Hi Lisa, your presentation last week at Cephalocon was quite convincing.
Recordings aren't available yet, so perhaps you can share your slides.
For those who weren't there, Lisa tested many configurations of rocksdb
with bluestore to attempt to keep the pg log out of level 0 in rocksdb,
and thus avoid a large source of write amplification.
None of these tunings were successful, so the conclusion was that the pg
log ought to be stored outside of rocksdb.
Lisa, what are your thoughts on how to store the pg log?
For historical reference, it was moved into leveldb originally to make
it easier to program against correctly [0], but the current PGLog code
has grown too complex despite that.
Josh
[0]
https://github.com/ceph/ceph/commit/1ef94200e9bce5e0f0ac5d1e563421a9d036c203
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