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Our current implementation for closing an LRU DB involves a full scan
of a public ets table. This scan blocks all other activity in
couch_server and can become a serious bottleneck when the LRU cache hit
rate drops too low. In the worst-case all_dbs_active scenario we end up
with O(N**2) algorithmic complexity.
This patch adds a new index keyed on LRU for faster access to the least
recently used databases. It also moves the ets table to a dict on the
couch_server heap. The downside is an increased message rate inbound on
the couch_server, as clients are no longer allowed to update the LRU
data structures without sending a message.
BugzID: 12879
Conflicts:
apps/couch/src/couch_server.erl
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The race condition in couch_server's ets table usage rears its ugly head
by leaving an entry in couch_lru. This patch just addresses the issue by
allowing the client pid to use the db and ignores the fact that for the
duration its over the max_dbs_open setting.
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The `created` event is emitted on apache couchdb when a database is
created. This patch re-add it to bigcouch.
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This patch has the side effect of fixing a crash of the _users DB after
the first minute of running. The crash occurs because BigCouch presumes
that couch_stats_collector is monitoring the file descriptor, but
nothing prevents the supervisor from starting couch_auth_cache (and thus
opening the _users DB) before couch_stats_collector is started. The
start order is determined by the ordering of the children from the
config file in couch_config's ets set.
Closes #39
BugzID: 11854
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BugzID: 10162
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- Removal of couch_db and couch_ref_counter processes. Active DBs are
accessible through a protected ets table owned by couch_server.
- #full_doc_info{} in by_id and by_seq trees for faster compaction at the
expense of more disk usage afterwards. Proposed as COUCHDB-738 but not
accepted upstream.
- Replication via distributed Erlang.
- Better hot upgrade support (uses exported functions much more often).
- Configurable btree chunk sizes allow for larger (but still bounded)
reductions.
- Shorter names for btree fields in #db{} and #db_header{}.
- couch_view_group does not keep a reference to the #db{}.
- Terms are stored compressed (again).
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