Release Notes
===============
+v0.85
+=====
+
+This is the second-to-last development release before Giant that
+contains new functionality. The big items to land during this cycle
+are the messenger refactoring from Matt Benjmain that lays some
+groundwork for RDMA support, a performance improvement series from
+SanDisk that improves performance on SSDs, lots of improvements to our
+new standalone civetweb-based RGW frontend, and a new 'osd blocked-by'
+mon command that allows admins to easily identify which OSDs are
+blocking peering progress. The other big change is that the OSDs and
+Monitors now distinguish between "misplaced" and "degraded" objects:
+the latter means there are fewer copies than we'd like, while the
+former simply means the are not stored in the locations where we want
+them to be.
+
+Also of note is a change to librbd that enables client-side caching by
+default. This is coupled with another option that makes the cache
+write-through until a "flush" operations is observed: this implies
+that the librbd user (usually a VM guest OS) supports barriers and
+flush and that it is safe for the cache to switch into writeback mode
+without compromising data safety or integrity. It has long been
+recommended practice that these options be enabled (e.g., in OpenStack
+environments) but until now it has not been the default.
+
+We have frozen the tree for the looming Giant release, and the next
+development release will be a release candidate with a final batch of
+new functionality.
+
+Upgrading
+---------
+
+* The client-side caching for librbd is now enabled by default (rbd
+ cache = true). A safety option (rbd cache writethrough until flush
+ = true) is also enabled so that writeback caching is not used until
+ the library observes a 'flush' command, indicating that the librbd
+ users is passing that operation through from the guest VM. This
+ avoids potential data loss when used with older versions of qemu
+ that do not support flush.
+
+ leveldb_write_buffer_size = 32*1024*1024 = 33554432 // 32MB
+ leveldb_cache_size = 512*1024*1204 = 536870912 // 512MB
+ leveldb_block_size = 64*1024 = 65536 // 64KB
+ leveldb_compression = false
+ leveldb_log = ""
+
+ OSDs will still maintain the following osd-specific defaults:
+
+ leveldb_log = ""
+
+* The 'rados getxattr ...' command used to add a gratuitous newline to the attr
+ value; it now does not.
+
+Notable Changes
+---------------
+
+* ceph-disk: do not inadvertantly create directories (Owne Synge)
+* ceph-disk: fix dmcrypt support (Sage Weil)
+* ceph-disk: linter cleanup, logging improvements (Alfredo Deza)
+* ceph-disk: show information about dmcrypt in 'ceph-disk list' output (Sage Weil)
+* ceph-disk: use partition type UUIDs and blkid (Sage Weil)
+* ceph: fix for non-default cluster names (#8944, Dan Mick)
+* doc: document new upstream wireshark dissector (Kevin Cox)
+* doc: many install doc updates (John Wilkins)
+* librados: fix lock leaks in error paths (#9022, Paval Rallabhandi)
+* librados: fix pool existence check (#8835, Pavan Rallabhandi)
+* librbd: enable caching by default (Sage Weil)
+* librbd: fix crash using clone of flattened image (#8845, Josh Durgin)
+* librbd: store and retrieve snapshot metadata based on id (Josh Durgin)
+* mailmap: many updates (Loic Dachary)
+* mds: add min/max UID for snapshot creation/deletion (#9029, Wido den Hollander)
+* misc build errors/warnings for Fedora 20 (Boris Ranto)
+* mon: add 'osd blocked-by' command to easily see which OSDs are blocking peering progress (Sage Weil)
+* mon: add perfcounters for paxos operations (Sage Weil)
