| Age | Commit message (Collapse) | Author |
|---|
|
|
|
When system load exceeds the ability of os_process_soft_limit to keep
up with demand we enter a fork-use-kill (FUK) cycle. The constant
spawning and destruction os these processes thrashes system resources
and causes general instability.
This patch changes the behavior from killing each process as its
returned to letting it idle for a configurable amount of time (default
five minutes) which allows it to be reused by other clients. This way we
can avoid adding unnecessary load when demand for couchjs processes
exceeds os_process_soft_limit.
As a happy benefit this should also allow os_process_soft_limit to be
set much lower since the number of processes will now more closely
follow actual demand (instead of provisioning for the worst case
scenario).
Conflicts:
apps/couch/src/couch_os_process.erl
apps/couch/src/couch_proc_manager.erl
Conflicts:
apps/couch/src/couch_os_process.erl
|
|
Conflicts:
apps/couch/include/couch_db.hrl
apps/couch/src/couch_db.erl
apps/couch/src/couch_os_process.erl
apps/couch/src/couch_query_servers.erl
apps/couch/src/couch_rep.erl
apps/couch/src/couch_replication_manager.erl
apps/couch/src/couch_view_compactor.erl
apps/couch/src/couch_view_group.erl
apps/couch/src/couch_view_updater.erl
configure.ac
couchjs/c_src/http.c
couchjs/c_src/main.c
couchjs/c_src/utf8.c
etc/windows/couchdb.iss.tpl
src/couchdb/priv/Makefile.am
src/couchdb/priv/couch_js/main.c
test/etap/160-vhosts.t
test/etap/200-view-group-no-db-leaks.t
test/etap/Makefile.am
BugzID: 12645
|
|
|
|
- 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).
|
|
|
