Log fatal error if plasma manager or local scheduler heartbeats take too long. (#676)

* Log fatal error if plasma manager or local scheduler take too long to send heartbeat.

* Fix linting.

* Use int64_t for milliseconds since unix epoch.

src/common/CMakeLists.txt

@@ -79,7 +79,7 @@ function(define_test test_name library)
   add_executable(${test_name} test/${test_name}.cc ${ARGN})
   add_dependencies(${test_name} hiredis flatbuffers_ep)
   target_link_libraries(${test_name} common ${FLATBUFFERS_STATIC_LIB} ${library})
-  target_compile_options(${test_name} PUBLIC "-DPLASMA_TEST -DLOCAL_SCHEDULER_TEST -DCOMMON_TEST -DRAY_COMMON_LOG_LEVEL=4 -DRAY_TIMEOUT=50")
+  target_compile_options(${test_name} PUBLIC "-DPLASMA_TEST -DLOCAL_SCHEDULER_TEST -DCOMMON_TEST -DRAY_COMMON_LOG_LEVEL=4")
 endfunction()
 
 define_test(common_tests "")

src/common/common.cc

@@ -1,5 +1,6 @@
 #include "common.h"
 
+#include <chrono>
 #include <stdio.h>
 #include <unistd.h>
 #include <sys/types.h>
@@ -65,3 +66,10 @@ char *ObjectID_to_string(ObjectID obj_id, char *id_string, int id_length) {
 
   return id_string;
 }
+
+int64_t current_time_ms() {
+  std::chrono::milliseconds ms_since_epoch =
+      std::chrono::duration_cast<std::chrono::milliseconds>(
+          std::chrono::system_clock::now().time_since_epoch());
+  return ms_since_epoch.count();
+}

src/common/common.h

@@ -232,4 +232,11 @@ bool DBClientID_equal(DBClientID first_id, DBClientID second_id);
 
 extern const unsigned char NIL_DIGEST[DIGEST_SIZE];
 
+/**
+ * Return the current time in milliseconds since the Unix epoch.
+ *
+ * @return The number of milliseconds since the Unix epoch.
+ */
+int64_t current_time_ms();
+
 #endif