Commit Graph

71 Commits

Author SHA1 Message Date
Joe Perches
b9a678994b libceph: Convert pr_warning to pr_warn
Use the more common pr_warn.

Other miscellanea:

o Coalesce formats
o Realign arguments

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
2014-10-14 21:03:23 +04:00
Li RongQing
589506f1e7 libceph: fix a use after free issue in osdmap_set_max_osd
If the state variable is krealloced successfully, map->osd_state will be
freed, once following two reallocation failed, and exit the function
without resetting map->osd_state, map->osd_state become a wild pointer.

fix it by resetting them after krealloc successfully.

Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
2014-10-14 21:03:21 +04:00
Ilya Dryomov
f140662f35 crush: decode and initialize chooseleaf_vary_r
Commit e2b149cc4b ("crush: add chooseleaf_vary_r tunable") added the
crush_map::chooseleaf_vary_r field but missed the decode part.  This
lead to misdirected requests caused by incorrect raw crush mapping
sets.

Fixes: http://tracker.ceph.com/issues/8226

Reported-and-Tested-by: Dmitry Smirnov <onlyjob@member.fsf.org>
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2014-05-16 21:29:55 +04:00
Ilya Dryomov
92b2e75158 libceph: fix non-default values check in apply_primary_affinity()
osd_primary_affinity array is indexed into incorrectly when checking
for non-default primary-affinity values.  This nullifies the impact of
the rest of the apply_primary_affinity() and results in misdirected
requests.

                if (osds[i] != CRUSH_ITEM_NONE &&
                    osdmap->osd_primary_affinity[i] !=
                                                ^^^
                                        CEPH_OSD_DEFAULT_PRIMARY_AFFINITY) {

For a pool with size 2, this always ends up checking osd0 and osd1
primary_affinity values, instead of the values that correspond to the
osds in question.  E.g., given a [2,3] up set and a [max,max,0,max]
primary affinity vector, requests are still sent to osd2, because both
osd0 and osd1 happen to have max primary_affinity values and therefore
we return from apply_primary_affinity() early on the premise that all
osds in the given set have max (default) values.  Fix it.

Fixes: http://tracker.ceph.com/issues/7954

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2014-04-28 12:54:10 -07:00
Ilya Dryomov
f31da0f3e1 libceph: output primary affinity values on osdmap updates
Similar to osd weights, output primary affinity values on incremental
osdmap updates.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
2014-04-04 21:08:28 -07:00
Ilya Dryomov
c4c1228525 libceph: redo ceph_calc_pg_primary() in terms of ceph_calc_pg_acting()
Reimplement ceph_calc_pg_primary() in terms of ceph_calc_pg_acting()
and get rid of the now unused calc_pg_raw().

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:08:19 -07:00
Ilya Dryomov
47ec1f3cc4 libceph: add support for osd primary affinity
Respond to non-default primary_affinity values accordingly.  (Primary
affinity allows the admin to shift 'primary responsibility' away from
specific osds, effectively shifting around the read side of the
workload and whatever overhead is incurred by peering and writes by
virtue of being the primary).

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:08:17 -07:00
Ilya Dryomov
5e8d4d36bf libceph: add support for primary_temp mappings
Change apply_temp() to override primary in the same way pg_temp
overrides osd set.  primary_temp overrides pg_temp primary too.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:08:16 -07:00
Ilya Dryomov
8008ab1080 libceph: return primary from ceph_calc_pg_acting()
In preparation for adding support for primary_temp, stop assuming
primaryness: add a primary out parameter to ceph_calc_pg_acting() and
change call sites accordingly.  Primary is now specified separately
from the order of osds in the set.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:08:14 -07:00
Ilya Dryomov
ac972230e2 libceph: switch ceph_calc_pg_acting() to new helpers
Switch ceph_calc_pg_acting() to new helpers: pg_to_raw_osds(),
raw_to_up_osds() and apply_temps().

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:08:13 -07:00
Ilya Dryomov
45966c3467 libceph: introduce apply_temps() helper
apply_temp() helper for applying various temporary mappings (at this
point only pg_temp mappings) to the up set, therefore transforming it
into an acting set.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:08:11 -07:00
Ilya Dryomov
2bd93d4d7e libceph: introduce pg_to_raw_osds() and raw_to_up_osds() helpers
pg_to_raw_osds() helper for computing a raw (crush) set, which can
contain non-existant and down osds.

raw_to_up_osds() helper for pruning non-existant and down osds from the
raw set, therefore transforming it into an up set, and determining up
primary.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:08:10 -07:00
Ilya Dryomov
63a6993f52 libceph: primary_affinity decode bits
Add two helpers to decode primary_affinity (full map, vector<u32>) and
new_primary_affinity (inc map, map<u32, u32>) and switch to them.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:08:04 -07:00
Ilya Dryomov
2cfa34f2d6 libceph: primary_affinity infrastructure
Add primary_affinity infrastructure.  primary_affinity values are
stored in an max_osd-sized array, hanging off ceph_osdmap, similar to
a osd_weight array.

