diff options
| author | Jeff Darcy <jdarcy@redhat.com> | 2014-05-07 19:31:30 +0000 |
|---|---|---|
| committer | Vijay Bellur <vbellur@redhat.com> | 2015-05-09 21:55:09 -0700 |
| commit | 243d61575c093c03b9beb014bf9d097646836e95 (patch) | |
| tree | afaccb59310013c4f7c6bb867231c4d8988a697c /libglusterfs | |
| parent | 58ef6a233f43bc644be55d2b5510b12718a6835e (diff) | |
dht: make lookup-unhashed=auto do something actually useful
The key concept here is to determine whether a directory is "clean" by
comparing its last-known-good topology to the current one for the
volume. These are stored as "commit hashes" on the directory and the
volume root respectively. The volume's commit hash changes whenever a
brick is added or removed, and a fix-layout is done. A directory's
commit hash changes only when a full rebalance (not just fix-layout)
is done on it. If all bricks are present and have a directory
commit hash that matches the volume commit hash, then we can assume
that every file is in its "proper" place. Therefore, if we look for
a file in that proper place and don't find it, we can assume it's not
on any other subvolume and *safely* skip the global (broadcast to all)
lookup.
Change-Id: Id6ce4593ba1f7daffa74cfab591cb45960629ae3
BUG: 1220064
Reviewed-on-master: http://review.gluster.org/#/c/7702/
Signed-off-by: Jeff Darcy <jdarcy@redhat.com>
Signed-off-by: Shyam <srangana@redhat.com>
Reviewed-on: http://review.gluster.org/10729
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Diffstat (limited to 'libglusterfs')
| -rw-r--r-- | libglusterfs/src/glusterfs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h index b26580f1ec9..3843bb76ed9 100644 --- a/libglusterfs/src/glusterfs.h +++ b/libglusterfs/src/glusterfs.h @@ -227,6 +227,7 @@ (iabuf)->ia_type) & ~S_IFMT)\ == DHT_LINKFILE_MODE) #define DHT_LINKFILE_STR "linkto" +#define DHT_COMMITHASH_STR "commithash" #define DHT_SKIP_NON_LINKTO_UNLINK "unlink-only-if-dht-linkto-file" #define DHT_SKIP_OPEN_FD_UNLINK "dont-unlink-for-open-fd" |