Hi !
it has been a while since I committed something in this repo. I finally
completed a big rewrite I started 2 years ago.
Basically, it was about supporting cross-B-tree transaction, something
that was badly missing in the previous release. There are many other
important changes :
- we don't support multi-values in a B-tree. If one want to stroe such
things, then the way to go is to create a B-tree aside if the number of
values is too big.
- The Btree of Btrees (aka BoB) that was used to store all the B-trees
versions for all the pending transactions has been replaced by a List of
B-trees. This is simpler to serialize on disk and simpler to manage
- The free pages management is currently disabled, but will soon be
reestablished. That mean the database file will continuously growth atm.
- We use Caffeine as a internal page cache
- One of the biggest advantage of having a cross-Btree transaction is
that we can now inject many elements before flushing the data on disk.
This speeds up insert if we can gather many of those updates into a
single commit (it can be one or two order of magnitude faster). For
LDAP, this is interesting because a LDAP update operation generally
involve the update of 10 or more B-trees, with some of them being
updated more than one - typically, the RDN index -. But it can also be
leveraged by the server itself as it now support the LDAP transaction
extended operation (https://tools.ietf.org/html/rfc5805). It can also be
used with great benefit for a bulk load, where we commit after 10 of
thousands entries addition.
There is more to do, and the first step is to add the free page
management. This is what I'm going to work on.
Thanks !
--
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Emmanuel Lécharny
CTO, Busit
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