Introduce {get,set}_primary_affinity() helpers, primarily to return
CEPH_OSD_DEFAULT_PRIMARY_AFFINITY when no affinity has been set and to
abstract out osd_primary_affinity array allocation and initialization.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:08:02 -07:00
Ilya Dryomov
d286de796a libceph: primary_temp decode bits
Add a common helper to decode both primary_temp (full map, map<pg_t,
u32>) and new_primary_temp (inc map, same) and switch to it.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:08:00 -07:00
Ilya Dryomov
9686f94c8c libceph: primary_temp infrastructure
Add primary_temp mappings infrastructure.  struct ceph_pg_mapping is
overloaded, primary_temp mappings are stored in an rb-tree, rooted at
ceph_osdmap, in a manner similar to pg_temp mappings.

Dump primary_temp mappings to /sys/kernel/debug/ceph/<client>/osdmap,
one 'primary_temp <pgid> <osd>' per line, e.g:

    primary_temp 2.6 4

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:58 -07:00
Ilya Dryomov
35a935d75d libceph: generalize ceph_pg_mapping
In preparation for adding support for primary_temp mappings, generalize
struct ceph_pg_mapping so it can hold mappings other than pg_temp.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:57 -07:00
Ilya Dryomov
ec7af97258 libceph: introduce get_osdmap_client_data_v()
Full and incremental osdmaps are structured identically and have
identical headers.  Add a helper to decode both "old" (16-bit version,
v6) and "new" (8-bit struct_v+struct_compat+struct_len, v7) osdmap
enconding headers and switch to it.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:55 -07:00
Ilya Dryomov
10db634e20 libceph: introduce decode{,_new}_pg_temp() and switch to them
Consolidate pg_temp (full map, map<pg_t, vector<u32>>) and new_pg_temp
(inc map, same) decoding logic into a common helper and switch to it.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:53 -07:00
Ilya Dryomov
4d60351f90 libceph: switch osdmap_set_max_osd() to krealloc()
Use krealloc() instead of rolling our own.  (krealloc() with a NULL
first argument acts as a kmalloc()).  Properly initalize the new array
elements.  This is needed to make future additions to osdmap easier.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:52 -07:00
Ilya Dryomov
433fbdd31d libceph: introduce decode{,_new}_pools() and switch to them
Consolidate pools (full map, map<u64, pg_pool_t>) and new_pools (inc
map, same) decoding logic into a common helper and switch to it.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:50 -07:00
Ilya Dryomov
0f70c7eedb libceph: rename __decode_pool{,_names}() to decode_pool{,_names}()
To be in line with all the other osdmap decode helpers.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:49 -07:00
Ilya Dryomov
53bbaba9d8 libceph: fix and clarify ceph_decode_need() sizes
Sum up sizeof(...) results instead of (incorrectly) hard-coding the
number of bytes, expressed in ints and longs.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:47 -07:00
Ilya Dryomov
9464d00862 libceph: nuke bogus encoding version check in osdmap_apply_incremental()
Only version 6 of osdmap encoding is supported, anything other than
version 6 results in an error and halts the decoding process.  Checking
if version is >= 5 is therefore bogus.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:46 -07:00
Ilya Dryomov
86f1742b94 libceph: fixup error handling in osdmap_apply_incremental()
The existing error handling scheme requires resetting err to -EINVAL
prior to calling any ceph_decode_* macro.  This is ugly and fragile,
and there already are a few places where we would return 0 on error,
due to a missing reset.  Follow osdmap_decode() and fix this by adding
a special e_inval label to be used by all ceph_decode_* macros.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:44 -07:00
Ilya Dryomov
9902e682c7 libceph: fix crush_decode() call site in osdmap_decode()
The size of the memory area feeded to crush_decode() should be limited
not only by osdmap end, but also by the crush map length.  Also, drop
unnecessary dout() (dout() in crush_decode() conveys the same info) and
step past crush map only if it is decoded successfully.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:43 -07:00
Ilya Dryomov
2d88b2e081 libceph: check length of osdmap osd arrays
Check length of osd_state, osd_weight and osd_addr arrays.  They
should all have exactly max_osd elements after the call to
osdmap_set_max_osd().

