On Wed, 18 Nov 2015, Ning Yao wrote:
> Hi, Sage
>
> pgmeta object is a meta-object (like __head_00000000__2) without
> significant information. It is created when in PG::_init() when
> handling pg_create and split_coll and always exits there during pg's
> life cycle until pg is removed in RemoveWQ. The real content related
> to pgmeta-data is stored in omap. we may just treat pgmeta-object as a
> logical object and not present it physically so that we can avoid
> recursive searching object path by if(hoid.pgmeta())?
> such as:
> int FileStore::_omap_setkeys(coll_t cid, const ghobject_t &hoid,
> const map<string, bufferlist> &aset,
> const SequencerPosition &spos) {
> dout(15) << __func__ << " " << cid << "/" << hoid << dendl;
> Index index;
> int r;
> if(hoid.pgmeta())
> goto out;
> ***
> ***
> ***
> out:
> r = object_map->set_keys(hoid, aset, &spos);
> dout(20) << __func__ << " " << cid << "/" << hoid << " = " << r << dendl;
> return r;
> }
This seems like a reasonable hack. We never store any byte data in it.
And if/when that changes, we can change this at the same time.
sage
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