+* mon: create default EC profile if needed (Loic Dachary)
+* mon: fix crash on loopback messages and paxos timeouts (#9062, Sage Weil)
+* mon: fix divide by zero when pg_num is adjusted before OSDs are added (#9101, Sage Weil)
+* mon: fix occasional memory leak after session reset (#9176, Sage Weil)
+* mon: fix ruleset/ruleid bugs (#9044, Loic Dachary)
+* mon: make usage dumps in terms of bytes, not kB (Sage Weil)
+* mon: prevent implicit destruction of OSDs with 'osd setmaxosd ...' (#8865, Anand Bhat)
+* mon: verify all quorum members are contiguous at end of Paxos round (#9053, Sage Weil)
+* msgr: refactor to cleanly separate SimpleMessenger implemenetation, move toward Connection-based calls (Matt Benjamin, Sage Wei)
+* objectstore: clean up KeyValueDB interface for key/value backends (Sage Weil)
+* osd: add local_mtime for use by cache agent (Zhiqiang Wang)
+* osd: add superblock for KeyValueStore backend (Haomai Wang)
+* osd: add support for Intel ISA-L erasure code library (Andreas-Joachim Peters)
+* osd: do not skip promote for write-ordered reads (#9064, Samuel Just)
+* osd: fix ambigous encoding order for blacklisted clients (#9211, Sage Weil)
+* osd: fix cache flush corner case for snapshotted objects (#9054, Samuel Just)
+* osd: fix discard of old/obsolete subop replies (#9259, Samuel Just)
+* osd: fix discard of peer messages from previous intervals (Greg Farnum)
+* osd: fix dump of open fds on EMFILE (Sage Weil)
+* osd: fix journal dump (Ma Jianpeng)
+* osd: fix mon feature bit requirements bug and resulting log spam (Sage Weil)
+* osd: fix recovery chunk size usage during EC recovery (Ma Jianpeng)
+* osd: fix recovery reservation deadlock for EC pools (Samuel Just)
+* osd: fix removal of old xattrs when overwriting chained xattrs (Ma Jianpeng)
+* osd: fix requesting queueing on PG split (Samuel Just)
+* osd: force new xattrs into leveldb if fs returns E2BIG (#7779, Sage Weil)
+* osd: implement alignment on chunk sizes (Loic Dachary)
+* osd: improve prioritization of recovery of degraded over misplaced objects (Sage Weil)
+* osd: locking, sharding, caching improvements in FileStore's FDCache (Somnath Roy, Greg Farnum)
+* osd: many important bug fixes (Samuel Just)
+* osd, mon: add rocksdb support (Xinxin Shu, Sage Weil)
+* osd, mon: distinguish between "misplaced" and "degraded" objects in cluster health and PG state reporting (Sage Weil)
+* osd: refactor some ErasureCode functionality into command parent class (Loic Dachary)
+* osd: set rollback_info_completed on create (#8625, Samuel Just)
+* rados: allow setxattr value to be read from stdin (Sage Weil)
+* rados: drop gratuitous \n from getxattr command (Sage Weil)
+* rgw: add --min-rewrite-stripe-size for object restriper (Yehuda Sadeh)
+* rgw: add powerdns hook for dynamic DNS for global clusters (Wido den Hollander)
+* rgw: copy object data is target bucket is in a different pool (#9039, Yehuda Sadeh)
+* rgw: do not try to authenticate CORS preflight requests (#8718, Robert Hubbard, Yehuda Sadeh)
+* rgw: fix civetweb URL decoding (#8621, Yehuda Sadeh)
+* rgw: fix removal of objects during object creation (Patrycja Szablowska, Yehuda Sadeh)
+* rgw: fix striping for copied objects (#9089, Yehuda Sadeh)
+* rgw: fix test for identify whether an object has a tail (#9226, Yehuda Sadeh)
+* rgw: fix when stripe size is not a multiple of chunk size (#8937, Yehuda Sadeh)
+* rgw: improve civetweb logging (Yehuda Sadeh)
+* rgw: misc civetweb frontend fixes (Yehuda Sadeh)
+* sysvinit: add support for non-default cluster names (Alfredo Deza)
+
+
v0.84
=====
projects / ceph.git / commitdiff