Ceph v0.92 发布，分布式文件系统

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Ceph v0.92 发布，此版本主要改进如下：

• OSD 对象校验

• 缓存层读入代理

• RBD 图片锁

• 优化 OSD 事物和复制信息

• 大量的 RGW 和 MDS bug 修复

升级

• The experimental ‘keyvaluestore-dev’ OSD backend has been renamed ‘keyvaluestore’ (for simplicity) and marked as experimental.

• The following librados C API function calls take a ‘flags’ argument whose value is now correctly interpreted:

  rados_write_op_operate() rados_aio_write_op_operate() rados_read_op_operate() rados_aio_read_op_operate()

• The ‘rados’ CLI ‘copy’ and ‘cppool’ commands now use the copy-from operation

• The librados watch/notify API now includes a watch_flush() operation to flush the async queue of notify operations.

值得关注的改进

• add experimental features option (Sage Weil)

• build: fix ‘make check’ races (#10384 Loic Dachary)

• build: fix pkg names when libkeyutils is missing (Pankag Garg, Ken Dreyer)

• ceph: make ‘ceph -s’ show PG state counts in sorted order (Sage Weil)

• ceph: make ‘ceph tell mon.* version’ work (Mykola Golub)

• ceph-monstore-tool: fix/improve CLI (Joao Eduardo Luis)

• ceph: show primary-affinity in ‘ceph osd tree’ (Mykola Golub)

• common: add TableFormatter (Andreas Peters)

• common: check syncfs() return code (Jianpeng Ma)

• doc: do not suggest dangerous XFS nobarrier option (Dan van der Ster)

• doc: misc updates (Nilamdyuti Goswami, John Wilkins)

• install-deps.sh: do not require sudo when root (Loic Dachary)

• libcephfs: fix dirfrag trimming (#10387 Yan, Zheng)

• libcephfs: fix mount timeout (#10041 Yan, Zheng)

• libcephfs: fix test (#10415 Yan, Zheng)

• libcephfs: fix use-afer-free on umount (#10412 Yan, Zheng)

• libcephfs: include ceph and git version in client metadata (Sage Weil)

• librados: add watch_flush() operation (Sage Weil, Haomai Wang)

• librados: avoid memcpy on getxattr, read (Jianpeng Ma)

• librados: create ioctx by pool id (Jason Dillaman)

• librados: do notify completion in fast-dispatch (Sage Weil)

• librados: remove shadowed variable (Kefu Chain)

• librados: translate op flags from C APIs (Matthew Richards)

• librbd: differentiate between R/O vs R/W features (Jason Dillaman)

• librbd: exclusive image locking (Jason Dillaman)

• librbd: fix write vs import race (#10590 Jason Dillaman)

• librbd: gracefully handle deleted/renamed pools (#10270 Jason Dillaman)

• mds: asok command for fetching subtree map (John Spray)

• mds: constify MDSCacheObjects (John Spray)

• misc: various valgrind fixes and cleanups (Danny Al-Gaaf)

• mon: fix ‘mds fail’ for standby MDSs (John Spray)

• mon: fix stashed monmap encoding (#5203 Xie Rui)

• mon: implement ‘fs reset’ command (John Spray)

• mon: respect down flag when promoting standbys (John Spray)

• mount.ceph: fix suprious error message (#10351 Yan, Zheng)

• msgr: async: many fixes, unit tests (Haomai Wang)

• msgr: simple: retry binding to port on failure (#10029 Wido den Hollander)

• osd: add fadvise flags to ObjectStore API (Jianpeng Ma)

• osd: add get_latest_osdmap asok command (#9483 #9484 Mykola Golub)

• osd: EIO on whole-object reads when checksum is wrong (Sage Weil)

• osd: filejournal: don’t cache journal when not using direct IO (Jianpeng Ma)

• osd: fix ioprio option (Mykola Golub)

• osd: fix scrub delay bug (#10693 Samuel Just)

• osd: fix watch reconnect race (#10441 Sage Weil)

• osd: handle no-op write with snapshot (#10262 Sage Weil)

• osd: journal: fix journal zeroing when direct IO is enabled (Xie Rui)

• osd: keyvaluestore: cleanup dead code (Ning Yao)

• osd, mds: ‘ops’ as shorthand for ‘dump_ops_in_flight’ on asok (Sage Weil)

• osd: memstore: fix size limit (Xiaoxi Chen)

• osd: misc scrub fixes (#10017 Loic Dachary)

• osd: new optimized encoding for ObjectStore::Transaction (Dong Yuan)

• osd: optimize filter_snapc (Ning Yao)

• osd: optimize WBThrottle map with unordered_map (Ning Yao)

• osd: proxy reads during cache promote (Zhiqiang Wang)

• osd: proxy read support (Zhiqiang Wang)

• osd: remove legacy classic scrub code (Sage Weil)

• osd: remove unused fields in MOSDSubOp (Xiaoxi Chen)

• osd: replace MOSDSubOp messages with simpler, optimized MOSDRepOp (Xiaoxi Chen)

• osd: store whole-object checksums on scrub, write_full (Sage Weil)

• osd: verify kernel is new enough before using XFS extsize ioctl, enable by default (#9956 Sage Weil)

• rados: use copy-from operation for copy, cppool (Sage Weil)

• rgw: change multipart upload id magic (#10271 Yehuda Sadeh)

• rgw: decode http query params correction (#10271 Yehuda Sadeh)

• rgw: fix content length check (#10701 Axel Dunkel, Yehuda Sadeh)

• rgw: fix partial GET in swift (#10553 Yehuda Sadeh)

• rgw: fix shutdown (#10472 Yehuda Sadeh)

• rgw: include XML ns on get ACL request (#10106 Yehuda Sadeh)

• rgw: misc fixes (#10307 Yehuda Sadeh)

• rgw: only track cleanup for objects we write (#10311 Yehuda Sadeh)

• rgw: tweak error codes (#10329 #10334 Yehuda Sadeh)

• rgw: use gc for multipart abort (#10445 Aaron Bassett, Yehuda Sadeh)

• sysvinit: fix race in ‘stop’ (#10389 Loic Dachary)

• test: fix bufferlist tests (Jianpeng Ma)

• tests: improve docker-based tests (Loic Dachary)

获取 CEPH

• Git at git://github.com/ceph/ceph.git

• Tarball at http://ceph.com/download/ceph-0.92.tar.gz

• For packages, see http://ceph.com/docs/master/install/get-packages

• For ceph-deploy, see http://ceph.com/docs/master/install/install-ceph-deploy

更多内容请看 这里 。

Ceph是加州大学Santa Cruz分校的Sage Weil（DreamHost的联合创始人）专为博士论文设计的新一代自由软件分布式文件系统。自2007年毕业之后，Sage开始全职投入到Ceph开 发之中，使其能适用于生产环境。Ceph的主要目标是设计成基于POSIX的没有单点故障的分布式文件系统，使数据能容错和无缝的复制。2010年3 月，Linus Torvalds将Ceph client合并到内 核2.6.34中。IBM开发者园地的一篇文章探讨了Ceph的架构，它的容错实现和简化海量数据管理的功能。

Ceph 中文文档： http://docs.openfans.org/ceph

Ceph 的 4 个模块：