diff options
| author | Dan Lambright <dlambrig@redhat.com> | 2015-11-04 15:33:22 -0500 |
|---|---|---|
| committer | Dan Lambright <dlambrig@redhat.com> | 2015-11-23 04:05:55 -0800 |
| commit | 3b52c71b0ab57a9daaf31bf3dc8563da37927a66 (patch) | |
| tree | 2d47ba199f5cde08b2d9b639670d0ed5c75204b6 /xlators/cluster/dht/src/tier.h | |
| parent | f12efd1827077292eba08a109d212a25c62476fe (diff) | |
cluster/tier: readdirp to cold tier only
It is possible a file would get migrated in the middle
of a readdir operation. If there are four subvolumes A,B,C,D,
and if readdir reads them in order and reaches subvol B,
then, if a file is moved from D to A, it will not be included
in the readdir output.
This phenonema has pre-existed in DHT migration but is more
apparent in tiering.
When a file is moved off the hashed subvolume a T file is created.
For tiering, we will make the cold subvolume the hashed subvolume.
This will ensure the creation of a T file. Readdir will not skip T
files in the tier translator.
Making the cold subvolume the hashed subvolume ensures the T
files created on promotions or creates will be less likely to
fill the volume.
Creates still put the data on the hot subvolume.
Change-Id: Ifde557d3d0e94a4570ca9f115adee3db2ee75407
BUG: 1281598
Signed-off-by: Dan Lambright <dlambrig@redhat.com>
Reviewed-on: http://review.gluster.org/12530
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: N Balachandran <nbalacha@redhat.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Diffstat (limited to 'xlators/cluster/dht/src/tier.h')
| -rw-r--r-- | xlators/cluster/dht/src/tier.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/xlators/cluster/dht/src/tier.h b/xlators/cluster/dht/src/tier.h index 2a72ae2caf6..92e2fda6e5c 100644 --- a/xlators/cluster/dht/src/tier.h +++ b/xlators/cluster/dht/src/tier.h @@ -33,7 +33,8 @@ #define PROMOTION_QFILE "promotequeryfile" #define DEMOTION_QFILE "demotequeryfile" -#define TIER_HASHED_SUBVOL conf->subvolumes[1] +#define TIER_HASHED_SUBVOL conf->subvolumes[0] +#define TIER_UNHASHED_SUBVOL conf->subvolumes[1] #define GET_QFILE_PATH(is_promotion)\ (is_promotion) ? promotion_qfile : demotion_qfile |