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:41 -07:00
Ilya Dryomov
3977058c46 libceph: safely decode max_osd value in osdmap_decode()
max_osd value is not covered by any ceph_decode_need().  Use a safe
version of ceph_decode_* macro to decode it.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:40 -07:00
Ilya Dryomov
597b52f6ca libceph: fixup error handling in osdmap_decode()
The existing error handling scheme requires resetting err to -EINVAL
prior to calling any ceph_decode_* macro.  This is ugly and fragile,
and there already are a few places where we would return 0 on error,
due to a missing reset.  Fix this by adding a special e_inval label to
be used by all ceph_decode_* macros.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:38 -07:00
Ilya Dryomov
a2505d63ee libceph: split osdmap allocation and decode steps
Split osdmap allocation and initialization into a separate function,
ceph_osdmap_decode().

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:37 -07:00
Ilya Dryomov
38a8d56023 libceph: dump osdmap and enhance output on decode errors
Dump osdmap in hex on both full and incremental decode errors, to make
it easier to match the contents with error offset.  dout() map epoch
and max_osd value on success.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
2014-04-04 21:07:35 -07:00
Ilya Dryomov
9d521470a4 libceph: a per-osdc crush scratch buffer
With the addition of erasure coding support in the future, scratch
variable-length array in crush_do_rule_ary() is going to grow to at
least 200 bytes on average, on top of another 128 bytes consumed by
rawosd/osd arrays in the call chain.  Replace it with a buffer inside
struct osdmap and a mutex.  This shouldn't result in any contention,
because all osd requests were already serialized by request_mutex at
that point; the only unlocked caller was ceph_ioctl_get_dataloc().

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2014-04-03 10:33:50 +08:00
Ilya Dryomov
17a13e4028 libceph: follow {read,write}_tier fields on osd request submission
Overwrite ceph_osd_request::r_oloc.pool with read_tier for read ops and
write_tier for write and read+write ops (aka basic tiering support).
{read,write}_tier are part of pg_pool_t since v9.  This commit bumps
our pg_pool_t decode compat version from v7 to v9, all new fields
except for {read,write}_tier are ignored.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2014-01-27 23:57:45 +02:00
Ilya Dryomov
ce7f6a2790 libceph: add ceph_pg_pool_by_id()
"Lookup pool info by ID" function is hidden in osdmap.c.  Expose it to
the rest of libceph.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2014-01-27 23:57:40 +02:00
Ilya Dryomov
7c13cb6435 libceph: replace ceph_calc_ceph_pg() with ceph_oloc_oid_to_pg()
Switch ceph_calc_ceph_pg() to new oloc and oid abstractions and rename
it to ceph_oloc_oid_to_pg() to make its purpose more clear.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2014-01-27 23:57:32 +02:00
Ilya Dryomov
e8ef19c4ad crush: eliminate CRUSH_MAX_SET result size limitation
This is only present to size the temporary scratch arrays that we put on
the stack.  Let the caller allocate them as they wish and remove the
limitation.

Reflects ceph.git commit 1cfe140bf2dab99517589a82a916f4c75b9492d1.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2013-12-31 20:32:14 +02:00
Ilya Dryomov
b3b33b0e43 crush: pass weight vector size to map function
Pass the size of the weight vector into crush_do_rule() to ensure that we
don't access values past the end.  This can happen if the caller misbehaves
and passes a weight vector that is smaller than max_devices.

Currently the monitor tries to prevent that from happening, but this will
gracefully tolerate previous bad osdmaps that got into this state.  It's
also a bit more defensive.

Reflects ceph.git commit 5922e2c2b8335b5e46c9504349c3a55b7434c01a.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
2013-12-31 20:32:10 +02:00
Sage Weil
9542cf0bf9 libceph: use pg_num_mask instead of pgp_num_mask for pg.seed calc
Fix a typo that used the wrong bitmask for the pg.seed calculation.  This
is normally unnoticed because in most cases pg_num == pgp_num.  It is, however,
a bug that is easily corrected.

CC: stable@vger.kernel.org
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <alex.elder@linary.org>
2013-09-03 22:08:10 -07:00
Alex Elder
ef4859d647 libceph: define ceph_decode_pgid() only once
There are two basically identical definitions of __decode_pgid()
in libceph, one in "net/ceph/osdmap.c" and the other in
"net/ceph/osd_client.c".  Get rid of both, and instead define
a single inline version in "include/linux/ceph/osdmap.h".

