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https://issues.apache.org/jira/browse/MESOS-7122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15872255#comment-15872255
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James Peach commented on MESOS-7122:
------------------------------------
{quote}
As far as I can tell we can apply this template to nearly every Process that
exposes futures to callers and justify using threads instead of Processes?
{quote}
I don't think I understood you correctly here. It sounds like you are saying
that every API that returns a {{Future}} ought to be a separate thread? Since
basically everything returns a {{Future}}, that doesn't seem practical.
My intention with this ticket was to address the specific case of the process
reaper, not the general case of libprocess being able to guarantee forward
progress. The question of whether the HDFS client really needs to block is also
a separate JIRA IMHO.
> Process reaper should have a dedicated thread to avoid deadlock.
> ----------------------------------------------------------------
>
> Key: MESOS-7122
> URL: https://issues.apache.org/jira/browse/MESOS-7122
> Project: Mesos
> Issue Type: Bug
> Components: libprocess
> Reporter: James Peach
>
> In a test environment, we saw that libprocess can deadlock when the process
> reaper is unable to run.
> This happens in the Mesos HDFS client, which synchronously runs a {{hadoop}}
> subprocess. If this happens too many times, the {{ReaperProcess}} is never
> scheduled to reap the subprocess statuses. Since the HDFS {{Future}} never
> completes, we deadlock with all the threads in the call stack below. If there
> was a dedicated thread for the {{ReaperProcess}} to run on, or some other way
> to endure that is is scheduled we could avoid the deadlock.
> {noformat}
> #0 0x00007f67b6ffc68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1 0x00007f67b6da12fc in
> std::condition_variable::wait(std::unique_lock<std::mutex>&) () from
> /usr/lib64/libstdc++.so.6
> #2 0x00007f67b8b864f6 in process::ProcessManager::wait(process::UPID const&)
> () from /usr/lib64/libmesos-1.2.0.so
> #3 0x00007f67b8b8d347 in process::wait(process::UPID const&, Duration
> const&) () from /usr/lib64/libmesos-1.2.0.so
> #4 0x00007f67b8b51a85 in process::Latch::await(Duration const&) () from
> /usr/lib64/libmesos-1.2.0.so
> #5 0x00007f67b834fc9f in process::Future<Bytes>::await(Duration const&)
> const () from /usr/lib64/libmesos-1.2.0.so
> #6 0x00007f67b833d700 in
> mesos::internal::slave::fetchSize(std::basic_string<char,
> std::char_traits<char>, std::allocator<char> > const&,
> Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> >
> > const&) () from /usr/lib64/libmesos-1.2.0.so
> #7 0x00007f67b833df5e in
> std::result_of<mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID
> const&, mesos::CommandInfo const&, std::basic_string<char,
> std::char_traits<char>, std::allocator<char> > const&,
> Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> >
> > const&, mesos::SlaveID const&, mesos::internal::slave::Flags
> const&)::{lambda()#2} ()()>::type
> process::AsyncExecutorProcess::execute<mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID
> const&, mesos::CommandInfo const&, std::basic_string<char,
> std::char_traits<char>, std::allocator<char> > const&,
> Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> >
> > const&, mesos::SlaveID const&, mesos::internal::slave::Flags
> const&)::{lambda()#2}>(std::result_of const&,
> boost::disable_if<std::result_of
> const&::is_void<std::result_of<mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID
> const&, mesos::CommandInfo const&, std::basic_string<char,
> std::char_traits<char>, std::allocator<char> > const&,
> Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> >
> > const&, mesos::SlaveID const&, mesos::internal::slave::Flags
> const&)::{lambda()#2} ()()> >, void>::type*) () from
> /usr/lib64/libmesos-1.2.0.so
> #8 0x00007f67b833a3d5 in std::_Function_handler<void
> ()(process::ProcessBase*), process::Future<Try<Bytes, Error> >
> process::dispatch<Try<Bytes, Error>, process::AsyncExecutorProcess,
> mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID const&,
> mesos::CommandInfo const&, std::basic_string<char, std::char_traits<char>,
> std::allocator<char> > const&, Option<std::basic_string<char,
> std::char_traits<char>, std::allocator<char> > > const&, mesos::SlaveID
> const&, mesos::internal::slave::Flags const&)::{lambda()#2} const&, void*,
> {lambda()#2},
> mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID const&,
> mesos::CommandInfo const&, std::basic_string<char, std::char_traits<char>,
> std::allocator<char> > const&, Option<std::basic_string<char,
> std::char_traits<char>, std::allocator<char> > > const&, mesos::SlaveID
> const&, mesos::internal::slave::Flags const&)::{lambda()#2}
> const&>(process::PID<process::AsyncExecutorProcess> const&, process::Future
> (process::PID::*)(mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID
> const&, mesos::CommandInfo const&, std::basic_string<char,
> std::char_traits<char>, std::allocator<char> > const&,
> Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> >
> > const&, mesos::SlaveID const&, mesos::internal::slave::Flags
> const&)::{lambda()#2} const&, void*), {lambda()#2},
> mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID const&,
> mesos::CommandInfo const&, std::basic_string<char, std::char_traits<char>,
> std::allocator<char> > const&, Option<std::basic_string<char,
> std::char_traits<char>, std::allocator<char> > > const&, mesos::SlaveID
> const&, mesos::internal::slave::Flags const&)::{lambda()#2}
> const&)::{lambda(process::ProcessBase*)#1}>::_M_invoke(std::_Any_data const&,
> process::ProcessBase*) () from /usr/lib64/libmesos-1.2.0.so
> #9 0x00007f67b8b85ede in
> process::ProcessManager::resume(process::ProcessBase*) () from
> /usr/lib64/libmesos-1.2.0.so
> #10 0x00007f67b8b8fc8f in
> std::thread::_Impl<std::_Bind_simple<process::ProcessManager::init_threads()::{unnamed
> type#1} ()()> >::_M_run() () from /usr/lib64/libmesos-1.2.0.so
> #11 0x00007f67b6da1470 in ?? () from /usr/lib64/libstdc++.so.6
> #12 0x00007f67b6ff8aa1 in start_thread () from /lib64/libpthread.so.0
> #13 0x00007f67b6a3faad in clone () from /lib64/libc.so.6
> {noformat}
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