[sheepdog] [PATCH v3 00/12] A new impelmentation of cluster snapshot
Kai Zhang
kyle at zelin.io
Tue May 14 10:31:29 CEST 2013
*Usage*
# save all readonly objects to local path
# local path should created before this command
# local path could save more than one cluster snapshot
collie cluster snapshot save /localpath
# list all cluster snapshot saved in local path
collie cluster snapshot list /localpath
# load a snapshot to a cluster
# this will format cluster firstly
# option "-e" is used to specify snapshot if there are more than one
# default is to load the last snapshot if user doesn't specify
collie cluster snapshot load /localpath
More details of usage and command outputs could be found in tests/030 which has been modified for new implementation.
*TODO*
1. compression of snapshot data in sha1 file
2. only read snapshot objects created after the latest cluster snapshot taken
3. reduce the size of sha1 file for better de-duplication
4. support for saving snapshot to other storage systems, including s3, hdfs, etc.
Any suggestions would be greatly appreciated:)
Thanks,
Klye
On May 14, 2013, at 3:51 PM, Kai Zhang <kyle at zelin.io> wrote:
> v3: including 10/12, 11/12 and 12/12 which are missed in the last email.
>
> v2: including new implementation of cluster snapshot
>
> Current way of doing cluster snapshot is very powerful and has great performance.
> However it also has some drawbacks:
> 1. After a new node joins the cluster, all former snapshots are not available to be restored.
> 2. It is hard to backup cluster snapshot to an other storage system for disaster-tolerance.
> 3. It is hard to init a new cluster by loading another cluster's snapshot.
>
> New idea is to move "farm" from sheep to collie and save cluster snapshot to a localpath.
>
> New cluster snapshot retains all features from "farm", including:
> 1. object de-duplication
> 2. incremental store capability
>
> In addition, it also provides ability of:
> 1. export cluster snapshot to other storage device for backup and disaster-tolerance
> 2. deploy new cluster by restore from one snapshot of other cluster
>
> The first 4 patches are used to remove farm from sheep.
> The others are used to re-implement farm under collie.
>
> Kai Zhang (12):
> sheep: change default store driver from "farm" to "plain"
> collie: remove snapshot from cluster subcommand
> script: remove script/simple2farm
> sheep: remove farm from sheep
> collie/farm: implement object_rb_tree
> collie/farm: implement sha1_file
> collie/farm: implement snap object
> collie/farm: impelement trunk object
> sheep: add a flag to let notify_vdi_add set bitmap if needed
> collie/farm: implement farm
> collie: implement "collie cluster snapshot" subcommand
> test: add tests/030 for cluster snapshot
>
> collie/Makefile.am | 4 +-
> collie/cluster.c | 154 ++++++++++++++----------
> collie/farm/farm.c | 252 ++++++++++++++++++++++++++++++++++++++
> collie/farm/farm.h | 84 +++++++++++++
> collie/farm/object_rb_tree.c | 148 +++++++++++++++++++++++
> collie/farm/sha1_file.c | 273 ++++++++++++++++++++++++++++++++++++++++++
> collie/farm/snap.c | 150 +++++++++++++++++++++++
> collie/farm/trunk.c | 75 ++++++++++++
> include/sheepdog_proto.h | 7 +-
> script/simple2farm | 51 --------
> sheep/Makefile.am | 10 +-
> sheep/farm/farm.c | 271 -----------------------------------------
> sheep/farm/farm.h | 68 -----------
> sheep/farm/sha1_file.c | 273 ------------------------------------------
> sheep/farm/snap.c | 152 -----------------------
> sheep/farm/trunk.c | 139 ---------------------
> sheep/ops.c | 65 +----------
> sheep/sheep_priv.h | 6 +-
> sheep/store.c | 1 -
> sheep/vdi.c | 1 +
> tests/001.out | 2 +-
> tests/002.out | 2 +-
> tests/003.out | 2 +-
> tests/004.out | 2 +-
> tests/005.out | 2 +-
> tests/006.out | 2 +-
> tests/007.out | 4 +-
> tests/008.out | 2 +-
> tests/009.out | 2 +-
> tests/010.out | 2 +-
> tests/013.out | 2 +-
> tests/014.out | 2 +-
> tests/015.out | 2 +-
> tests/016.out | 2 +-
> tests/017.out | 2 +-
> tests/018.out | 2 +-
> tests/019.out | 2 +-
> tests/020.out | 2 +-
> tests/021.out | 2 +-
> tests/022.out | 2 +-
> tests/023.out | 2 +-
> tests/024.out | 2 +-
> tests/025.out | 2 +-
> tests/026.out | 2 +-
> tests/027.out | 2 +-
> tests/028.out | 2 +-
> tests/029.out | 2 +-
> tests/030 | 77 +++++++++---
> tests/030.out | 20 +++-
> tests/031.out | 2 +-
> tests/032.out | 2 +-
> tests/033.out | 2 +-
> tests/034.out | 2 +-
> tests/035.out | 2 +-
> tests/036.out | 2 +-
> tests/037.out | 2 +-
> tests/038.out | 2 +-
> tests/039.out | 2 +-
> tests/040.out | 2 +-
> tests/041.out | 2 +-
> tests/042.out | 2 +-
> tests/043.out | 2 +-
> tests/044.out | 2 +-
> tests/045.out | 2 +-
> tests/046.out | 2 +-
> tests/047.out | 2 +-
> tests/048.out | 2 +-
> tests/049.out | 2 +-
> tests/050.out | 2 +-
> tests/051.out | 2 +-
> tests/052.out | 2 +-
> tests/053.out | 2 +-
> tests/054.out | 2 +-
> tests/055.out | 2 +-
> tests/056.out | 2 +-
> tests/057.out | 2 +-
> tests/058.out | 2 +-
> tests/059.out | 2 +-
> 78 files changed, 1223 insertions(+), 1172 deletions(-)
> create mode 100644 collie/farm/farm.c
> create mode 100644 collie/farm/farm.h
> create mode 100644 collie/farm/object_rb_tree.c
> create mode 100644 collie/farm/sha1_file.c
> create mode 100644 collie/farm/snap.c
> create mode 100644 collie/farm/trunk.c
> delete mode 100755 script/simple2farm
> delete mode 100644 sheep/farm/farm.c
> delete mode 100644 sheep/farm/farm.h
> delete mode 100644 sheep/farm/sha1_file.c
> delete mode 100644 sheep/farm/snap.c
> delete mode 100644 sheep/farm/trunk.c
>
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