On Thu, Jul 31, 2014 at 2:41 AM, yuelongguang <fastsync at 163.com> wrote: > hi,all > 1. > it seems that there are 2 kinds of function that get/set xattrs. > one kind start with collection_*,the another one start with omap_*. > what is the differences between them, and what xattrs use which kind of > function? IIRC, the collection_* functions are storing data in the local filesystem xattrs, while omap_* functions are storing data in omap (aka leveldb, by default) keys for that file. These are not distinguishable by the user; they're just xattrs. > 2. > there is a xattr that tells whethe xattrs are stored on leveldb , what is > that xattr? #define XATTR_SPILL_OUT_NAME "user.cephos.spill_out" Of course, these answers are specific to the FileStore implementation, and it's all invisible to upper layers... -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com
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