This is an automated email from the ASF dual-hosted git repository. davisp pushed a commit to branch optimize-ddoc-cache in repository https://gitbox.apache.org/repos/asf/couchdb.git
commit ee00280fea0698fa30cab2bd78f0818dc67cee42 Author: Paul J. Davis <[email protected]> AuthorDate: Thu Jul 20 14:02:57 2017 -0500 FIXUP: Process processes in the process of dying Turns out we could go to evict an entry just after it had decided to leave the cache (i.e., its ddoc was just deleted). When that happens ddoc_cache_lru would die trying to shut the process down becuase the process died normal earlier than expected. --- src/ddoc_cache/src/ddoc_cache_entry.erl | 20 +++++++++++++++----- src/ddoc_cache/test/ddoc_cache_entry_test.erl | 17 +++++++++++++++++ 2 files changed, 32 insertions(+), 5 deletions(-) diff --git a/src/ddoc_cache/src/ddoc_cache_entry.erl b/src/ddoc_cache/src/ddoc_cache_entry.erl index 63a2efa..77539eb 100644 --- a/src/ddoc_cache/src/ddoc_cache_entry.erl +++ b/src/ddoc_cache/src/ddoc_cache_entry.erl @@ -77,7 +77,17 @@ start_link(Key, Default) -> shutdown(Pid) -> - ok = gen_server:call(Pid, shutdown). + Ref = erlang:monitor(process, Pid), + ok = gen_server:cast(Pid, shutdown), + receive + {'DOWN', Ref, process, Pid, normal} -> + ok; + {'DOWN', Ref, process, Pid, Reason} -> + erlang:exit(Reason) + after ?SHUTDOWN_TIMEOUT -> + erlang:demonitor(Ref, [flush]), + erlang:exit({timeout, {entry_shutdown, Pid}}) + end. open(Pid, Key) -> @@ -170,10 +180,6 @@ handle_call(open, From, #st{opener = Pid} = St) when is_pid(Pid) -> handle_call(open, _From, St) -> {reply, St#st.val, St}; -handle_call(shutdown, _From, St) -> - remove_from_cache(St), - {stop, normal, ok, St}; - handle_call(Msg, _From, St) -> {stop, {bad_call, Msg}, {bad_call, Msg}, St}. @@ -227,6 +233,10 @@ handle_cast(refresh, #st{opener = Pid} = St) when is_pid(Pid) -> }, {noreply, NewSt}; +handle_cast(shutdown, St) -> + remove_from_cache(St), + {stop, normal, St}; + handle_cast(Msg, St) -> {stop, {bad_cast, Msg}, St}. diff --git a/src/ddoc_cache/test/ddoc_cache_entry_test.erl b/src/ddoc_cache/test/ddoc_cache_entry_test.erl index 381185c..c481bcf 100644 --- a/src/ddoc_cache/test/ddoc_cache_entry_test.erl +++ b/src/ddoc_cache/test/ddoc_cache_entry_test.erl @@ -52,6 +52,7 @@ check_entry_test_() -> fun kill_opener_on_terminate/1, fun evict_when_not_accessed/1, fun open_dead_entry/1, + fun handles_bad_shutdown/1, fun handles_bad_messages/1, fun handles_code_change/1 ]} @@ -125,6 +126,22 @@ open_dead_entry({DbName, _}) -> ?assertEqual(recover(DbName), ddoc_cache_entry:open(Pid, Key)). +handles_bad_shutdown(_) -> + ErrorPid = spawn(fun() -> + receive + _ -> exit(bad_shutdown) + end + end), + ?assertExit(bad_shutdown, ddoc_cache_entry:shutdown(ErrorPid)), + NotDeadYetPid = spawn(fun() -> + timer:sleep(infinity) + end), + ?assertExit( + {timeout, {entry_shutdown, NotDeadYetPid}}, + ddoc_cache_entry:shutdown(NotDeadYetPid) + ). + + handles_bad_messages(_) -> CallExpect = {stop, {bad_call, foo}, {bad_call, foo}, baz}, CastExpect = {stop, {bad_cast, foo}, bar}, -- To stop receiving notification emails like this one, please contact "[email protected]" <[email protected]>.
