, int item, in
|
||||
* @outpos: our position in that vector
|
||||
* @firstn: true if choosing "first n" items, false if choosing "indep"
|
||||
* @recurse_to_leaf: true if we want one device under each item of given type
|
||||
* @descend_once: true if we should only try one descent before giving up
|
||||
* @out2: second output vector for leaf items (if @recurse_to_leaf)
|
||||
*/
|
||||
static int crush_choose(const struct crush_map *map,
|
||||
@ -295,7 +296,7 @@ static int crush_choose(const struct crush_map *map,
|
||||
int x, int numrep, int type,
|
||||
int *out, int outpos,
|
||||
int firstn, int recurse_to_leaf,
|
||||
int *out2)
|
||||
int descend_once, int *out2)
|
||||
{
|
||||
int rep;
|
||||
unsigned int ftotal, flocal;
|
||||
@ -399,6 +400,7 @@ static int crush_choose(const struct crush_map *map,
|
||||
x, outpos+1, 0,
|
||||
out2, outpos,
|
||||
firstn, 0,
|
||||
map->chooseleaf_descend_once,
|
||||
NULL) <= outpos)
|
||||
/* didn't get leaf */
|
||||
reject = 1;
|
||||
@ -422,7 +424,10 @@ reject:
|
||||
ftotal++;
|
||||
flocal++;
|
||||
|
||||
if (collide && flocal <= map->choose_local_tries)
|
||||
if (reject && descend_once)
|
||||
/* let outer call try again */
|
||||
skip_rep = 1;
|
||||
else if (collide && flocal <= map->choose_local_tries)
|
||||
/* retry locally a few times */
|
||||
retry_bucket = 1;
|
||||
else if (map->choose_local_fallback_tries > 0 &&
|
||||
@ -485,6 +490,7 @@ int crush_do_rule(const struct crush_map *map,
|
||||
int i, j;
|
||||
int numrep;
|
||||
int firstn;
|
||||
const int descend_once = 0;
|
||||
|
||||
if ((__u32)ruleno >= map->max_rules) {
|
||||
dprintk(" bad ruleno %d\n", ruleno);
|
||||
@ -544,7 +550,8 @@ int crush_do_rule(const struct crush_map *map,
|
||||
curstep->arg2,
|
||||
o+osize, j,
|
||||
firstn,
|
||||
recurse_to_leaf, c+osize);
|
||||
recurse_to_leaf,
|
||||
descend_once, c+osize);
|
||||
}
|
||||
|
||||
if (recurse_to_leaf)
|
||||
|
@ -170,6 +170,7 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
|
||||
c->choose_local_tries = 2;
|
||||
c->choose_local_fallback_tries = 5;
|
||||
c->choose_total_tries = 19;
|
||||
c->chooseleaf_descend_once = 0;
|
||||
|
||||
ceph_decode_need(p, end, 4*sizeof(u32), bad);
|
||||
magic = ceph_decode_32(p);
|
||||
@ -336,6 +337,11 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
|
||||
dout("crush decode tunable choose_total_tries = %d",
|
||||
c->choose_total_tries);
|
||||
|
||||
ceph_decode_need(p, end, sizeof(u32), done);
|
||||
c->chooseleaf_descend_once = ceph_decode_32(p);
|
||||
dout("crush decode tunable chooseleaf_descend_once = %d",
|
||||
c->chooseleaf_descend_once);
|
||||
|
||||
done:
|
||||
dout("crush_decode success\n");
|
||||
return c;
|
||||
|
Loading…
Reference in New Issue
Block a user