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-05-01 21:17:52 -07:00
Alex Elder
41766f87f5 libceph: rename ceph_calc_object_layout()
The purpose of ceph_calc_object_layout() is to fill in the pool
number and seed for a ceph_pg structure provided, based on a given
osd map and target object id.

Currently that function takes a file layout parameter, but the only
thing used out of that is its pool number.

Change the function so it takes a pool number rather than the full
file layout structure.  Only update the ceph_pg if the pool is found
in the osd map.  Get rid of few useless lines of code from the
function while there.

Since the function now very clearly just fills in the ceph_pg
structure it's provided, rename it ceph_calc_ceph_pg().

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-05-01 21:16:17 -07:00
Sage Weil
d6c0dd6b0c libceph: fix decoding of pgids
In 4f6a7e5ee1 we effectively dropped support
for the legacy encoding for the OSDMap and incremental.  However, we didn't
fix the decoding for the pgid.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
2013-03-11 14:31:00 -07:00
Sage Weil
83ca14fdd3 libceph: add support for HASHPSPOOL pool flag
The legacy behavior adds the pgid seed and pool together as the input for
CRUSH.  That is problematic because each pool's PGs end up mapping to the
same OSDs: 1.5 == 2.4 == 3.3 == ...

Instead, if the HASHPSPOOL flag is set, we has the ps and pool together and
feed that into CRUSH.  This ensures that two adjacent pools will map to
an independent pseudorandom set of OSDs.

Advertise our support for this via a protocol feature flag.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2013-02-26 15:03:06 -08:00
Sage Weil
2169aea649 libceph: calculate placement based on the internal data types
Instead of using the old ceph_object_layout struct, update our internal
ceph_calc_object_layout method to use the ceph_pg type.  This allows us to
pass the full 32-bit precision of the pgid.seed to the callers.  It also
allows some callers to avoid reaching into the request structures for the
struct ceph_object_layout fields.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2013-02-26 15:02:37 -08:00
Sage Weil
4f6a7e5ee1 ceph: update support for PGID64, PGPOOL3, OSDENC protocol features
Support (and require) the PGID64, PGPOOL3, and OSDENC protocol features.
These have been present in ceph.git since v0.42, Feb 2012.  Require these
features to simplify support; nobody is running older userspace.

Note that the new request and reply encoding is still not in place, so the new
code is not yet functional.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2013-02-26 15:02:25 -08:00
Sage Weil
5b191d9914 libceph: decode into cpu-native ceph_pg type
Always decode data into our cpu-native ceph_pg type that has the correct
field widths.  Limit any remaining uses of ceph_pg_v1 to dealing with the
legacy protocol.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2013-02-26 15:01:57 -08:00
Sage Weil
12979354a1 libceph: rename ceph_pg -> ceph_pg_v1
Rename the old version this type to distinguish it from the new version.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2013-02-26 15:01:41 -08:00
Cong Ding
1ec3911dbd libceph: fix undefined behavior when using snprintf()
The variable "str" is used as both the source and destination in
function snprintf(), which is undefined behavior based on C11. The
original description in C11 is:
	"If copying takes place between objects that
	overlap, the behavior is undefined."

And, the function of ceph_osdmap_state_str() is to return the osdmap
state, so it should return "doesn't exist" when all the conditions
are not satisfied. I fix it in this patch.

[elder@inktank.com: shortened the commit message]

Signed-off-by: Cong Ding <dinggnu@gmail.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2013-01-25 17:48:59 -06:00
Alex Elder
e8afad656c libceph: pass length to ceph_calc_file_object_mapping()
ceph_calc_file_object_mapping() takes (among other things) a "file"
offset and length, and based on the layout, determines the object
number ("bno") backing the affected portion of the file's data and
the offset into that object where the desired range begins.  It also
computes the size that should be used for the request--either the
amount requested or something less if that would exceed the end of
the object.

This patch changes the input length parameter in this function so it
is used only for input.  That is, the argument will be passed by
value rather than by address, so the value provided won't get
updated by the function.

The value would only get updated if the length would surpass the
current object, and in that case the value it got updated to would
be exactly that returned in *oxlen.

Only one of the two callers is affected by this change.  Update
ceph_calc_raw_layout() so it records any updated value.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-01-17 15:52:04 -06:00
Jim Schutt
1604f488ac 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>
2013-01-17 12:42:39 -06:00
Alex Elder
72afc71ffc libceph: define ceph_pg_pool_name_by_id()
Define and export function ceph_pg_pool_name_by_id() to supply
the name of a pg pool whose id is given.  This will be used by
the next patch.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2012-11-01 07:55:42 -05:00