On 30/09/14 17:05, Sage Weil wrote:
On Tue, 30 Sep 2014, Haomai Wang wrote:
Hi sage,
What do you think use existing ObjectStore::peek_journal_fsid
interface to detect whether journal needed.
KeyValueStore and MemStore could set passing argument "fsid" to zero
to indicate no journal.
I'm not sure it's a good fit... it's called on an existing store and tells
you something about it. I would probably expect a zeroed fsid to mean
that the specified journal is empty or does not exist, not that it doesn't
need to exist.
What we need, on the other hand, is something that just tells us whether
we should create a journal...
And perhaps the "type" (probably not the right word) of journal:
- filestore: device or filesystem
- rocksdb: filesystem (wal directory)
- leveldb: none (I think)
FWIW, it looks like the log files for leveldb *could* benefit from being
placed somewhere else (e.g on faster storage). Is it worthwhile
suggesting to the leveldb devs?
Cheers
Mark
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